THE FEDERAL JUDICIARY Essay Example | Topics and Well Written Essays - 250 words

THE FEDERAL JUDICIARY - Essay Example The two lawyer had another had another case challenging the Affordable Care Act, but the rule ruled in favor of the Obama administration with a vote of 5 to 4 vote (Liptak). Clement argue that the Affordable Care Act requires a majority of employers to provide female employees with comprehensive cover for varieties of contraception methods available in the market. However, under the Affordable Health Act, small employers and religious employers are exempted from covering their employees on contraception (U.S Department of Health and Human Services). Moreover, religious affiliated organizations or group do not need provide their workers with contraceptive cover. The plaintiff told the bench that including insurance coverage for contraceptives promotes equality in the health care provision and ensure that women has access to quality birth control methods. Moreover, offering comprehensive contraceptive insurance ensure that women would be able to prepare for their family until when they are ready to have children (Liptak). Liptak, Adam. "Supre Court Hears Cases on Contraception Rule." 25 March 2014. The New York Times. 17 April 2014 . U.S Department of Health and Human Services. 17 April 2014. 18 April 2014

Banyan Tree Case Study Essay Example | Topics and Well Written Essays - 2250 words

Banyan Tree Case Study - Essay Example That said, these factors are important, but the main factor which contributes to Banyan Tree's success is the way that they treat their employees. Banyan Tree allows its employees to vary service delivery according to the local customs and practices, and this gives the employees investment and ownership in the company. The same goes for the fact that employees are able to be creative with bed decoration. Staff welfare is paramount to the company – they provide luxurious amenities, as well as prosaic, but necessary, amenities, such as child care facilities. Therefore, the employees have ownership, in that they really care about the facilities. This fits in with the concept of shared vision. A shared vision is one in which the leader, and all the followers, have the same vision for the company. Every person cares about this vision, and everybody has the desire to carry out this vision. Every member of the organization has the same vision, therefore will be truly committed to mak e the vision happen (Senge, 1990, p. 206). What Banyan Tree is doing right is that it has created the shared vision by acknowledging the strengths of the employees. This acknowledgment of each individual member is a powerful factor in creating a shared vision. Having a shared vision enables the employees to know that they own a piece of this vision, and that they are a part of the vision (Senge, 1990, p. 212). ... After all, a resort with all the amenities possible, but a disengaged and disinterested staff will ruin this resort. 2. Can Banyan Tree maintain its unique positioning in an increasingly overcrowded resort market? The communication strategy and brand positioning for the company focuses around high end clientele. They offer luxurious amenities, such as private pools, jacuzzi and spa treatment rooms. Their villas are individualized to the clientele. Their accommodations are private and intimate, which sets them apart from their rivals, who do not offer the same accommodations. Moreover, they are unique in that they emphasize their environmentally friendly designs. They are socially responsible in everything they do, from procurement to hiring natives for their positions. As for their marketing, they advertise in high-end travel magazines and cultivated relationships with travel editors and writers. They have also chosen to work with only agents which specialize in high-end travel arran gement with wealthy customers. Banyan Tree can maintain its brand and its positioning, because they are apparently the only resort which has the amenities which are offered there. For instance, they have total privacy for their guests. Guests may skinny dip in their private pool and hot tubs if they want to, because it is totally private and secluded. They emphasize this in their marketing materials, so this is a big plus and it sets them apart from their competitors. Wirtz (2009) states that the competitors in the market, Hilton and Shangri-La, do not offer the same privacy that Banyan offers. Moreover, as indicated in other areas of this essay, Banyan is unique in that it gives ownership to its employees, in

Understanding the business of fashion Essay Example | Topics and Well Written Essays - 1250 words

Understanding the business of fashion - Essay Example Understanding the business of fashion Heading into 2012, retaliating industries will face a greater challenge. Many retailers are using the concept of Internet retailing to increase purchasing power. For most of human history, clothes were handmade, often by the woman of the household, or by female servants. Those who could afford nice material and expensive designs typically indulged those desires; however, most individuals did not put much consideration into their wardrobe. The emergence of a middle class in Europe and the United States made it possible for people to take more of an interest in how they presented themselves in clothes, and patterns of popular clothes were introduced for people to copy. With the industrial revolution, it became possible for clothes to be mass?produced, but there was still a desire among many individuals to have clothes that were considered fashionable and even unique in an era when mass production was increasingly the norm. Today, with advanced technologies, manufacturers are able to of fer mass customization in fashion. Haute couture, which continues to be regulated in France, often sets the design guidelines for a particular season. Major couture houses, including Christian Lacroix, use their haute couture not only for its own sake, but also to promote ready-to-wear designs, as well. In addition, many major design houses today sell multiple brands and also multiple product lines, so that a haute couture show may also be a showcase for perfume and accessories. (Waddell 21). Competitors of Haute Culture include major retailers like the Gap, which sells clothes worldwide, and Avicsar, CatWalk Enterprises, and First Impressions. All of these companies are European based and First Impressions is situated in London. All of these companies are showing the same trends—a decrease in sales relevant to the decrease in economic status. Therefore, heading into 2012, all companies are going to need to consider new ways of selling, and the Internet could certainly open up many avenues for them. Out of the companies listed above, Gap is currently most prevalent on the Internet, and this may be the reason they are performing better than the other companies, although economic issues have hurt them. The fashion industry is a global industry (Movius n.p.). Textiles may be produced in a country such as Thailand and transported to a low-cost labor market such as China to manufacture designs that were created in Europe or the United States for sale in r etailers around the world. This globalization works to keep costs low on the manufacturing side, which increases the normal profit. However, not all of the companies listed above work in this global context, Gap again being the only one listed that does. The use of outsourcing may be a consideration for these other companies in order to increase sales. At the same time, the various fashion collections and their shows can increase demand for a particular designer's goods. As designers become better-known, customers may be willing to pay more in order to have the distinction of owning a piece by that particular designer. In this way, the price of high fashion can be driven up not by value-added, but by customer valuation of a particular brand. While some might argue that this does, indeed, constitute value-added from a marketing standpoint in the sense that branding adds value, others would suggest that this is an artificial component that does not have intrinsic economic

Philosophies of Religion Essay Example for Free

Philosophies of Religion Essay This Essay portrays the basic philosophies of religion particularly Christianity. This will be helpful for Christians to refresh or enhance their faith or take the challenge in strengthening their beliefs. Among the important and basic Christian philosophies to be discussed include; the true religion, real and false churches, minds and soul, heaven and heal, life after death, love and forgiveness, perfect marriage, miracles, Trinity, the challenging questions about the Da Vinci Code, Christians and Muslims, perfect marriage, etc. The discussions presented in this article are focused on indepth reflections of my previous work entitled, Echoes of Heaven: Gods Love is Better than Life Itself. This further simplify the understanding of mysterious things concerning Christian faith and the challenges that shaken or strengthen the beliefs of a Christian. Introduction Many people (Christians and non-Christians) are in a great religious confusion with tough questions about faith, life, death and many other challenging concerns that will most likely affect the faith or belief of the people. Most are searching for answers through reading literatures, the holy bible or the Koran, discussions with peers, religious institutions, and even through prayers. This essay will attempt to offer explanations of the many questions that challenge the beliefs of Christians and non-Christians. Some inputs of this essay are generated from my article, â€Å"Echoes of Heaven: Gods Love is Better than Life Itself† that aim to enhance man’s relation with God. What is Soul? Soul is the energy that God places within a human body so it would receive life. It is in the form of spirit which is invisible to human eyes. It does not reside in one part of the body but keeps on moving throughout the blood. It can leave the body, go to another place or world, and come back into it as long as it remains connected. It happens so fast because it can move at the speed of light. It has the ability to travel into the future and tell how the future will be, that is a vision. Soul gives light and lives in the body and also prevents the body from decaying, and once the soul is unconscious or leaves the body, the body has no life, and therefore it starts decaying. The soul is the body’s life giving spiritual thing which is separate and distinct from the body. They are inseparable in any way when the body is conscious, but the soul could be away from the body when the latter is unconscious. How do minds and soul communicate? Soul has no language barriers. There is only one language understood by all souls, or perhaps the soul has the ability to understand all languages. It has unlimited power and the ability to perform anything. When God created man, He granted this power and authority where the soul operates in human flesh in which the latter is ruled by a human mind. Human minds are limited in terms of power, their ability to perform, language, and mobility, among other things. Mind’s desire is for material or physical things while the soul desires for the things that are spiritual. The