HEIDENHAIN CNC Pilot 4290 Pilot - Manual (Page 93)

93
Other G F
unctions
Look-ahead G918
Look-ahead control can be switched On/Off with G918. G918 is
programmed in a separate NC block before/after thread machining
(G31, G32, G33).
Parameters
Q:
Look-ahead On/Off – default: 1
nÿ Q=0: off
nÿ Q=1: on
Spindle override 100% G919
The spindle override function can be switched On/Off with G919.
Parameters
Q:
Spindle number – default: 0
H: Type of limit – default: 0
■ H=0: switch on spindle override
■ H=1: switch spindle override to 100% – modular
■ H=2: switch spindle override to 100% – for the current NC
block
Zero point shifts, deactivating tool
lengths G921
G921 ”deactivates” the workpiece datum, all datum
shifts and the tool dimensions. Traverse paths and
position values are referenced to the distance slide
reference point – machine datum.
Deactivating zero point shifts G920
G920 deactivates the workpiece zero point and all zeto point shifts. Tra-
verse paths and position values are referenced to the distance tool tip
– machine datum.
Zero point shifts, activating tool lengths
G981
G981 activates the workpiece datum, all datum shifts
and the tool dimensions.
Traverse paths and position values are now
referenced to the distance tool tip – workpiece
datum, while taking the datum shifts into
consideration.
Activate zero point shifts G980
G980 activates the workpiece datum and all datum
shifts.
Traverse paths and position values are now
referenced to the distance tool tip – workpiece
datum, while taking the datum shifts into
consideration.