G- and M-Codes for CNC


Commonly used G-Codes...

Here are the most common G-codes with their function called out. The ones highighted in red are appropriate for use on Sherline CNC machines. This list is included near the end of the instructions that come with your Sherline CNC machine. You can also find a complete list on your Sherline computer at Applications>CNC>G-code Quick Reference.

g0 rapid positioning 
g1 linear interpolation 
g2 circular/helical interpolation (clockwise) 
g3 circular/helical interpolation (counterclockwise)

g4 dwell 
g10 coordinate system origin setting 
g17 xy plane selection 
g18 xz plane selection 
g19 yz plane selection
g20 inch system selection 
g21 millimeter system selection
g40 cancel cutter diameter compensation 
g41 start cutter diameter comp. left 
g42 start cutter diameter comp. right
g43 tool length offset (plus) 
g49 cancel tool length offset
g53 motion in machine coordinate system 
g54 use preset work coordinate system 1 
g55 use preset work coordinate system 2 
g56 use preset work coordinate system 3 
g57 use preset work coordinate system 4

g58 use preset work coordinate system 5 
g59 use preset work coordinate system 6 
g59.1 use preset work coordinate system 7 
g59.2 use preset work coordinate system 8 
g59.3 use preset work coordinate system 9 
g80 cancel motion mode (includes canned) 
g81 drilling canned cycle 
g82 drilling with dwell canned cycle 
g83 chip-breaking drilling canned cycle 
g84 right hand tapping canned cycle 
g85 boring, no dwell, feed out canned cycle 
g86 boring, spindle stop, rapid out canned 
g87 back boring canned cycle 
g88 boring, spindle stop, manual out canned 
g89 boring, dwell, feed out canned cycle 
g90 absolute distance mode 
g91 incremental distance mode
g92 offset coordinate systems 
g92.2 cancel offset coordinate systems 
g93 inverse time feed mode 
g94 feed per minute mode 
g98 initial level return in canned cycles

A more complete list of G- and M-Codes...

For those interested, here is a more complete list of common codes.

G00 Rapid move G0 X# Y# Z# up to eight axes or G0 Z# X#

G01 Feed Rate move G1 X# Y# Z# up to eight axes or G1 Z# X#

G02 Clockwise move

G03 Counter Clockwise move

G04 Dwell time G04 L#

G08 Spline Smoothing On

G09 Exact stop check, Spline Smoothing Off

G10 A linear feedrate controlled move with a decelerated stop

G11 Controlled Decel stop




G28 Return to clearance plane

G33 Threading (Lathe)

G35 Bypass error checking on next line

G40 Tool compensation off

G41 Tool compensation to the left

G42 Tool compensation to the right

G43 Tool length compensation - negative direction

G44 Tool length compensation - positive direction

G49 Tool length compensation cancelled

G53 Cancel work coordinate offsets

G54-G59 Work coordinate offsets 1 through 6

G61 Spline contouring with buffering mode off

G64 Spline contouring with buffering mode on

G65 Mill out rectangular pocket

G66 Mill out circular pocket

G67 Flycut

G68 Mill out rectangular pocket with radius corners

G70 Inch mode

G71 Millimeter mode

G74 Peck drilling (Lathe) G83 Z# X# R#

G81 Drill cycle G81 X# Y# Z# R#

G82 Dwell cycle G82 X# Y# Z# R#

G83 Peck cycle G83 X# Y# Z# R#

G84 Tapping cycle G84 X# Y# Z# R# C#

G85 Boring cycle 1 G85 X# Y# Z# R#

G86 Boring cycle 2 G86 X# Y# Z# R#

G88 Boring cycle 3 G88 X# Y# Z# R#

G89 Boring cycle 4 G89 X# Y# Z# R#

G90 Absolute mode

G91 Incremental mode

G92 Home coordinate reset G92 X# Y# Z#

G94 IPM mode (Lathe) default

G95 IPR mode (Lathe)

G96 Constant Surface Feed On (Lathe)

G97 Constant Surface Feed Off (Lathe)

G110 Lathe Groove Face

G111 Lathe Groove OD

G112 Lathe Groove ID

G113 Lathe Thread OD

G114 Lathe Thread ID

G115 Lathe Face Rough

G116 Lathe Turn Rough

G120 Mill Outside Square

G121 Mill Outside Circle or Island

G122 Mill Out Counter Bore

G123 Mill Outside Ellipse pocket

G124 Mill Inside Ellipse pocket

G125 Mill Outside Slot

G126 Mill Inside Slot pocket

G130 3D tool compensation with gouge protection

G131 3D offset parallel to 3D profile

G132 3D tool compensation with gouge protection in the Z axis only

G135 5 axis tool compensation with gouge protection

G136 Included angle limit for gouge protection. G136 L#

G140 3D part rotation and plane tilting G140 U# V# W# R#

G141 Scale factor for the X axis only. G141 L#

G142 Scale factor for the Y axis only. G142 L#

G143 Scale factor for the Z axis only. G143 L#

G160 Mill 3D Cylinder

G162 Mill 3D Sphere

G163 Mill 3D Ramped Plane

G170 Set soft limits and crash fixture/chuck barriers to defaults

G171 Set backward crash fixture/chuck barriers G171 U# V# W#

G172 Set forward crash fixture/chuck barriers G172 U# V# W#

G181 Bolt Hole Drill

G182 Bolt Hole Dwell

G183 Bolt Hole Peck

G184 Bolt Hole TapG185 Bolt Hole Bore

Common M Codes

Default M codes used on most machines types. User customizable M codes will change based on application and user definition.

M02 End of Program

M03 Spindle On Clockwise, Laser, Flame, Power ON

M04 Spindle On Counter Clockwise

M05 Spindle Stop, Laser, Flame, Power OFF

M06 Tool Change

M08 Coolant On

M09 Coolant Off

M10 Reserved for tool height offset

M13 Spindle On, Coolant On

M30 End of Program when macros are used

M91 Readout Display Incremental

M92 Readout Display Absolute

M97 Go to or jump to line number

M98 Jump to macro or subroutine

M99 Return from macro or subroutine

M100 Machine Zero Reset

M199 Mid program start

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