
3.INTERPOLATION FUNCTION NC FUNCTION B-63942EN/02
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3.30 REFERENCE POSITION RETURN
3.30.1 Automatic Reference Position Return
- Return to reference position (G28)
With the G28 command, the commanded axis is positioned to the
reference position via the commanded intermediate point. After
positioning, the reference position return end lamp lights.
The reference position must be set in parameter (with the coordinates
specified in the machine coordinate system,) before issuing the G28
command.
The tool moves to the intermediate point or reference position at the
rapid traverse rate.
For the tool path up to the intermediate point, a selection can be made
between nonlinear interpolation type positioning or linear
interpolation type positioning.
Intermediate point
Nonlinear interpolation type positioning
Start point
Linear interpolation type positioning
Nonlinear interpolation
type positioning
Reference position
By parameter setting, linear interpolation positioning can be specified
also for the tool path from the intermediate point to the reference
position.
Format
G28 IP_ ;
IP_ : Specify the intermediate position in the absolute
coordinate system.
(absolute/incremental programming)
There is no need to calculate an actual travel distance
between the intermediate position and the reference
position.