soul has the ability to see beyond what the naked eye cannot see and has the ability to gather information from different places in an instant. It is stated that even the absence of language, the soul still communicate with mind in harmony. Soul is therefore, considered as master over mind. A gap is identified between the human level and the spiritual level where either the spirit of God resides or the spirit of the Devil. The soul provides information to the mind. The spirit of God empowers the soul to act at its fullness, but the evil spirit empowers the mind or the flesh. The mind has the ability to process and store information or idea communicated from the soul which can be destructive or creative, depending on its source. What is a true religion? A true religion is the one that follow God’s guidance by building a good relationship with God. God is interested in having a good relationship with people; this is the true religion, knowing what God wants and knowing that we are doing what pleases Him. Likewise, the ISLAM HERALD (2003) stated that a true religion is teaching true concepts like the existence of God, that He is powerful and loving, He is aware of us and wishes to help us, and that certain things are required of us in return. It is therefore imperative that everyone should think that religion is just a vehicle to let people know that there is God and that He wants all the people to follow what He wants. Hence, the issue on true religion should not be argued. People who argue and claim that their religion is the true religion are those who did not follow what God wants them to do, hence, they are fools influenced by the thoughts of the devil. What is death, and how do people feel when dying? Death is the state when the soul has completely left the body and has no connection, or the soul is still in the body but unconscious. When a person meets an accident, the flesh may completely fail to function but the soul is fully conscious, preoccupied with many things, without expecting in meeting death. In this situation, the death of accident victim is declared but remains fully conscious within the body in which souls are looking for mercy, and they can talk. However, after some days, the soul gives up and became unconscious because they can no longer gain strength. What happens when one dies? When some people die, their souls remain unconscious within their bodies; others get out of their body and begin roaming around while the holy ones go to paradise, led by angels. The death of the holy ones will open the gate to a bright world where the angels are waiting to take them home (paradise), but those who remain in the grave are surrounded by darkness; they are not warm or cold. The latter’s case will be determined during the Day of Judgment. The rebellious ones still go on roaming the world and their souls are fully dedicated to the Devil. Are heaven and hell real? The Holy Bible tells everyone that there is heaven and hell. This contention can be read in some passages of the Bible, and among them are the book of Revelation and the gospel of Mathew which can be read below. Heaven Revelation 21:1-4 reads: Now I saw a new heaven and a new earth, for the first heaven and the first earth had passed away. Also there was no more sea. Then I, John, saw the holy city, New Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. And I heard a loud voice from heaven saying, Behold, the tabernacle of God is with men, and He will dwell with them, and they shall be His people. Hell Jesus used different images to describe hell. He used the images of torment (Matthew 25:46), a place of weeping and gnashing of teeth (Matthew 8:12), a place of outer darkness (Matthew 8:12), and a place of fire (Matthew 3:12). Revelation 21:8 describes it as the lake which burns with fire and brimstone To demonstrate that hell is a place of continual and eternal torment, Revelation 14:11 states that â€Å"the smoke of their torment ascends forever and ever; and they have no rest day or night, who worships the beast and his image, and whoever receives the mark of his name. This is the biblical teaching on hell. Those who try to dilute it are only hurting people; hell is real, and everyone who does not submit to the gospel of Christ will go there. However, Rev. Douglas Taylor of the Unitarian Universalist Congregation of Binghamton, argue that Hell, like Heaven, is essentially a state of mind although the very opposite state of mind to heaven. If hell is within us, it will be seen outside of us as a place (a hideous place), ref lecting the hideousness of the evil within†. Is there life after death? Yes, there is life after death. This is supported by the Bible’s passage particularly in John 11:25-26 where God said â€Å"There is only one way – through faith and trust in Gods Son, Jesus Christ. Jesus said, â€Å"I am the resurrection and the life. Those who believe in me, even though they die like everyone else, will live again. They are given eternal life for believing in me and will never perish. Furthermore, this can also be read in the book of Mathew 25:46 which states that â€Å"Those who have been made righteous will go into eternal life in heaven, but unbelievers will be sent to eternal punishment or hell†. Who is right, Christians or Muslims? Christians and Muslims believe in the same God, and their faith is based on the Old Testament. These believers are both believe in the Day of Judgment and the coming of Jesus Christ for the second time. Many are amazed that the Koran talked more about Mary, the mother of Jesus, in regards to the birth of Christ than the Bible itself. Both groups of believers believe in the living God, the Most High King, and the God of the universe. At that high level, both groups have no difference. Those who called by His name are given the power and authority to rule and judge the world. God was just using different messengers for the Christians and the Muslims; Christ Jesus for the Christians, and Mohammad for the Muslims. But, they the same believed the old testament of the Holy Bible. In the eyes of God, the righteous are those who believe that there is God; obey His commands, and those who recognize that He is the most powerful and merciful God. What is a perfect marriage? A perfect marriage is a marriage that put God in the center. A perfect marriage is bound with open communication, faith and trust with each other. In Ephesians 5:23-33 of the Holy Bible, God describes that perfect marriage is based on love. He commands the husband to love his wife more than he loves himself, and to nourish and cherish her. A man should provide for his wife’s needs and consider her a precious possession. The most important part of a good marriage is LOVE, not just a physical attraction, but true love and concern for each other before God. Marriages that last are built on love (Ecclesiastes 9:9). The wise man Solomon said that enjoying life’s blessings with a loving companion is a great reward. Love’s endurance knows no limits, its trust no end, its hope no fading; it can outlast anything. If, we will but follow Gods pattern for the marriage relationship, we can find the happiness that God intended when He ordained it. The pleasure and happiness are there when the husband and the wife have the proper love for each other and for God. These explanations about perfect marriage are anchored on LOVE. What is the secret behind miracles? The secret behind miracles is faith. Many scriptures in the Holy Bible (in the New Testament) tell how Jesus shown that faith makes miracles. However, in some cases, miracles are used by the devil to mislead the people of God and forget the true miracle from God which is the miracle of forgiveness of sins. Do all miracles come from God? Not all miracles come from God. Dan Corner of Evangelical Outreach reveals that miracles come from two sources that is God and devil. The book of Exodus that â€Å"some of Gods miracles were duplicated by Satans power channeled through the Egyptian magicians: a wooden staff became a snake† (7:10, 11); â€Å"water was changed into blood† (7:20-22)† and frogs came out of the water and covered the land† (8:6, 7)! † Demons can and do perform miraculous signs† (Rev. 16:14, p. 142). In the Holy Bible (New Testament) Jesus Christ made many miracles of healing the sick people, giving life again to the declared dead person, calming storms, etc. All the miracles performed by Jesus came from God. Are all churches real? Not all churches are real. Elephant shared in his article that the real churches are those where the worshippers are singing with the same voice, moving in the same direction, without confusion, and seek God for salvation. Real churches are those with true worshippers. True worshippers of God are poor in hearts seeking God and left everything behind just to follow God with one purpose, salvation. Is there any false church or prophet? There are so many false churches and prophets even during the time of Jesus Christ. False church is look like a market place where there are lots of confusions; people are seeking God for material things not salvation. Yes, there were false prophets as supported by Ezekiel 13, even God warn the people against false prophets and said to Ezekiel â€Å"These foolish prophets are doomed! They provide their own inspiration and invent their own visions. Christians of today, your prophets are as useless as foxes living among the ruins of the city. They do not guard the places where the walls have crumbled, nor do they build the walls, and so the churches cannot be defended when war comes on the day of the Lord. Their visions are false, and their predictions are lies. They claim that they are speaking my message, but I have not sent them. Yet they expect their words to come true! I tell them: Those visions you see are false, and the predictions you make are lies. You say that they are my words, but I have not spoken to you†. Jeremiah was told by God to â€Å"Tell my people not to listen to what those false prophets say; they are filling you with false hopes. They tell you what they have imagined and not what I have said. To the people who refuse to listen to what I have said, they keep saying that all will go well with them. And they tell everyone who is stubborn that disaster will never touch him. † Is man a complicated creature? Why and why not? Man is a complicated creature because God has provided them everything, the life, the trees that produces foods they need. In Genesis 2:15-16, God even give man a companion in the presence of Eve. With a condition that he should not eat the fruit of the tree that gives knowledge of what is good and bad because the punishment of death will be accorded to him by God. Man’s complication started when he disobey God. The complication continue when God give different languages to human beings and scattered them all over the world. It is hard to understand man because something else that God had no intention to create was created after eating the fruit of the tree that gives knowledge of what is good and what is bad. Man became a complicated creature and that is why we suffer, because we need to prove to God that we can be faithful and trusted once more. Our first parent chose to follow or listen to a stranger, the devil. He ignored the instruction of God, despite or everything provided to him by God.

