HEIDENHAIN iTNC 530 439
11.5 Global Program Settings (software option)
Additional data range:
Lift-off height:
Set-up clearance by which the TNC moves the tool in the direction
of the positive tool axis if a position exceeds a limit plane. Effect
of the value is incremental. If you have entered 0 here, the tool
stops at the point of exit.
Approach clearance:
Advance stop distance to which the TNC positions the tool once
the tool has returned to within the traverse range. The effect of
the value is incremental on the point of reentry.
Positioning logic
The TNC uses the following positioning logic to move between the
point of exit and the point of reentry:
If defined, the TNC retracts the tool by the lift-off height in the
positive machine-axis direction. If tilting of the working plane is
active, (PLANE function), the TNC retracts the tool in the active tool-
axis direction by the Lift-off height.
Then the TNC positions the tool on a straight line to the point of
reentry. If defined, the TNC moves the point of reentry by the
Approach clearance in the positive tool-axis direction.
Then the TNC moves the tool to the point of reentry and continues
running the program
Danger of collision!
Please note that with M128 (FUNCTION TCPM) active and
tilted head axes, the TNC always retracts the tool in the
machine axis Z by the Lift-off height.