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WEB SIGHTINGS by Matthew McKenna CNC tips and tricks the Internet With constant advances in automation, it is almost impossible to keep pace with the latest developments. New gadgets and shortcuts leave some CNC (computer numerical control) operators and programmers in the dark when finding the best methods to cut metal. Some CNCs are so new that it is difficult to find training; and training can be the difference of writing nine pages of G-code opposed to one page to make the exact same cut. Not only does programming knowledge save time, but it also reduces the risk for human error when writing code. The Internet can be a CNC programmer's dream, if the programmer knows what Web sites to visit. The CNC Programming Page The CNC Programming Page authored by "The CNC Guy" Chris Mackay, is the CNC programmer's ultimate reference. The site features a basic training page.which covers everything from an introduction to setups to subprogramming techniques. For the more experienced programmer, MacKay's site offers an encyclopedia of G- and M-codes. The codes are defined, and some codes are accompanied by diagrams. G-codes covered are G00 to G92. Miscellaneous codes, including algorithms and branching controls, are also covered. The site's programming examples and charts page covers the programming of operations such as deep-hole drilling and a simple profile. Other portions of the site include a message board, classified ads, CNC-related links, and CNC-related books. CNC Programming & Machining Tips http://members.aol.com/away2422/2index.html This no-frills Web site features simple tips on maximizing a CNC. New tips are added daily. A sample tip: "Did you know that you can use negative offsets on machining centers to make an inside and outside part using the same program? You just make sure that you have enough room to move into the cutter comp." The site is authored by John Tomasura of Stellar Programming and Machining, Sweet Valley, PA. John Queenan's CNC Stuff (3-axis machine) http://alpha.fanshawec.on.ca/cnc/cnc11.htm John Queenan's CNC Stuff specifically covers 3-axis machining. Although, designed as a reference for students, the Web site can be referred to by programmers and machinist of different levels of expertise. Particularly useful to a CNC machinist just starting out, a comprehensive glossary is available on the Web site. Also available on the site is a listing of G- and M-codes and their functions. CNC Quiz http://www.rose-training.com/quiz.htm RTS Inc, Cleveland, OH, tests your CNC knowledge with an online quiz. The ten-question quiz, originally printed in Metlfax's sister publication Tooling & Production, separates CNC users from CNC experts. A sample question: "Lathes are programmed in IPR feedrate, why do CNC mills use IPM?" The Web site is also a harbor of training information. RTS Inc specializes in industrial training. CNC Tips & Hints http://cncci.com/tips/tips.htm This tips page from CNC Concepts Inc, Cary, IL, offers an array of hints submitted by CNC programmers from around the world. G-codes are also displayed to assist programmers. A sample suggestion about rapid machining: "To stress this point, we offer a simple rule of thumb called the one second rule. One second of saved cycle time will total 16.6 minutes of saved production time in one thousand cycles. While this may not sound like a lot, it can add up fast. If but four seconds can be saved per cycle in a one thousand piece order, over one hour of production time can be saved. And if this four seconds can be saved without spending money (by simply formatting your programs efficiently), all the better." Topics covered include five-axis machining, custom macros for taper thread milling, and parametric programming. While these Web sites can be used as good references, they should not be taken as the absolute truth. If you have any suggestions, add to these sites to help fellow CNC machinists. If you have any questions about your specific CNC, don't hesitate to contact the manufacturer. [metlfax/incl/99mfx.htm] |
Departments Show Report: Workplace Training: Book Review: Shop Management: WebSightings: Fundametls
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