families Essay -- essays research papers

The importance of families has been espoused by all since the inception of modern times. Considered by most to be the backbone of America, it is how we socially and culturally indoctrinate our offspring so they are able to become a functional member of society. A lack of a full family is often cited as the reason that children end up as criminals or delinquents. The notion of family being the birthplace of problems is not even something most people could find feasible, which is what makes Barbara Ehrenreicht’s essay â€Å"Are Families Dangerous?† seem a bit out in left field to most readers. But upon closer inspection and reflection into ones own family life, and the lives of those around them, Ehrenreicht’s essay begins to make a lot more sense. It is because of my understanding of values within our culture and my own personal experience with my family that I believe Ehrenreicht’s essay on family is completely true in the ideas that it expresses. Most of us choose only to recall fond memories of our youth when we speak about how great family life is, though the reality of things is that few of us have a perfect youth with our family and it is often peppered with emotional and physical harm. Ehrenreicht hits the nail on the head when she talks about the plight of the wife, many of their problems come not from outside of the house, but within. Turn to any daytime TV show to see the crying and emotional pain that family members cause, whether it be from physical or emotional abuse....

Comparison of two car advertisements

In this essay I plan to compare two car advertisements. One of which is about a large car, the other, a small car. In a year millions of pounds are spent on advertising so from that it is easy to accept that a car advertisement will cost a lot of money. Advertisement 1 has a frame of a Volkswagen Boulevard, facing towards the reader with three stereotypical cleaning ladies draped over the car in a humours fashion. The copy is presented below the frame with a slogan that uses both humour and rhyme. The frame does not let you see the back of the car, and the copy uses a range of print sizes. The print contains twelve short paragraphs. The advert is from the Sunday Times, which is a respectable broadsheet newspaper; the advert takes up a whole page, which is an A3 sized piece of paper. Advertisement 2 shows a large blue Volvo Estast in the countryside, surrounded by rocks grass and trees. A woman and a man are standing behind the car unpacking or packing a hiking kit. The car is shown from the back with the boot open. The rocks and the scenery are presented like this to show that the car can be used on other landscapes; the colour of the car also blends in with the scenery, as it is a natural blue. The rocks suggest that the car is rugged, strong, and long lasting, which gives a positive view towards the Volvo. The alloy wheels give it a sporty viewpoint, which is backed up with the copy â€Å"performance cars†. Volvo's are well known for their safety and this is also subconsciously shown by the red lights on the back of the car, the helmet and all the other hiking equipment that is used for safety, like the ropes. The man acts as if he owns the car, he stands at the back dominantly as he stands he seems to be taking charge, he is closer to the car from this point you can see that the advert is obviously aimed towards the male audience. The boot of the car is open to show that there is lots of space, the amount of space is also shown by the angle the frame is shown at this can make the car look bigger than it actually is. Advertisement 1 obviously has women as its target audience as they have not used glamorous women over the cars and have not gone into great detail in describing the more technical features of the car. The advertisement captures the consumers attention through the amount of space the advert takes up, only approximately one third of the page is actually taken up by the car. There is a lot of empty space around the car, and because the car is being sold as a small car the visuals represent it. Throughout the advert it stresses the point that the car is small and compact. An example of this is in the copy with â€Å"quite a little number† little being the buzzword. The advert shows individualism. â€Å"Draping models over our cars has never been our style. This advertisement is also targeted towards first time buyers as it repeats â€Å"special edition† twice and it has minor details on price in the fine print under the normal print. In conclusion both adverts are aimed towards a rather different audience but both seem affective in what they have set out to do. Advertisement 1 tells of the car being small and compact and shows it many ways, whilst advert 2 tells and shows of the car being large and sports like and shows it using more frames then print. I could see a lot of people reading these adverts and wanting to buy the cars. There fourth I think that both advertisement companies do well in what they have set out to do.

