Preparatory Function G

Address symbol G represents preparatory function, and it is usually called G command.

Function G is used to specify machining operations, such as the moving track of tool relative to workpiece, machine coordinate system, coordinate plane, tool compensation, coordinate offset, subprogram call, dwell, and so on.

G command has non-modal and modal forms:

• Non-modal function G: only effective in the specified program block.
• Modal function G: a function G remains effective until another function G in the same group appears to cancel it.

Programming Example

G01 X

Z_ 'G01 is effective within such a range

X_

G00 Z_

X_ 'G00 is effective within such a range

G01 X_

...

Attention: G00 and G01 are modal G commands.

• G00 Rapid Positioning

• G01 Linear Interpolation

• G02/G03 Circular Interpolation

• G04 Dwell

• G17/G18/G19 Plane Selection

• G20/G21 or G70/G71 Input in Inch/Metric

• G28 Automatic Returning to Reference Point

• G40/G41/G42 Tool Radius Compensation

• G43/G44/G49 Tool Length Compensation

• G50/G51 Scaling Function

• G50.1/G51.1 Mirroring Function

• G53 Machine Coordinate System

• G54~G59 Selection of WCS

• G68/G69 Rotation Function

• G90 Absolute Programming and G91 Incremental Programming

• G92 Setting Workpiece Coordinate System

• G921 Specifying the Workpiece Coordinates of Current Point

• G922 Specifying the Coordinates of WCS Origin

• G923 Setting Tool Offset

• G992 Setting Temporary WCS