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CNC G/M- Code
G & M code for Mill and Lathe
147
Engineering
Undergraduate 2
07/29/2018
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Term

Mill

M0

 Definition

 

program stop

 
Term

Mill

M1

 Definition

 

optional stop
Term

Mill

M2

 Definition

 

end of program

(w/o reset, no rewind)

 
Term

Mill

M3

 Definition

 

spindle on CW
Term

Mill

M4

 Definition

 

spindle on CCW
Term

Mill

M5

 Definition

 

spindle stop
Term

Mill

M6

 Definition

 

tool change
Term

Mill

M7

 Definition

 

mist coolant 

ON
Term

Mill

M8

 Definition

 

flood coolant 

ON
Term

Mill

M9

 Definition

 

coolant 

OFF
Term

Mill

M13

 Definition

 

M3 & M8
Term

Mill

M14

 Definition

 

M4 & M8
Term

Mill

M15

 Definition

 

M5 & M9
Term

Mill

M16

 Definition

 

M6 & M8
Term

Mill

M19

 Definition

 

spindle orientation
Term

Mill

M21

 Definition

 

mirror:

X axis 
Term

Mill

M22

 Definition

 

mirror:

Y axis 
Term

Mill

M23

 Definition

 

mirror:

OFF 
Term

Mill

M30

 Definition

 

end of program

(always w/ reset & rewind)

 
Term

Mill

M52

 Definition

 

unload last tool from spindle
Term

Mill

M73

 Definition

 

parts catcher advance
Term

Mill

M74

 Definition

 

parts catcher:

RETRACT
Term

Mill

M97

 Definition

 

local sub-program
Term

Mill

M98

 Definition

 

exit to sub-program
Term

Mill

M99

 Definition

 

return to main program
Term

Mill

G0

 Definition

 

rapid transverse
Term

Mill

G1

 Definition

 

linear interpolation
Term

Mill

G2

 Definition

circular interpolation 

CW
Term

Mill

G3

 Definition

circular interpolation 

CCW
Term

Mill

G4

 Definition

 

dwell
Term

Mill

G9

 Definition

 

exact stop

(non-modal)
Term

Mill

G15

 Definition

polar coordinate command:

CANCEL
Term

Mill

G16

 Definition
polar coordinate command
Term

Mill

G17

 Definition

 

select XY plane
Term

Mill

G18

 Definition

 

select XZ plane
Term

Mill

G19

 Definition

 

select YZ plane
Term

Mill

G20

 Definition

 

programming in inches
Term

Mill

G21

 Definition

 

programming in millimeters
Term

Mill

G22

 Definition

 

stored stroke limit

ON
Term

Mill

G23

 Definition

 

stored stroke limit 

OFF
Term

Mill

G28

 Definition

 

return to home
Term

Mill

G40

 Definition

 

cancel cutter comp
Term

Mill

G41

 Definition

instate cutter comp:

LEFT
Term

Mill

G42

 Definition

instate cutter comp:

RIGHT 
Term

Mill

G43

 Definition

instate tool length comp:

POSITIVE
Term

Mill

G44

 Definition

instate tool length comp:

NEGATIVE
Term

Mill

G52

 Definition

 

local coordinate system (LCS)
Term

Mill

G53

 

 Definition

 

machine coordinate system
Term

Mill

G54

 Definition

 

instate fixture offset #1
Term

Mill

G55

 Definition

 

instate fixture offset #2
Term

Mill

G56

 Definition

 

instate fixture offset #3
Term

Mill

G61

 Definition

 

exact stop

(modal)
Term

Mill

G63

 Definition

 

tapping mode
Term

Mill

G64

 Definition

 

cutting mode
Term

Mill

G68

 Definition

 

rotate coordinate system
Term

Mill

G69

 Definition

rotate coordinate system:

CANCEL
Term

Mill

G73

 Definition

peck drilling cycle

(partial retraction from pecks)

 
Term

Mill

G74

 Definition
tapping cycle / LEFT hand threading in M4
Term

Mill

G76

 Definition

 

fine boring cycle
Term

Mill

G80

 Definition

 

cancel canned cycle
Term

Mill

G81

 Definition

 

drilling cycle
Term

Mill

G82

 Definition

 

counter boring / spot drilling cycle
Term

Mill

G83

 Definition

 

peck drilling cycle 

(full retraction from pecks)
Term

Mill

G84

 Definition
tapping cycle / RIGHT hand threading in M3
Term

Mill

G85

 Definition

 

reaming cycle
Term

Mill

G86

 Definition

boring cycle:

feed in > spindle stop > rapid out
Term

Mill

G89

 Definition

boring cycle:

feed in > dwell > feed out

 
Term

Mill

G90

 Definition

 

absolute coordinates
Term

Mill

G91

 Definition

 

incremental coordinates
Term

Mill

G92

 Definition

 

position register 

(programming of vector from part zero to tool tip)
Term

Lathe

M0

 Definition

 

program stop
Term

Lathe

M1

 Definition

 

optional stop
Term

Lathe

M2

 Definition

 

end of program

(usually w/ reset, no rewind)
Term

Lathe

M3

 Definition

 

spindle on 

CW
Term

Lathe

M4

 Definition

 

spindle on 

CCW

 
Term

Lathe

M5

 Definition

 

spindle stop
Term

Lathe

M6

 Definition

 

tool change
Term

Lathe

M7

 Definition

 

mist coolant 

ON
Term

Lathe

M7

 Definition

 

mist coolant

ON
Term

Lathe

M8

 Definition

 

flood coolant 

ON
Term

Lathe

M9

 Definition

 

coolant 

OFF
Term

Lathe

M10

 Definition

 

chuck open
Term

Lathe

M11

 Definition

 

chuck closed
Term

Lathe

M12

 Definition

 

tailstock quill 

IN
Term

Lathe

M13 (1)