Mini Project

CONTENTS 1| ABSTRACT| | 2| ABBREVIATION| | 3| INTRODUCTION TO NC AND CNC| 4| 4| HISTORY| 7| 5| CNC SYSTEM ELEMENTS| 10| 6| WORING ON CNC MACHINES| | 7| BASIC CONCEPTS OF PART PROGRAMMING| 16| 8| TYPES OF CNC MACHINES| 18| 9| PROPERTIES OF CNC MACHINES| 20| 10| DRILLING AND TAPPING ON CNC| 35| 11| APPLICATIONS OF CNC MACHINES| 49| 12| ADVANTAGES AND DISADVANTAGES OF CNC| 51| 13| CONCLUSION| 52| LIST OF FIGURES PAGE NO 1| Hydrotel Milling Machine| 5| 2| Chiron CNC Machine| 5| 3| CNC Lathe Machine| 6| | CNC elements block diagram| 10 | 5| Point to Point tool path| 11| 6| Contour Tool Path| 12| 7| Continuous path tool movements| 18| 8| Continuous path controllers| 19| 9 | Schematic Illustrations of components(a)An open loop(b)A closed loop control| 19| 10| CNC Lathe| 21| 11| CNC Grinders| 21| 12| CNC Drilling| 22| 13| CNC Boring machine| 22| 14| Electrical Discharge Machines (EDM)| 23| 15| Laser cutting machine tools| 23| 16| Flat bed CNC Lathe| 25| 7| Slant bed CNC Lathe| 25| 18| CNC To ol Turrent| 26| | | | | | | | | | | | | 28| Different tools in Drilling machines| 26| 20| Tool Holders| 27| 21| CNC with Fanuc control| 28| 22| CNC setter| 29| 23| Override Speed setter| 31| 24| CNC Backlash| 32| 25| Sensitive Drilling machine| 37| 26| Radial drilling machine| 38| 27| Up-right Drilling machine| 38| 28| Drill materials| 39| 29| Tool nomenclature| 40| 30| Tool holding devices| 41| 31| Various operations of drilling machines| 42| 32| Counter Boring| 43| 33| Counter sunk| 43| 34| Spot Facing| 43| 35| Hands Taps| 46| 36| Holding Devices| 48| 7| Types of Clamps and C- Clamps| 49| 38| Products used in Aerospace Industry| 49| 39| 5 Axis CNC Milling machine| 50| 3. INTRODUCTION TO NC AND CNC Numerical control  (NC) refers to the  automation  of  machine tools  that are operated by programmed commands encoded on a storage medium, controlled manually via hand wheels or levers, or mechanically automated via cams alone. The first NC machines were built in the 1940s and 1950s. These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern  computer numerical control  (CNC) machine tools that have revolutionized the  machining  processes.The program is translated into the appropriate electrical signals for input to motors that run the machine. A CNC machine is an numerical control machine with the added feature of an on board computer. The computer is referred to as the machine control unit (MCU). In modern CNC systems, component design is highly automated using  computer-aided design  (CAD) and  computer-aided manufacturing (CAM) programs. The programs produce a computer file that extracts the commands needed to operate a particular machine, and then loaded into the CNC machines for production.Since any component might require the use of a number of different tools-drills, saws, etc. , modern machines often combine multiple tools into a single â€Å"cell†. The Evolution of NC It was i n 1947 when numerical control was born. It began when John C. Parsons of the Parsons Corporation, Traverse City, Michigan, a manufacturer of helicopter rotor blades, could not make his templates fast enough. So, he invented a way of coupling computer equipment with a jig borer. Mr. Parsons used punched cards to operate his digit Ron system. 1949 was the year of another â€Å"Urgent need†. The U. S.Air Material command realized that parts for its planes and missiles were becoming more complex. Also, as the designs were constantly being improved, changes in the drawing were frequently made. Thus, in their search for methods of faster production, an Air Force study contract was awarded to the Parsons Corporation. The servo mechanisms laboratory of the Massachusetts Institute of Technology (MIT) was the subcontractor. In 1951, MIT took over the complete job, and in 1952, the prototype of today’s NC machine, a modified Cincinnati Hydrotel Milling Machine, was successfully d emonstrated.The numerical control was originated at MIT. Fig:1 Fig:2 CNC MACHINES CNC stands for Computer Numerically Controlled. CNC refers to how a machine operates, that is, its basic method of controlling movement, e. g. , a CNC machine uses a stream of digital information (code) from a computer to move motors and other positioning systems in order to guide a spindle or other tooling over raw material. A CNC machine uses mathematics and coordinate systems to understand and process information about what to move, to where, and how fast.Most CNC machines are able to move in three controlled directions at once. These directions are called axes and are given simple names such as X, Y and Z (based on the Cartesian Co-ordinate System). The X axis is always the longest distance a machine or a part of a machine must travel. X may be the movement from front to back, Y the movement from left to right, and the Z is almost always vertical movement (normally the spindle’s positioning movement up and down). Superior Machinery sells many types of CNC Machines, from CNC Horizontals, CNC Verticals to CNC Lathes; they have over 182 CNC Machines to choose from.A CNC machine must be able to communicate with itself to operate. A computer numeric control unit sends position commands to motors. The motors must talk back to the control that, indeed, they have acted correctly to move the machine a given distance. The ability of CNC machines to move in three (or more) directions at once allows them to create almost any desired pattern or shape. All of this processing happens very fast, accurately and consistently. 4. HISTORY Fig:3 In 1775, John Wilkinson- cannon boring machine (lathe). In 1881, Eli Whitney- milling machine. In 1947, Mr.John Parsons began experimenting for using 3-axis curvature data to control the machine tool motion for the production for aircraft components. In 1949, parsons- first NC machine. In 1951, MIT was involved in the project. In 1955, after refine ments NC became available in industry . Today, modern machineries are CNC milling machines and lathes. CNC technology was developed in the United States in the 1950? s for the US Air Force by metalworking machine tool builders. It was a major advance in the ability of machines to faithfully reproduce complex part machining steps more accurately without human intervention or variability.Numerical control (NC) refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium, as opposed to manually controlled via handwheels or levers, or mechanically automated via cams alone. The first NC machines were built in the 1940s and 1950s, based on existing tools that were modified with motors that moved the controls to follow points fed into the system on punched tape. These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern computer numerical control (CNC) machine tools that have revolut ionized the machining processes.In modern CNC systems, end-to-end component design is highly automated using computer-aided design (CAD) and computer-aided manufacturing (CAM) programs. The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine via a postprocessor, and then loaded into the CNC machines for production. Since any particular component might require the use of a number of different tools-drills, saws, etc. , modern machines often combine multiple tools into a single â€Å"cell†.In other cases, a number of different machines are used with an external controller and human or robotic operators that move the component from machine to machine. In either case, the complex series of steps needed to produce any part is highly automated and produces a part that closely matches the original CAD design. Proliferation of CNC The price of computer cycles fell drastically during the 1960s with the widespread introduc tion of useful minicomputers. Eventually it became less expensive to handle the motor control and feedback with a computer program than it was with dedicated servo systems.Small computers were dedicated to a single mill, placing the entire process in a small box. PDP-8? s and Data General Nova computers were common in these roles. The introduction of the microprocessor in the 1970s further reduced the cost of implementation, and today almost all CNC machines use some form of microprocessor to handle all operations. The introduction of lower-cost CNC machines radically changed the manufacturing industry. Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number f machining steps that required human action have been dramatically reduced. With the increased automation of manufacturing processes with CNC machining, considerable improvements in consistency and quality have been achieved with no strain on the operator. CNC automatio n reduced the frequency of errors and provided CNC operators with time to perform additional tasks. CNC automation also allows for more flexibility in the way parts are held in the manufacturing process and the time required to change the machine to produce different components.During the early 1970s the Western economies were mired in slow economic growth and rising employment costs, and NC machines started to become more attractive. The major U. S. vendors were slow to respond to the demand for machines suitable for lower-cost NC systems, and into this void stepped the Germans. In 1979, sales of German machines surpassed the U. S. designs for the first time. This cycle quickly repeated itself, and by 1980 Japan had taken a leadership position, U. S. sales dropping all the time. Once sitting in the #1 position in terms of sales on a top-ten chart consisting entirely of U. S. ompanies in 1971, by 1987 Cincinnati Milacron was in 8th place on a chart heavily dominated by Japanese firm s. Many researchers have commented that the U. S. focus on high-end applications left them in an uncompetitive situation when the economic downturn in the early 1970s led to greatly increased demand for low-cost NC systems. Unlike the U. S. companies, who had focused on the highly profitable aerospace market, German and Japanese manufacturers targeted lower-profit segments from the start and were able to enter the low-cost markets much more easily. As computing and networking evolved, so did direct numerical control (DNC).Its long-term coexistence with less networked variants of NC and CNC is explained by the fact that individual firms tend to stick with whatever is profitable and their time and money for trying out alternatives is limited. This explains why machine tool models and tape storage media persist in grandfathered fashion even as the state of the art advances. 