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COMMON G CODE, M CODE USED ON CNC MACHINING PROGRAM

COMMON G CODE, M CODE USED ON CNC MACHINING PROGRAM

Issue Time:2021-05-31
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

Non-modal

G17

02

XY plane selection

Modal

G18

XZ plane selection

Modal

G19

YZ plane selection

Modal

G28

00

Machine return to reference point

Non-modal

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

Non-modal

G53

00

Coordinate system selection

Non-modal

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

Non-modal

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

Left-hand 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

Non-modal

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