 Definition

 

tailstock quill 

OUT
Term

Lathe

M13 (2)

 Definition

 

M3 & M8
Term

Lathe

M14

 Definition

 

M4 & M8
Term

Lathe

M15

 Definition

 

M5 & M8
Term

Lathe

M17

 Definition

 

turret indexer 

FORWARD
Term

Lathe

M18

 Definition

 

turret indexer

REVERSE
Term

Lathe

M19

 Definition

 

spindle orientation
Term

Lathe

M21

 Definition

 

tailstock 

FORWARD
Term

Lathe

M22

 Definition

 

tailstock 

BACKWARD
Term

Lathe

M30

 Definition

 

end of program

(always w/ reset & rewind)
Term

Lathe

M41

 Definition

 

LOW gear selection
Term

Lathe

M42

 Definition

 

HIGH gear selection
Term

Lathe

M52

 Definition

 

unload last tool from spindle
Term

Lathe

M71

 Definition

 

barfeeder 

ON
Term

Lathe

M72

 Definition

 

barfeeder

OFF
Term

Lathe

M73

 Definition

 

parts catcher 

ADVANCE
Term

Lathe

M74

 Definition

 

parts catcher

RETRACT
Term

Lathe

M97

 Definition

 

local sub-program
Term

Lathe

M98

 Definition

 

exit to sub-program
Term

Lathe

M99

 Definition

 

return to main program
Term

Lathe

G0

 Definition

 

rapid transverse
Term

Lathe

G1

 Definition

 

linear interpolation
Term

Lathe

G2

 

 

 Definition

circular interpolation

CW
Term

Lathe

G3

 

 Definition

circular interpolation

CCW
Term

Lathe

G4

 Definition

 

dwell
Term

Lathe

G9

 Definition

 

exact stop

(non-modal)
Term

Lathe

G18

 Definition

 

select ZX plane
Term

Lathe

G20

 Definition

 

programming in inches
Term

Lathe

G21

 Definition

 

programming in milimeters
Term

Lathe

G22

 Definition

 

stored stroke limit 

ON
Term

Lathe

G23

 Definition

 

stored stroke limit 

OFF
Term

Lathe

G28

 Definition

 

return to home
Term

Lathe

G32

 

 

 Definition

 

threading:

Constant Lead
Term

Lathe

G35

 Definition

 

circular threading:

CW
Term

Lathe

G36

 Definition

 

circular threading:

CCW
Term

Lathe

G40

 Definition

 

cancel TNR comp
Term

Lathe

G41

 Definition

 

Instate TNR comp

LEFT
Term

Lathe

G42

 Definition

 

instate TNR comp

Right
Term

Lathe

G50 (1)

 Definition

 

maximum spindle speed
Term

Lathe

G50 (2)

 Definition

 

position register 

(programming of vector from part zero to tool tip)
Term

Lathe

G53

 Definition

 

machine coordinate system
Term

Lathe

G54

 

 Definition

 

work coordinate offset #1
Term

Lathe

G55

 Definition

 

work coordinate offset #2
Term

Lathe

G61

 Definition

 

exact stop

(modal)
Term

Lathe

G64

 

 Definition

 

cutting mode
Term

Lathe

G70

 Definition

 

finish cycle
Term

Lathe

G71

 Definition

 

roughing cycle:

Z axis
Term

Lathe

G72

 Definition

 

roughing cycle:

X axis
Term

Lathe

G73

 Definition

 

roughing:

Multiple repetitive cycle w/ pattern repetition
Term

Lathe

G75

 Definition

 

grooving cycle
Term

Lathe

G74

 Definition

right hand tapping cycle / peck drilling cycle

 
Term

Lathe

G75

 Definition

 

grooving cycle
Term

Lathe

G76

 Definition

 

threading cycle:

Multiple repetitive 
Term

Lathe

G80

 Definition

 

cancel canned cycle
Term

Lathe

G83

 Definition

 

peck drilling cycle

(full retraction from pecks)
Term

Lathe

G90

 

 Definition

 

absolute coordinates
Term

Lathe

G91

 Definition

 

incremental coordinates
Term

Lathe

G92 (1)

 Definition

 

position register 

(programming of vector from part zero to tool tip)
Term

Lathe

G92 (2)

 Definition

 

thread cutting

(simple cycle)
Term

Lathe

G96

 Definition

 

constant surface speed
Term

Lathe

G97

 Definition

 

RPM mode
Term

Lathe

G98

 Definition

 

feed in IPM
Term

Lathe

G99

 Definition

 

feed in IPR
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