5. CNC SYSTEM ELEMENTS A typical CNC system consists of the following six elements. 1 Part program 2 Program inpu t device 3 Machine control unit 4 Drive system 5 Machine tool 6 Feedback system Fig:4 6. WORKING OF CNC MACHINES:CNC machines are Controlled by G and M codes. These are number values and co-ordinates. Each number or code is assigned to a particular operation. Typed in manually to CAD by machine operators. G&M codes are automatically generated by the computer software. The tool or material moves. Tools can operate in 1-5 axes. Larger machines have a machine control unit (MCU) which manages operations. Movement is controlled by a motor (actuators). Feedback is provided by sensors (transducers) Closed loop. Tool magazines are used to change tools automatically. Tool Paths and Cutting   Motions:Tool paths describe the route the cutting tool takes. Motion can be described as point to point, or contouring. Speeds are the rate at which the tool operates e. g. rpm. Feeds are the rate at which the cutting tool and work piece move in relation to each other. Expressed in IPM (inches per minu te) Feeds and speeds are determined by cutting depth, material and quality of finish needed. e. g . harder materials need slower feeds and speeds. Rouging cuts remove larger amounts of material than finishing cuts. Rapid traversing allows the tool or work piece to move rapidly when no machining is taking place.Fig:6 Point to Point Tool path Fig:5Contour ToolPath 1. Point to Point tool paths cut following lines 2. Contour tool paths cut follow surfaces Linear Interpolation: (Point to Point) Linear interpolation consist of a programmed point linked together by straight line Fig:7 Circular Interpolation: (Contour) Circular interpolation is the process of programming arcs and circles. Circular interpolation requires endpoints, a feed rate, a center, a radius, and a direction of movement. Block of Information: When running, a part program is interpreted one command line at a time until all lines are completed.Fig:8 N001 G01 X1. 2345 Y. 06789 MO3 N001:Represents the sequence number of the operation G01: Represents linear operation (tool movement) X12345: Will move the tool or table 1. 2345 in. a positive direction along the X axis Y6789:Will move the tool or table 0. 6789 in. along the Y axis M03:Turns spindle on clockwise Commands, which are also referred to as blocks, are made up of words which each begin with a letter address and end with a numerical value. Each letter address relates to a specific machine function. â€Å"G† and â€Å"M† letter addresses O-Program number (Used for program identification)N-Sequence number (Used for line identification) G-Preparatory function X-X axis designation Y-Y axis designation Z-Z axis designation R-Radius designation F-Feed rate designation S-Spindle speed designation H-Tool length offset designation D-Tool radius offset designation T-Tool Designation M-Miscellaneous function G- CODES (Preparatory Functions) which cause some movement of the machine table or head. G00 – Rapid Movement G01- Linear Interpo lation (movement) G02- Circular Interpolation, CW G03- Circular Interpolation, CCW G17 -XY Plane,G18- XZ Plane,G19 -YZ Plane G20/G70 -Inch unitsG21/G71 -Metric Units G40- Cutter compensation cancel G41 -Cutter compensation right G43- Tool length compensation (plus) G43- Tool length compensation (plus) G44- Tool length compensation (minus) G49-Tool length compensation cancel G80-Cancel canned cycles G81-Drilling cycle G82-Counter boring cycle G83-Deep hole drilling cycle G90-Absolute positioning G91- Incremental positioning M-CODES (Miscellaneous) which turn ON or OFF different functions M00 -Program stop M01 -Optional program stop M02 -Program end M03- Spindle on clockwise M04 -Spindle on counterclockwise M05- Spindle stop M06- Tool change . BASIC CONCEPTS OF PART PROGRAMMING Part programming contains geometric data about the part and motion information to move the cutting tool with respect to the worpiece. Basically, the machine receives instructions as a sequence of blocks contain ing commands to set machine parameters; speed, feed and other relevant information. A block is equivalent to a line of codes in a part program. N135 G01 X1. 0 Y1. 0 Z0. 125 T01 F5. 0 These define: N135-Block number G01-G codes X1. 0, Y1. 0, Z0. 125-Coordinates T01-Tool number F5. 0-Special function Programming Methods Automatically Programmed Tools (APT):A text based system in which a programmer defines a series of lines, arcs, and points which define the overall part geometry locations. These features are then used to generate a cutter location (CL) file. Computer Aided Machining (CAM) Systems-Computer Aided Design (CAD) Systems: CAD/CAM systems allow for rapid development and modifying of designs and documentation. The 3D geometric model produced becomes a common element for engineering analysis (FEA), machining process planning (including CNC part programming, documentation (including engineering drawings), quality control, and so on.Drives of CNC machine tool Hydraulic actuator – high power machine tool Stepping motor – small machine due to limited power and torque DC motor – excellent speed regulation, high torque, most widely used. 8. PROPERTIES OF CNC MACHINES Based on Motion Type: Motion control – the heart of CNC: Point-to-Point or Continuous path Based on Control Loops: Open loop or Closed loop Based on Power Supply: Electric or Hydraulic or Pneumatic Based on Positioning System: Incremental or Absolute Point-to-Point Tool Movements: Point-to-point control systems cause the tool to that point only.The tool is not in continuous contact with the part while it is moving. Examples: drilling, reaming, punching, boring and tapping. Fig:9 Continuous-Path Tool Movements : Continuous-path controllers cause the tool to maintain continuous contact with the part as the tool cuts a contour shape. These operations include milling along any lines at any angle, milling Fig:10 Arcs and lathe turning. Loop Systems for Controlling Tool Movem ent: Schematic illustration of the components of (a) an open-loop and (b) a closed-loop control system for a CNC machine. 9. TYPES OF CNC MACHINES * Lathe Machine * Milling Machine Drilling Machine -The bench drill -The pillar drill * Boring Machine * Grinding Machine CNC Mills: These machining centers use computer controls to cut different materials. They are able to translate programs consisting of specific number and letters to move the spindle to various locations and depths. Used to make 3D prototypes, moulds, cutting dies, printing plates and sights. CNC Lathes: They cut metal that is often turning at fast speeds. CNC lathes are able to make fast ,precision cuts using Indexable tools and drills with complicated programs. Normally, they cannot be cut on manual lathes.They often include 12 tool holder sand coolant pumps to cut down on tool wear. Fig:11 CNC Grinders: Grinding metal process uses a coated wheel that slowly removes metal to create a part. Through the years, grinding was done on a manual machine, but with the advent of CNC technology, the grinding process has advanced . Fig:12 CNC DRILLING: Drilling is commonly used for mass production. The drilling machine (drilling press) is used to create or enlarge holes. The bench drill: For drilling holes through raw materials such as wood, plastic and metal The pillar drill: A larger version that stands upright on the floor.As the bench drill, it can be used to drill larger pieces of materials and produce bigger holes. Fig:13 CNC Boring: Process of enlarging an existing hole or internal cylindirical surface. This can be accomplished on a lathe or a machine tool specifically designed for the process, such as a horizontal boring machine. Fig:14 Electrical Discharge Machines (EDM): Wire EDM machines utilize a very thin wire (. 0008 to . 