Introduction to CNC Code - 1: Overview
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Computer Numerical Control (CNC) is the process of having a machine controller manage the operation of a machine. This would include the table motions, the spindle speed, and various other machining functions. This is all accomplished by a program that is written using NC code. These coded instructions are carefully arranged by using letters (A,B,C,....Z), numbers (1,2,3...9) and symbols(+,-,/...etc.) to create a program. These instructions can range from a few lines for a simple part to many thousand of lines for a complex part. If the cumulative instructions (program) are written correctly it will provide specific guidance on exactly what functions you want the machine to perform, resulting in the production of a quality part. On the other hand, a poorly written program can have disastrous results... scraping parts, destroying tools, and possibly damaging the machine. In extreme cases the operator's own personal safety may be in jeopardy.

Before continuing the student may wish to get a glossary definition of CNC and NC just to make things more clear when the two terms are used. R.S.
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label:CNC, character,word, block, program, address word, g codes, m codes