HEIDENHAIN TNC 640 User Manual page 495

Miscellaneous Functions | Miscellaneous functions for path behavior
Retraction from the contour in the tool-axis direction:
M140
Standard behavior
In the Program Run Single Block and Program Run Full Sequence
operating modes, the control moves the tool as defined in the
machining program.
Behavior with M140
With M140 MB (move back), you can retract the tool from the
contour by a programmable distance in the direction of the tool
axis.
Danger of collision!
The machine tool builder has various options for configuring
the Dynamic Collision Monitoring (DCM) function. Depending
on the machine, the NC program will be continued without
an error message despite a detected collision, but the tool
will be stopped at the last position without collision. If the NC
program enables a new position without collision, the control
resumes the machining operation and positions the tool at that
position. This configuration of the Dynamic Collision Monitoring
(DCM) function results in movements that are not defined in
the program. This process takes place no matter whether
collision monitoring is active or inactive.
collision during these movements!
Refer to your machine manual.
Check the behavior at the machine.
Input
If you enter M140 in a positioning block, the control continues
the dialog and prompts you for the path the tool should use for
retracting from the contour. Enter the desired path that the tool
should follow when retracting from the contour, or press the
MB MAX soft key to move to the limit of the traverse range.
In addition, you can program the feed rate at which the tool
traverses the entered path. If you do not enter a feed rate, the
control moves the tool along the entered path at rapid traverse.
Effect
M140 is effective only in the NC block in which itis programmed.
M140 becomes effective at the start of the block.
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
NOTICE
There is a danger of
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