CNC Codes

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Here is a quick reference chart of available machine codes. Listed below are "G" "M" and "N" codes used in Milling and Lathing applications and projects. There are great references on the Internet that explain these codes. We were going to replicate them here, but we like to honor those who have worked so hard to provide this education for free to the Internet. Refer to the External links at the bottom for detailed explanations of these codes.


Commonly Used "G" Codes - CNC Mill

G00 - Rapid Positioning

G52 - Local Coordinate Setting

G01 - Feedrate Positioning

G53 - Machine Coordinate Setting

G02 - Arc Clockwise

G54 - Workpiece Coordinate Setting #1

G03 - Arc Counterclockwise

G55 - Workpiece Coordinate Setting #2

G04 - Dwell

G56 - Workpiece Coordinate Setting #3

G05 - High Speed Machining

G57 - Workpiece Coordinate Setting #4

G07 - Imanaginary Axis Designation

G58 - Workpiece Coordinate Setting #5

G09 - Exact Stop Check

G59 - Workpiece Coordinate Setting #6

G10 - Program Parameter Input

G60 - Single Direction Positioning

G11 - Program Parameter Input Cancel

G62 - Automatic Corner Override

G12 - Circle Cutting CW

G63 - Tapping Mode

G13 - Circle Cutting CCW

G64 - Cutting Mode

G17 - X - Y Plane

G65 - Custom Macro Call (Simple)

G18 - X - Z Plane

G66 - Custom Macro Call (Modal)

G19 - Y - Z Plane

G67 - Custom Macro Call Cancel (Modal)

G20 - Input in Inch Units

G68 - Coordinate System Rotation ON

G21 - Input in Metric

G69 - Coordinate System Rotation OFF

G22 - Stored Stroke Limit ON

G70 - Input in Inch Units

G23 - stored Stroke Limit OFF

G71 - Input in Metric Units

G27 - Reference Point Return Check

G73 - High Speed Peck Drilling Cycle

G28 - Automatic Return to Reference Point

G74 - Left Hand Tapping Cycle

G29 - Automatic Return from Reference Point

G76 - Fine Boring Cycle

G30 - Return to 2nd, 3rd or 4th Reference Point

G80 - Canned Cycle Cancel

G31 - Skip Function

G81 - Drilling Cycle (Canned)

G33 - Thread Cutting

G82 - Counter Boring Cycle (Canned)

G34 - Bolt Hole Circle (Canned Cycle)

G83 - Peck Drilling Cycle (Canned)

G35 - Line at Angle (Canned Cycle)

G84 - Right Hand Tapping Cycle (Canned)

G36 - Arc (Canned Cycle)

G85 - Boring Cycle (Canned)

G40 - Cutter Compensation Cancel

G87 - Back Boring Cycle (Canned)

G41 - Cutter Compensation Left

G90 - Absolute Positioning

G42 - Cutter Compensation Right

G91 - Incremental Positioning

G43 - Tool Length Compensation (Plus)

G92 - Reposition Origin Point

G44 - Tool Length Compensation (Minus)

G94 - Feed Per Minute

G45 - Tool Offset Increase

G95 - Feed Per Revolution

G46 - Tool Offset Decrease

G96 - Constant Surface Speed Control

G49 - Tool Length Compensation Cancel

G97 - Constant Surface Speed Control Cancel

G50 - Scaling OFF

G98 - Set Initial Plane (Default)

G51 - Scaling ON

G99 - Return to Rapid Plane

Commonly Used "G" Codes - CNC Lathe

G00 - Rapid Positioning

G57 - Workpiece Coordinate Setting #4

G01 - Feedrate Positioning

G58 - Workpiece Coordinate Setting #5

G02 - Arc Clockwise

G59 - Workpiece Coordinate Setting #6

G03 - Arc Counterclockwise

G61 - Exact Stop Check Mode

G04 - Dwell

G62 - Automatic Corner Override

G07 - Feedrate Sine Curve Control

G63 - Tapping Mode

G10 - Data Setting

G64 - Cutting Mode

G11 - Data Setting Cancel

G65 - User Macro Call

G17 - X - Y Plane

G66 - User Macro Call (Modal)

G18 - X - Z Plane

G67 - User Macro Call Cancel (Modal)

G19 - Y - Z Plane

G70 - Finishing Cycle

G20 - Inch Units

G71 - Turning Cycle

G21 - Metric Units

G72 - Facing Cycle

G22 - Stored Stroke Check ON

G73 - Pattern Repeat

G23 - Stored Stroke Check OFF

G74 - Drilling Cycle

G27 - Reference Point Return Check

G75 - Grooving Cycle

G28 - Automatic Zero Return

G76 - Threading Cycle

G29 - Return from Zero Position

G80 - Canned Cycle Cancel

G30 - 2nd Reference Point Return

G83 - Face Drilling Cycle

G31 - Skip Function

G84 - Face Tapping Cycle

G32 - Thread Cutting

G86 - Face Boring Cycle

G36 - Automatic Tool Compensation

G90 - Absolute Positioning

G40 - Tool Compensation Cancel

G91 - Incremental Positioning

G41 - Tool Compensation Left

G92 - OD Thread Cutting Cycle

G42 - Tool Compensation Right

G94 - Face Turning Cycle

G46 - Automatic Tool Compensation

G96 - Constant Speed Control

G50 - Coordinate System Setting

G97 - Constant Speed Control Cancel

G52 - Local Coordinate System Setting

G98 - Feedrate Per Time

G53 - Machine Coordinate System Setting

G99 - Feedrate Per Revolution

G54 - Workpiece Coordinate Setting #1

G107 - Cylindrical Interpolation

G55 - Workpiece Coordinate Setting #2

G112 - Polar Coordinate Interpolation

G56 - Workpiece Coordinate Setting #3

G113 - Polar Coordinate Interpolation Cancel



Commonly Used "M" Codes - Mill & Lathe

Mill

Lathe

M00 - Program Stop

M00 - Program Stop

M01 - Optional Stop

M01 - Optional Program Stop

M02 - Program End

M02 - Program End

M03 - Spindle Clockwise

M03 - Spindle Clockwise

M04 - Spindle Counter Clockwise

M04 - Spindle Counter Clockwise

M05 - Spindle Stop

M05 - Spindle Stop

M06 - Tool Change


M07 - Thru Spindle Coolant ON

M07 - Flood Coolant #1 On

M08 - Flood Coolant ON

M08 - Flood Coolant #2 On

M09 - Coolant Off (all coolant)

M09 - Coolant Off

M10 - Table Pallet Clamp


M11 - Table Pallet Unclamp


M12 - Shower Coolant On


M14 - Spindle Air Blow On


M15 - Spindle Air Blow Off


M16 - Air Blast / Tool Changer


M18 - Air Blast Off


M19 - Spindle Orientation


M29 - Rigid Tapping


M30 - End Program

M30 - End Progarm

M60 - Pallet Change


M61 - Load Pallet #1


M62 - Load Pallet #2


M98 - Sub Program Call

M98 - Sub Program Call

M99 - Sub Program Cancel

M99 - Sub Program Cancel



External links

Machine Codes - Tormach provides a fantastic layout helping to explain machine codes in detail. They also provide some good books on the subject and while they also provide CNC machines, they are higher priced and purposed for non-hobbyists. But a good team of folks never the less!

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