Common G codes and M codes for CNC machine controls

Not all codes are available on all controls, and some controls have other codes.See your machine manual for detailed explanations.

CNC G codes

G00 - Positioning at rapid speed; Mill and LatheG01 - Linear interpolation (machining a straight line); Mill and LatheG02 - Circular interpolation clockwise (machining arcs); Mill and LatheG03 - Circular interpolation, counter clockwise; Mill and LatheG04 - Mill and Lathe, DwellG09 - Mill and Lathe, Exact stopG10 - Setting offsets in the program; Mill and LatheG12 - Circular pocket milling, clockwise; MillG13 - Circular pocket milling, counterclockwise; MillG17 - X-Y plane for arc machining; Mill and Lathe with live toolingG18 - Z-X plane for arc machining; Mill and Lathe with live toolingG19 - Z-Y plane for arc machining; Mill and Lathe with live toolingG20 - Inch units; Mill and LatheG21 - Metric units; Mill and LatheG27 - Reference return check; Mill and LatheG28 - Automatic return through reference point; Mill and LatheG29 - Move to location through reference point; Mill and Lathe (slightly different for each machine)G31 - Skip function; Mill and LatheG32 - Thread cutting; LatheG33 - Thread cutting; MillG40 - Cancel diameter offset; Mill. Cancel tool nose offset; LatheG41 - Cutter compensation left; Mill. Tool nose radius compensation left; LatheG42 - Cutter compensation right; Mill. Tool nose radius compensation right; LatheG43 - Tool length compensation; MillG44 - Tool length compensation cancel; Mill (sometimes G49)G50 - Set coordinate system and maximum RPM; LatheG52 - Local coordinate system setting; Mill and LatheG53 - Machine coordinate system setting; Mill and LatheG54~G59 - Workpiece coordinate system settings #1 t0 #6; Mill and LatheG61 - Exact stop check; Mill and LatheG65 - Custom macro call; Mill and LatheG70 - Finish cycle; LatheG71 - Rough turning cycle; LatheG72 - Rough facing cycle; LatheG73 - Irregular rough turning cycle; LatheG73 - Chip break drilling cycle; MillG74 - Left hand tapping; MillG74 - Face grooving or chip break drilling; LatheG75 - OD groove pecking; LatheG76 - Fine boring cycle; MillG76 - Threading cycle; LatheG80 - Cancel cycles; Mill and LatheG81 - Drill cycle; Mill and LatheG82 - Drill cycle with dwell; MillG83 - Peck drilling cycle; MillG84 - Tapping cycle; Mill and LatheG85 - Bore in, bore out; Mill and LatheG86 - Bore in, rapid out; Mill and LatheG87 - Back boring cycle; MillG90 - Absolute programmingG91 - Incremental programmingG92 - Reposition origin point; MillG92 - Thread cutting cycle; LatheG94 - Per minute feed; MillG95 - Per revolution feed; MillG96 - Constant surface speed control; LatheG97 - Constant surface speed cancelG98 - Per minute feed; LatheG99 - Per revolution feed; Lathe

CNC M Codes

M00 - Program stop; Mill and LatheM01 - Optional program stop; Lathe and MillM02 - Program end; Lathe and MillM03 - Spindle on clockwise; Lathe and MillM04 - Spindle on counterclockwise; Lathe and MillM05 - Spindle off; Lathe and MillM06 - Toolchange; MillM08 - Coolant on; Lathe and MillM09 - Coolant off; Lathe and MillM10 - Chuck or rotary table clamp; Lathe and MillM11 - Chuck or rotary table clamp off; Lathe and MillM19 - Orient spindle; Lathe and MillM30 - Program end, return to start; Lathe and MillM97 - Local sub-routine call; Lathe and MillM98 - Sub-program call; Lathe and MillM99 - End of sub program; Lathe and Mill