Download PDF CNC Programming Skills: Understanding Offsets on Fanuc MachinesBy S. K. Sinha
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CNC Programming Skills: Understanding Offsets on Fanuc MachinesBy S. K. Sinha
Download PDF CNC Programming Skills: Understanding Offsets on Fanuc MachinesBy S. K. Sinha
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This is the fourth e-book in the series, “CNC Programming Skills.” It explains the concept of offsets and how to measure these manually on i-series Fanuc machines or a similar control.
The very first thing which a person, who is new to the CNC world, needs to know is how to setup the coordinate system for machining. The machining coordinate system is defined by adding relevant offsets to the pre-defined machine coordinate system. When it comes to offsets, oh! these are just too many to confuse most people: External offset, Work offset, Geometry offset, Wear offset, Length offset, to name a few. And, these are to be understood in totality, as these are interrelated. Certain things are illogical also such as the wear value of the tool tip number on a lathe. Unfortunately, we cannot question Fanuc. We have to understand their language if we want to survive in the CNC world.
This book is written keeping in view the requirements and expectations of beginners who wish to learn on their own with no helping hand available to them. No background is assumed. One who has at least seen the operator’s panel and the manual data input panel, and knows elementary things like the directions of axes on a CNC machine, would be able to follow the book. Starting from the very basic, it has everything a seasoned CNC operator is supposed to know.
The following excerpts from the book would give some idea of the way of presentation:
Entering Offset Values into Offset Tables:
The procedure on a lathe as well as on a milling machine is similar. The basic procedure involves bringing the tool to the origin (or to a known coordinate position) of the desired coordinate system, and then use the measure feature of the control (through the MEASUR soft key) to enter the offset values automatically. Let us first take the example of determining work offsets on a lathe:
• Measure the diameter of the workpiece for which the work offset is to be determined, and place it in the chuck at the desired axial position.
• Select the MDI mode, and execute the desired work coordinate system code (G54 through G59) for which work offset is to be entered (so as to define or redefine it).
• Select the tool which is desired to be made the master tool, say, tool number 1, by pressing the tool change button on the machine operator’s panel required number of times. Alternatively, execute the appropriate tool change code (T0100 for tool number 1) in the MDI mode.
• Move this tool in the negative X direction to let it touch the workpiece at a known diameter position (say, X = 10) manually, using continuous feed (JOG mode), incremental feed (INC mode) or handle feed (HANDLE mode), as appropriate / convenient. For accuracy in positioning, it is recommended to use successively smaller increments (say, 0.1 mm, then 0.01 mm, followed by 0.001 mm), as the tool approaches the desired position. Continuous feed should be used only for quickly bringing the tool near this position, initially. To judge whether the tool has actually touched the surface, turn the spindle manually and look for a tool mark on the surface. Another method involves inserting and continuously shaking a thin piece of paper between the tool and the workpiece while the tool is made to approach the workpiece. The moment the paper gets stuck, the tool can be considered to have touched the surface. While inputting the values in the offset tables, allowance for the thickness of the paper can be taken, if felt necessary.
• Press OFS/SET key on the MDI panel. OFFSET, SETING, WORK and OPRT soft keys will appear. Pressing OFFSET soft key will display WEAR, GEOM and OPRT soft keys.
• For setting work offsets, press the WORK soft key. If it is already highlighted, i.e., selected by default, there is no need to press it again. The currently active workpiece coordinate system is displayed at the top left corner of the work offset screen.
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- Sales Rank: #477326 in eBooks
- Published on: 2015-03-28
- Released on: 2015-03-28
- Format: Kindle eBook
About the Author
Prof. S. K. Sinha earned his Ph.D. in Mechanical Engineering from Indian Institute of Technology, Kanpur in 1993. He has 25 years of teaching experience, and has been working in the CNC area for over 15 years. He has authored "CNC Programming Using Fanuc Custom Macro B," published by McGraw-Hill, New York. Apart from this book, and a book on the basic CNC programming, he has published several e-books (Kindle Edition) in the series "CNC Programming Skills."
The first book in this series is "CNC Programming Skills: Program Entry and Editing on Fanuc Machines," which gives complete, yet concise and step-by-step information on editing procedures using the MDI panel.
The second book in this series is "CNC Programming Skills: Understanding G73 on a Fanuc Lathe." Its publication was inspired by the fact that most people, just because of ignorance, do not use such a powerful canned cycle G73 even when it has got a perfect application.
The third book in this series is "CNC Programming Skills: Live Tool Drilling Cycles on a Fanuc Lathe." These days higher-end lathes come equipped with live-tooling arrangement, allowing drilling, boring and tapping anywhere on the face of the workpiece, as well as in the radial direction at any angular position, using built-in canned cycles. These are explained with suitable examples in quite detail.
The fourth book in this series is "CNC Programming Skills: Understanding Offsets on Fanuc Machines." The very first thing which a CNC operator needs to know is how to setup the coordinate system for machining. This is explained in detail in this book.The fifth book in this series is "CNC Programming Skills: Understanding G32, G34, G76 and G76 on a Fanuc Lathe." This book explains nearly everything one needs to know about threading on a lathe.
Some more books are planned in this series.
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