012in. ) as an electrode. The wire is stretched between diamond guides and carbide that conduct current to the wire and cuts the part like a band saw.Material is removed by the erosion caused by a spark that moves horizontally with the wire. Fig:15 Laser Cutting Machines: The machine utilizes an intense beam of focused laser light to cut the part. Material under the beam experiences a rapid rise in temperature and is vaporized. Laser cuts with a minimum of distortion, no mechanical cutting forces. Specific tools to perform different Operations: Fig:16Fig:17 CNC lathe machine tool turret is part of the CNC machine where all tooling is mounted. CNC lathe tool turret has an integral Disk like part (Tool turret disk) on which all the tools are mounted.CNC lathe tool turret is mounted on the x-axis carriage. Fig:18 Slant Bed CNC Lathe / Flat Bed CNC Lathe On some CNC lathe machines x-axis carriage with the tool turret is located behind the spindle (such cnc lathe machines are called  slant bed cnc lathe machines) and on other cnc lathe it is located at the front (as normal lathe machines) such cnc lathe machines are called  flat bed cnc lathe machine. T he below is a Slant Bed CNC Lathe Machine. Fig:19 Fig:20 CNC Lathe Tool Turret Tool Capacity: Tool capacity for cnc lathe machines varies machine to machine.Small CNC lathe machines normally comes with a tool turret capacity of 4 or 8 tools stations. Bigger and  heavy CNC lathe machines tool turrets are big and heavy and accordingly will hold more tools such as 12 or more. Fig:21 Tool Holder: Tool holder is the actual part which fastens   the tool to the cnc lathe tool turret Disk. Tool holder size also depends upon the cnc lathe tool turret size, heavy CNC late machine tool turret comes with with big bore for tool holders such as 50 mm diameter. For the small tool turret this might be 40 mm diameter or, less to suit the tool to hold.Fig:22 CNC Lathe Tool Turret Rotation CNC lathe tool turret rotates with the cnc program commands. Normally a letter â€Å"T† is used to call a tool in the working position. The tool rotation is dependent on cnc lathe machine. Some cnc lathe tool turret rotate in one direction (CW or CCW ). Some cnc lathe tool turret rotates both directions, such tool turret direction is optimized for the nearest tool station. Some cnc lathe give full control over tool call up, you can call by optimized direction or you can call tool by rotating tool turret by CW direction or CCW.Tool Offset in CNC Lathe with Fanuc Control Fig:23 There are variety of cnc machines in the market, and almost every cnc machine in a  cnc workshop  has different kind of cnc machine controls if controls are not different they might have different versions of the same cnc machine control. As the operating of different cnc machines controls is very much different from one another the same way  Tool Offsetting  is very much different. Here I will discuss the cnc tool measurement on Fanuc. Tool Offset Setting on Fanuc TCSome cnc machines has some kind of built-in mechanism of tool-offsetting, this built-in mechanisn of tool-offsetting makes adding new tool s are changing existing tools a breeze, because you just tie-up the tool in the tool-post on the  cnc machine tool-turret  and just perform the procedure the cnc machine manufacture has given in the cnc machine operating and setting manual. The  Fanuc  controls such as Fanuc TC has this capability, Just tie up tool in the tool turret and perform a simple procedure and everything is done. The tool offsetting procedure might be different from version to version, But on Fanuc TC this procedure is simple as under.For tool offsetting of a new tool just tie up the tool in the tool post and in  MDI (Manual Data Input) Mode  call up the tool in the working position by entering the command T1, the T is for tool call up and 1 is tool number if you have your tool on another position you might change that with that tool number. Now change the cnc machine to Jog Mode and touch the tool cutting point to the finished component (already gripped in cnc machine jaws) face and bring the To ol-Geometry page and enter under the tool number the command MZ0 this command will clear any previous values and will measure the current tool’s tool-offset in Z-axis.Now touch the tool to a  known-diameter  on the component and again in the tool-geometry page enter the command MX50 you can enter the measured diameter value instead of 50. This way now we have calculated the tool-measurement on the Fanuc TC cnc machine control. CNC Dry Run Invaluable Tool for CNC Setter: Fig:24 It shows the power and the flexibility the cnc machine manufacturers and cnc control manufacturers give a  cnc machine setter  by integrating the Dry Run  on cnc machines. On some cnc machines the Dry Run is added as a  CNC Machine Mode  like Fanuc.On Fanuc cnc control you just select the Dry Run mode and cnc machine is now in Dry Run Mode. Introduction of Dry Run for CNC Machines Setting a new component on a cnc machine is not an easy job. You have to go through many important tasks like cnc machine zero offsetting (cnc machine shift value setting),tool offsetting of tools  used on cnc machine etc. Now if you have completed these all tasks, now comes the time to run the cnc program for the first time, A really crucial and time consuming cnc task. A small negligence might be cause of an accident on cnc machine (tool breakage etc. . To make the first run easy and safe the cnc machine manufacturers and cnc control manufacturers provide us a way by which we can easily control the tools feed with  feed override. So now the cnc setter is a bit easy because he can now run all the tools with a  Safe Feed. Now cnc setter easily can lower the tool feed when he feels the tool is entering a bit danger zone, and easily can increase the tool feed (to a rapid feed) when the tool is away from the component (so the time not go wasted with lower feed when tool is away from component).In Dry Run all the cnc blocks whether those are starting with G00 or G01 and other  G-code  like G02/G03 run with the same feed, which is controlled through Feed Override. On Fanuc the feed override is controlled through  Handwheel  after feed override button press, and there also exists a Rapid Feed Button which if pressed during Dry Run Mode the cnc machine program block will run with Rapid Feed. One point must be cleared for Fanuc control is that feed override also works in  Auto Mode and Single Block Mode  but in such modes the feed override only controls G01/G02/G03 like G-code.But feed override will not control the G00 (Rapid Traverse). But in Dry Run Mode all the cnc program will run with the feed which is controlled through Feed Override. An introduction to cnc machine speed override and feed override controls and safety instructions which must be adhere to while working with cnc machine feed and speed override. CNC Machine Speed Override / Feed Override Introduction Normally you program the speed and feed this way, N10 G97 S1000 G95 F0. 3 Fig:25Now for on e reason or other you want to increase or decrease the speed or feed of the cnc machine  for some time, you definitely have a way to just alter the  cnc machine program, but there is one more suitable solution the Feed Override and Speed Override Controls. The feed override and speed override are  the most suitable and handy way to control the  cnc machine feed and speed through cnc control panel. You control the speed and feed in percentage. When the feed override  is 100% the actually feed  which is programmed will be active.But if the feed override  is 50% then the feed  will decrease by that ratio, now the machine tools will run with 50% of feed. So if you  have programmed 0. 5 mm/rev feed then with 100% the 0. 5 will be active, but for 50%  feed override the actually tool feed will be 0. 25 mm/rev. The same rule applies for speed override, for 100% the actual programmed speed will be active and spindle will revolve  with the actual programmed speed. But  at 50% speed  override the spindle speed will drop by 50%. Feed Override Speed Override Minimum Maximum Values: Normally you can control speed override and feed override from 0% to 120%.At 0% speed override the spindle will stop rotating, and at 0% feed override the tool will stop working ( the tool will be stationary ). No doubt  120% feed  override and speed override is just  safe. But some cnc machines give even more flexibility I  have worked on a cnc machine which has its feed override 0% to 200%. Normal cnc machine has just 0% to 120% feed  override and speed override. Speed Override and Feed Override Safety Precautions Whenever handling the speed override and feed override always think about safety, safety of yourself, tool, machine, component and your surroundings.Never try to use the speed override and feed override if you don’t need it. Because when cnc programs are made the speed and feed is properly set for the machined component. The increase in feed or speed might break insert or even tool. CNC Backlash CNC Troubleshooting, In this category we will see the cnc machine from a different view (cnc machine maintenance), your feedback will really matter, and I hope you will share you knowledge and experience. I will talk about the  CNC  Backlash  which is found in cnc machine axis. * what is cnc backlash, * cnc backlash causes, * when to worry about cnc backlash, how to measure backlash, * How to resolve and compensate cnc backlash through hardware and cnc control software. Fig:26 *What is CNC Backlash? CNC Backlash is any kind of play which is found in cnc machine axis. or you might say, CNC Backlash  is non-movement of the cnc axis which occurs on axis reversal. *Causes of CNC Backlash? This play (backlash) might be due to * Clearance which is kept in mechanical parts to reduce friction. * As mechanical parts get loose with time. * As with time mechanical parts keep moving and rubbing each other and after long time they l ose their actual shape and size. CNC Backlash Is already there A cnc machine axis move due to their  Lead Screw  and  Lead Screw Nut. There is always kept a very minor backlash in the lead screw and lead screw nut to reduce damage and wear. *CNC Backlash When to Worry It is good if your cnc machine axis backlash is near 0. 