![]() Line 8 Set compensation left Y travel move at specified speed feed rate Line 7 Move at specified speed Z travel feed rate Line 6 Tool length compensation offset code Z travel coolant on Line 5 Sets absolute sets workpiece coordinate system fast move to start point set speed spindle on Line 4 Calls out the tool in turret position 1 automatic tool change Line 3 Lines can be numbered as needed comments are placed in parentheses ![]() ![]() % Line-by-Line Description of G-code stepsĪ description of each of the G-code commands for this sample program appears below: Users should always follow the instructions for their particular machines. Codes are based on Fanuc controllers and this same program on another controller would probably look similar but might have minor differences. The following example program could be used to mill a 6 in. For more information about G-code and M code, please refer to other related articles in this series listed at the end of this article. This article presents a simple CNC program to demonstrate the typical structure and workings of G-code. Through various combinations of G-code, M-code, and other lettered commands, a CNC machine is told to change tools, start spindles, move cutting tools, etc. CNC programs direct computer-controlled lathes and mills – usually referred to as turning and machining centers – in the machining of parts.
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