COMMON G CODE, M CODE USED ON CNC MACHINING PROGRAM
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 Issue Time
 May 31,2021
Summary
COMMON G CODE, M CODE USED ON CNC MACHINING PROGRAM
1. Programming instructions
1.Preparation function (G function)
The preparation function G code is used to specify the relative motion trajectory of the tool and the workpiece, the machine coordinate system, the coordinate plane, the tool compensation, the coordinate offset and other processing operations. Below is a list of G function codes commonly used in CNC machining.
G code  Group  Function  Remark 
G00  01  Positioning (Fast travel)  Modal 
G01  Linear interpolation  Modal  
G02  Clockwise circular interpolation  Modal  
G03  Counterclockwise circular interpolation  Modal  
G04  00  Tool stop, accurate stop  Nonmodal 
G17  02  XY plane selection  Modal 
G18  XZ plane selection  Modal  
G19  YZ plane selection  Modal  
G28  00  Machine return to reference point  Nonmodal 
G40  07  Tool radius compensation cancellation  Modal 
G41  Tool radius left compensation  Modal  
G42  Tool radius right compensation  Modal  
G43  08  Tool length positive compensation  Modal 
G44  Tool length negative compensation  Modal  
G49  Tool length compensation cancellation  Modal  
G50  11  Scaling cancellation  Modal 
G51  Scaling valid  Modal  
G50.1  22  Programmable mirror cancellation  Modal 
G51.1  Programmable mirror valid  Modal  
G52  00  Local coordinate system setting  Nonmodal 
G53  00  Coordinate system selection  Nonmodal 
G54  14  Workpiece coordinate system 1 selection  Modal 
G55  Workpiece coordinate system 2 selection  Modal  
G56  Workpiece coordinate system 3 selection  Modal  
G57  Workpiece coordinate system 4 selection  Modal  
G58  Workpiece coordinate system 5 selection  Modal  
G59  Workpiece coordinate system 6 selection  Modal  
G65  00  Macro program invoking  Nonmodal 
G66  12  Macro program modal invoking  Modal 
G67  Macro program invoking cancellation  Modal  
G68  16  Coordinate rotation  Modal 
G69  Coordinate rotation cancellation  Modal  
G73  09  Chip removal drilling cycle  Modal 
G74  Lefthand tapping thread cycle  Modal  
G76  Fine boring cycle  Modal  
G80  Canned cycle cancellation  Modal  
G81  Drilling cycle  Modal  
G82  Back boring cycle  Modal  
G83  Deep hole drilling cycle  Modal  
G84  Tapping cycle  Modal  
G85  Boring cycle  Modal  
G86  Boring cycle  Modal  
G87  Back boring cycle  Modal  
G88  Boring cycle  Modal  
G89  Boring cycle  Modal  
G90  03  Absolute value programming  Modal 
G91  Incremental value programming  Modal  
G92  00  Workpiece coordinate system setting  Nonmodal 
G94  05  Feed per minute  Modal 
G95  Feed per revolution  Modal  
G98  10  Canned cycle return to the initial point  Modal 
G99  Canned cycle return to point R  Modal 
2. Auxiliary function （M code for Fanuc）
Auxiliary function codes are used to instruct the connection and shutdown of auxiliary devices of CNC machine tools, such as spindle rotation/stop, cutting fluid opening/closing, chuck clamping/releasing, tool replacement, etc. Below is the list of M codes widely used in CNC machining：
Code  Function  Description 
M00  Program pause  When the block with M00 instruction is executed, the spindle rotation and cutting fluid will stop. Press the (Cycle Start) key again to continue executing the following block 
M01  Program selection stop  The function is the same as M00, but only when the (select stop) key on the machine operation panel is in the "ON" state, M01 will be executed, otherwise it be executed after skipping 
M02  End of program  In the last section of the program, after executing this instruction, the spindle stops, the cutting fluid is closed, and the automatic operation stops, and the machine is in the reset state 
M30  End of program  Also placed in the last section of the program, in addition to executing the content of M02, it also returns to the first section of the program to prepare for the next workpiece processing 
M03  Spindle positive rotation  Spindle rotates in the clockwise direction 
M04  Spindle negative rotation  Spindle rotates on the counter clock wise direction 
M05  Spindle stop  Spindle stops rotating 
M06  Tool changing  On automatic tool changing 
M08  Cutting liquid on 

M09  Cutting liquid off 

M98  Subroutine invoking  For subroutine 
M99  End of subroutine  End of subroutine and return to the main program 