The G93 command is used to set the current feed rate mode to inverse time mode.

In inverse time mode, the F value defines the time taken to complete a move, rather than a linear feed rate.

G93 is a modal command and belongs to Group 5.

Syntax & Parameters

The G93 command enables inverse time feed rate mode.

The X, Y, Z, A, and B values define the destination coordinates for the axes being moved.

The F value defines the feed rate in inverse time. The commanded move will be completed in 1/F minutes, which is equivalent to 60/F seconds.

When using G01, G02, or G03 while inverse time mode is active, a feed rate must be specified using an F value.

When using G00, no feed rate is required.

Example Program

N10 G93
N20 G01 X1 A1 F30    #This will move TO position X1 A1 in 2 seconds 
N30 G00 X0 A0       #This will Rapid to X0 A0 

In this example, the G93 command sets the feed rate mode to inverse time mode.

The second line moves the X and A axes to X1 and A1, and the move is completed in 2 seconds, because an F value of 30 corresponds to 60 ÷ 30 seconds.

The third line performs a rapid move back to X0 and A0.