0001? but not always possible, so 0. 0003? to 0. 0004? is acceptable. But if the amount of play in the lead screw and nut crosses this limit then there is the time to worry, and call up you mechanical maintenance guys. CNC Backlash How to Measure?CNC machine backlash can be measure with a  Dial Indicator  attached to an Adjustable Stand. Put the stand on the cnc bed and direct the needle (plunger) of the dial indicator towards the axis which you want to measure. 1. Set the dial needle to 0. 0mm (zero). 2. Now move the axis in one direction 0. 5mm. Dial indicator should show 0. 5mm travel. 3. Now reverse the same axis 0. 5mm. If your dial indicator now go es back to 0. 0mm, then everything is okay. But otherwise, if on reversal the dial lags behind, then the amount the dial lags behind is the backlash.CNC Backlash How to Resolve? ( Backlash Compensation ) Now you have two choices the hardware way and software way to resolve cnc backlash. You first better choose the hardware way, because normally backlash is due to lead screw or lead screw nut wear, so better resolve the issue by tightening them a bit if they are loose than required, there are plenty of other hardware ways to cope with backlash. CNC controls also give us the ability to control (compensate) cnc backlash through their parameters. CNC Backlash Compensation through CNC Control Parameters How Much Successful?The better advice is that you resolve the issue by changing the lead screw (if possible) or lead screw nut, or just tightening them if they are loose might work, but otherwise CNC control parameters can be changed to compensate backlash, the cnc lathe machine I work on with fanuc control has the 0. 012mm set in its parameters as the backlash compensation for x-axis and z-axis. So such values can be changed to resolve the backlash issue. 10. DRILLING AND TAPPING ON CNC MACHINES Drilling is the operation of producing circular hole in the work-piece by using a rotating cutter called DRILL.The machine used for drilling is called drilling machine. The drilling operation can also be accomplished in lathe, in which the drill is held in tailstock and the work is held by the chuck. The most common drill used is the twist drill. Drilling Machine It is the simplest and accurate machine used in production shop. The work piece is held stationary ie. Clamped in position and the drill rotates to make a hole. Types 1) Based on construction: Portable, Sensitive, Radial, up-right, Gang, Multi-spindle 2) Based on Feed: Hand driven ,Power driven Components of drilling machine:Spindle The spindle holds the drill or cutting tools and revolves in a fixed position in a sleeve. Sleeve The sleeve or quill assembly does not revolve but may slide in its bearing in a direction parallel to its axis. When the sleeve carrying the spindle with a cutting tool is lowered, the cutting tool is fed into the work: and when it’s moved upward, the cutting tool is withdrawn from the work. Feed pressure applied to the sleeve by hand or power causes the revolving drill to cut its way into the work a fraction of an mm per revolution. ColumnThe column is cylindrical in shape and built rugged and solid. The column supports the head and the sleeve or quill assembly. Head The head of the drilling machine is composed of the sleeve, a spindle, an electric motor and feed mechanism. The head is bolted to the column. Worktable The worktable is supported on an arm mounted to the column. The worktable can be adjusted vertically to accommodate different heights of work or it can be swung completely out of the way. It may be tilted up to 90 degree in either direction, to al low long pieces to be end or angle drilled. BaseThe base of the drilling machine supports the entire machine and when bolted to the floor, provides for vibration-free operation and best machining accuracy. The top of the base is similar to the worktable and may be equipped with t- slot for mounting work too larger for the table. Hand Feed The hand- feed drilling machines are the simplest and most common type of drilling machines in use today. These are light duty machine that are operated by the operator, using a feed handled, so that the operator is able to â€Å"feel† the action of the cutting tool as it cuts through the work piece. These drilling machines can be bench or floor mounted.Power feed The power feed drilling machine are usually larger and heavier than the hand feed ones they are equipped with the ability to feed the cutting tool in to the work automatically, at preset depth of cut per revolution of the spindle these machines are used in maintenance for medium du ty work or the work that uses large drills that require power feed larger work pieces are usually clamped directly to the table or base using t –bolts and clamps by a small work places are held in a vise. A depth –stop mechanism is located on the head, near the spindle, to aid in drilling to a precise depth.Sensitive or Bench Drilling Machine * This type of drill machine is used for very light works. Fig. 1 illustrates the sketch of sensitive drilling machine. * The vertical column carries a swiveling table the height of which can be adjusted according to the work piece height. * The table can also be swung to any desired position. * At the top of the column there are two pulleys connected by a belt, one pulley is mounted on the motor shaft and other on the machine spindle. * Vertical movement to the spindle is given by the feed handle by the operator. * Operator senses the cutting action so sensitive drilling machine.Fig:27 Up-Right Drilling Machine * These are medium heavy duty machines. * It specifically differs from sensitive drill in its weight, rigidity, application of power feed and wider range of spindle speed. Fig. 2 shows the line sketch of up-right drilling machine. * This machine usually has a gear driven mechanism for different spindle speed and an automatic or power feed device. * Table can move vertically and radially. * Drill holes up to 50mm Fig:28 Radial Drilling Machine * It the largest and most versatile used for drilling medium to large and heavy work pieces. Radial drilling machine belong to power feed type. * The column and radial drilling machine supports the radial arm, drill head and motor. Fig. 3 shows the line sketch of radial drilling machine. * The radial arm slides up and down on the column with the help of elevating screw provided on the side of the column, which is driven by a motor. * The drill head is mounted on the radial arm and moves on the guide ways provided the radial arm can also be swiveled around the co lumn. * The drill head is equipped with a separate motor to drive the spindle, which carries the drill bit.A drill head may be moved on the arm manually or by power. * Feed can be either manual or automatic with reversal mechanism. Drill Materials The two most common types are 1. HSS drill- Low cost 2. Carbide- tipped drills – high production and in CNC machines Other types are: Solid Carbide drill, TiN coated drills, carbide coated masonry drills, parabolic drills, split point drill. Fig. 4 shows various types of drills. Drill fixed to the spindle Fig:30 Tool Nomenclature: Fig. 31 Nomenclature of twist drill Tool holding devices Fig. 7 and Fig. 8 shows the different work holding and drill drift device.The different methods used for holding drill in a drill spindle are * By directly fitting in the spindle hole. * By using drill sleeve * By using drill socket * By using drill chuck Fig:32 Drilling operations: Operations that can be performed in a drilling machine are * Drillin g * Reaming * Boring * Counter boring * Countersinking * Tapping Drilling: It is an operation by which holes are produced in solid metal by means of revolving tool called ‘Drill’. Fig. 9 shows the various operations on drilling machine. Reaming: Reaming is accurate way of sizing and finishing the pre-existing hole.Multi tooth cutting tool. Accuracy of 0. 005mm can be achieved. Boring: Boring is a process of enlarging an existing hole by a single point cutting tool. Boring operation is often preferred because we can correct hole size, or alignment and can produce smooth finish. Boring tool is held in the boring bar which has the shank. Accuracy of 0. 