G code that you must know for CNC machining

 G00------Rapid positioning G01------Linear interpolation G02------Clockwise circular interpolation G03------Counterclockwise circular interpolation G04------Timed pause G05------Circular interpolation through the intermediate point G06------Parabolic interpolation G07------Z spline interpolation G08------Feed acceleration G09------Feed deceleration G10------Data setting G16------Polar coordinate programming G17------Processing XY plane G18------Processing XZ plane G19------Processing YZ plane G20------Inch size (Fanuc system) G21-----Metric size (Fanuc system) G22------Radius size programming method G220-----Use on the system operation interface G23------Diameter size programming method G230-----Use on the system operation interface G24------End of subroutine G25------Jump processing G26------Cycle processing G30------Cancel the override G31------Define the override G32------Equal pitch thread cutting, English G33------Equal pitch thread cutting, Metric G34------Increase pitch thread cutting G35------Decrease pitch thread cutting G40------Cancel tool compensation/tool offset G41------Tool compensation--left G42--- ---Tool compensation--right G43------Tool offset--positive G44------Tool offset--negative G45------Tool offset +/+G46------Tool offset +/-G47------Tool offset -/-G48------Tool offset -/+G49------Tool offset 0/+G50------Tool offset 0/-G51------Tool offset +/0G52------Tool offset -/0G53------Linear offset, cancel G54------Set Set workpiece coordinates G55------Set workpiece coordinate 2 G56------Set workpiece coordinate 3 G57------Set workpiece coordinate 4 G58------Set workpiece coordinate 5 G59------Set workpiece coordinate 6 G60------Accurate path mode (fine) G61------Accurate path mode (medium) G62------Accurate path mode (coarse) G63------Tapping G68------Tool offset, inner angle G69------Tool offset, outer angle G70------Inch size Inch (this is Siemens, Fanuc is G21) G71------Metric size mm G74------Return to reference point (machine zero) G75------Return to programming coordinate zero G76------Threading compound cycle G80------Cancel fixed cycle G81------External circle fixed cycle G331-----Thread fixed cycle G90------Absolute size G91------Relative size G92------Prefabricated coordinates G93------Time countdown, feed rate G94------Feed rate, feed per minute G95------Feed rate, feed per revolution G96------Constant linear speed control G97------Cancel constant linear speed control