HEIDENHAIN TNC 620 User Manual page 385

10
Miscellaneous functions for path behavior 10.4
Retraction from the contour in the tool-axis
direction: M140
Standard behavior
In the Program run single block and Program run full sequence
modes, the TNC moves the tool as defined in the machining
program.
Behavior with M140
With M140 MB (move back) you can enter a path in the direction of
the tool axis for departure from the contour.
Input
If you enter M140 in a positioning block, the TNC continues the
dialog and asks for the desired path of tool departure from the
contour. Enter the requested path that the tool should follow when
departing 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 TNC
moves the tool along the entered path at rapid traverse.
Effect
M140 is effective only in the NC block in which M140 is
programmed.
M140 becomes effective at the start of the block.
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HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015