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Part programming for computer controlled machining is so important to the manufacturing industry that many technologies have been developed to accomplish the task. Specifically, language based programming, graphical CAD/CAM, conversational controllers, and most recently, STEP-NC were all developed for part programming. G-code is the standard programming language used to guide machine tools and was developed by the Electronics Industries Association (EIA) in the early 1960’s. Programming at the G-code level is also referred to as manual programming. Although G-code is the standard language used to guide machine tools, programming at the G-code level is time consuming, math intensive, and accordingly, error prone. Conversational programming (aka, shop floor programming) has been developed as an added function of a machine tool control and avoids G-code programming altogether. The true power of G-code to guide machine tools relates to cutting accuracy and capabilities that can be done quickly with computer control compared to conventional machining. The most often used areas of advanced G-code programming to guide computer controlled machine tools include automatic tool changes, cutter length compensations, cutter radius compensations, canned cycles, and subroutine programming. Format examples: Examine the cutter coordinate/cutter motion sections of the three examples in Appendix C. Notice that 1) each cutter coordinate in the milling and torch operation has a leading “X” or “Y”, whereas the turning operation has a leading “X” or “Z.” Notice that the coordinates are 2) rounded to 2, 3, or 4 places. Software for Manual CNC Programming. CNC Construct can prompt for and add cutter on/cutter off commands to G-code program, and add prepatory commands from user-defined templates to G-Code programs. CNC Construct would make a big difference, and allow for much improvement in the understanding and application of manual CNC programming for the educational and industrial programs that incorporate it.
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