G0 - Rapid Movement
G1 - Linear Feed Movement
G2 - Clockwise Interpolation - Circular Movement
G3 - Counter Clockwise Interpolation - Circular Movement
G4 - Dwell
G9 - Exact Stop
G10 - Set Data
G17 - XY Machine Plane Selection
G18 - ZX Machine Plane Selection
G19 - YZ Machine Plane Selection
G20 - Machine is Programmed in Inches
G21 - Machine is Programmed in Millimeters
G28 - Return Home (First Reference Position)
G30 - Return to the Second Reference Position
G40 - Cancel the Turning Tool Nose Radius Compensation
G41 - Turning Tool Nose Radius Compensation - Left
G42 - Turning Tool Nose Radius Compensation - Right
G50 - Maximum Spindle Speed Limit
G52 - Local Coordinate System Setting
G53 - Machine Coordinate System Setting
G54 - Work Offset / Work Coordinate System
G55 - Work Offset / Work Coordinate System
G56 - Work Offset / Work Coordinate System
G57 - Work Offset / Work Coordinate System
G58 - Work Offset / Work Coordinate System
G59 - Work Offset / Work Coordinate System
G80 - Cancel a Canned Cycle
G81 - Drilling Canned Cycle
G82 - Drilling Canned Cycle
G83 - Peck Drilling Canned Cycle
G84 - Tapping Canned Cycle
G85 - Boring Canned Cycle
G86 - Boring Cycle
G90 - Absolute Programming
G91 - Incremental Programming
G92 - Thread Cutting Canned Cycle
G96 - Constant Surface Speed Selection
G97 - Spindle Speed Selection
G98 - Feed Rate Per Minute
G99 - Feed Rate Per Revolution