005mm can be achieved. Fig. 33 Various operations on drilling machine Counter Bore :- This operation uses a pilot to guide the cutting action to accommodate the heads of bolts. Fig. 10 illustrates the counter boring, countersunk and spot facing processes. Countersink:-Special angled cone shaped enlargement at the end of the hole to accommodate the screws. Cone angles of 60 °, 82 °, 90 °, 100 °, 110 °, 120 ° Fig. 34 Counter boring, countersunk and spot facing Drilling  machines are tools that have a rotating, cutting component at one end that bores holes into different materials. There are several types of  drilling  machines that may be used for a wide variety of purposes, including woodworking, construction,  masonry, metalworking, medicine, oil  drilling, and many other fields. Common drills include the hand drill, push drill, pistol-grip drill, hammer drill, and  drill press.In addition to making holes, drills are often used to push screws into wood, metal, plastic, rock, or composites. The hand drill and push drill are both manually operated  drilling  machines that have been largely replaced by power drills. A hand drill works by turning a crank that rotates gears, which cause the chuck to turn. The chuck is the component of the  drilling  machine  that holds the bit, or the end cutting piece. The push drill is a skinny tool resembling a screwdriver with a handle that can be pushed down on a threaded shaft, or a pole with helical ridging.As the handle is pushed down along threading, the shaft, chuck, and bit spins downward, much like pumping a toy metal top. Pistol-grip drills are the most commonly used  drilling  machines. These are corded electric drills that are typically shaped roughly like a pistol, with a trigger switch that starts a motor inside the drill. The motor causes the chuck and bit to spin in continuous revolutions. These drilling  machines may be used to make holes for bolts or other purposes, to push screws into wood, plastic, or other materials, and to bore countersinks.A  countersink  is a screw-shaped hole that is made before the screw is drilled in, preventing splintering or pulling of the plastic or wood around the head of the screw. A pistol-grip drill is also available in a battery-powered, cordless version , though they are usually more expensive. There are many different types of this drill and several indications for use. It is also possible to adapt the drill with an attachment, such as sanding or sawing components. A hammer drill, also called a rotary hammer, is similar to a pistol-grip drill, but also applies a punching motion to complement the rotational action of the bit.This hammering, forward force makes it useful for tougher materials, such as concrete or stone, that standard electric drills cannot cut through. For softer materials, however, the hammer drill may apply excessive force and a standard drill may be a better choice. A drill press is a type of drill that may stand on the floor or be mounted on a workbench. The base of the  machine  is bolted to the table or floor and a column rises up from the base to support the back of the head of the drill. The column also supports a table that can be adjusted in height between the head and the base.The spindle, a metal com ponent that holds the chuck and drill bit, extends downward from the front of the head, parallel to the column. A larger distance between the spindle and column allows wood with a larger width to be drilled. An â€Å"on† switch triggers the spindle to spin and levers attached to the head of the drill press move the spindle and chuck to move up or down. These  drilling  machines are suited for accurate  drilling, because the bit is fixed and the work can be secured to the table with clamps or a vise. ————————————————- Types Of Drill BitsDrill bits are tools used in making cylindrical holes. Various types of drill bits are designed for different uses. Drill bits are equipments or tools that are used in making cylindrical holes. Drill bits can also be referred to as a drilling machine. Drill bits are available in various drill types such as metal drills, gun dril ls, screw machine drills, core drills, step drills, spade drills, forstner drills, masonry drills, dental or surgical drills, wood bits, twist drills, drill blank taper drills and much more. They are designed to cut while doing a clockwise rotating motion. Several drill bits are coolant fed.They contain a channel or hole for directing the coolant fed near to the cutting edges. The split point drill heads of drill bits are used for chip clearance and for excellent centering. Drill bits can also be used in cutting aluminum, general-purpose metals, brass, copper, bronze, ceramic, and plastic, stainless steel, steel, wood, titanium and hardened materials. Various types of drill bits are designed for different uses. Listed below are some types of Drill Bits. Twist Drill: It drills holes in plastic, metal and wood. This drill is currently produced with a width covering a range from 0. 5 millimeters to 100 millimeters while its length is around 1000 millimeters. The most usual twist drill has a tip angle of 118 degrees. This is a proper angle for an extensive array of job. It also has a long series drill for extended length twist drills. It is not advisable to drill deep holes using this twist drill. Diamond Drill Bit: This particular drill is used in the bathroom for updating or remodeling. It is also used in redesigning your kitchen decoration. Furthermore, it is used on ceramic, glass, tile, limestone, stained glass, marble, fiberglass, porcelain, stone, slate and porcelain tile.When using this drill, the main concern is to obtain water at the edge of the drill bit. Drilling fiberglass may be done with or without water but make sure that the fiberglass has ample amount of water just to get the drill wet. Indexable Drill Bit: This provides an excellent performance in making short-hole drillings. Stainless steel is drilled 3x in diameter and only a short-hole must be done. Listed below are some other types of drill bits Adjustable Bit: This is built with a changeabl e cutter blade to bore holes of various sizes. It is also used for drilling gaps for wiring or piping.Around-the-corner bit: It is used to cut arched holes that are stretched in corners with a diagonal cutting surface. Auger Bits: This drill creates drill holes in wooden materials. The drill ends have a screw head so that the bits may be self fed. Brad-point drill: This drill looks almost the same as the usual bits but it has sharpened point to make wood drilling a lot easier. This drill has cleaner holes other than spade bits. Counterbore: The drill allows a screw to be driven under the wood outside. The holes that are drilled may be filled with a plug or wire.Drill Saw Bit: It is used to cut holes such as wood and metal and can enlarge current holes. Countersink: A drill that has an angled tip design that forms a â€Å"slump† in the screw head. Fly cutter: This one is often used to cut circles in wood and other soft metals. The diameter of circles may be adjusted by changin g the cutter blade setting. Hole saw: It cut holes from one to six centimeters in diameter and has a center bit for directing the cutting blade edge of the saw. Reamer bit: The tapered bit of reamer may be used on existing holes rather than to enlarge holes.Screw pilot bit: This beautiful bit is used for drilling body holes. A pilot hole is used along with the countersink. Wire Brushes: It use to remove rust and to clean up metal and is available either as a wheel or a cup with wire brush. Plastic bit: This is designed with a tip so as to prevent splintering when drilling plastic. It is important to reduce the speed and slowly drill the other side of the plastic. Plug cutter: Use this to remove cylindrical shapes from the wood. It covers the screw using a small cylindrical plate. Tapping:- Tapping is the process by which internal threads are formed.It is performed either by hand or by machine. Minor diameter of the thread is drilled and then tapping is done. Fig. 11 show the tapping processes. Fig. 35 Hand taps and tapping process using tap wrench Fig. 36 Various operations performed on drilling machine Work Holding Devices 1. Machine Table Vice: The machine vice is equipped with jaws which clamps the work piece. The vice can be bolted to the drilling table or the tail can be swung around swung around. Fig. 13 shows the standard and swivel vice. The swivel vice is a machine wise that can be swivel through 360 ° on a horizontal plane. Fig:37 1.Step Blocks These are built to allow height adjustment for mounting the drilling jobs and are used with strap clamps and long T-slot bolts. 2. Clamps These are small, portable vises , which bears against the work piece and holding devices. Common types of clamps are C-clamp, Parallel clamp, machine strap clamp, U-clamp etc.. Fig. 14 shows the correct and incorrect methods of mounting the work piece. Fig:38 11. APPLICATION OF CNC MACHINES ? cutting ? drilling ? milling ? welding ? boring ? bending ? spinning ? pinning ? gluing ? sewing ? routing Its application in some industries like -Automotive Industry Aerospace Industry -Machinery Industry -Electrical Industry -Instrumentation Industry Automotive Industry Different Products Fig:39 Aerospace Industry Aircraft Turbine Machined by 5-Axis CNC Milling Machine Fig:40 12. ADVANTAGES AND DISADVANTAGES OF CNC -Ease of Use ? CNC machines are easier for beginners ? Operation of several CNC machines at same time ? Some CNC machines don’t need any operator indeed call their operator in case of the emergencies. High Efficiency ? operate almost continuously 24 hours a day, 365 days a year. Expanding Options ? Expand the machine's capabilities with SoftwareChanges and updates. No Prototyping ? new programmers provide elimination build a prototype, save time and money. Precision ? Parts are identical to each other. Reduce Waste ? Reduce waste as errors allows minimize wasted Material. Disadvantage of CNC Machines Cost CNC machinery: ? costs quite a lot m ore than conventional machinery. ? Does not eliminate the need for expensive tools. ? Expensive to repair. 13. CONCLUSION CNC machines which are applicable any type of processing. manufacturing anything is identical in shorter time. CNC machines provide many advantages. Many industries prefer using CNC machines.