Safety block to ensure machine is in safe mode. The program in Table 1: below machines a square contour and drills a hole. It is the job of the job of the CAD/CAM software Post Processor to properly format and write the CNC program. While these rules are covered in this chapter, do not concern yourself with learning every nuance of the language. Some codes have different meanings depending on how and where there are used. For example, some codes are modal, meaning they do not have to be repeated if they do not change between blocks. Like any language, the G-code language has rules. Table 3 and Table 4 in section G & M Codes show the most common G and M codes that should be memorized if possible. Programs that use multiple tools repeat steps two through nine for each. The steps listed above represent the simplest type of CNC program, where only one tool is used and one operation performed. The blocks are arranged in the following order: Blocks are arranged in a specific sequence that promotes safety, predictability and readability, so it is important to adhere to a standard program structure. Each sentence in a CNC program is written on a separate line, called a Block. They read like a book, left to right and top-down.
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