HEIDENHAIN TNC 640, User Manual, Page: 496 / 948

Miscellaneous Functions | Miscellaneous functions for path behavior
11
496
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Example
Block 250: Retract the tool 50 mm from the contour.
Block 251: Move the tool to the limit of the traverse range.
250 L X+0 Y+38.5 F125 M140 MB 50 F750
251 L X+0 Y+38.5 F125 M140 MB MAX
M140
is also effective if the
Tilt working plane
function
is active. For machines with swivel heads the control
then moves the tool in the tilted coordinate system.
With
M140 MB MAX
you can only retract in the positive
direction.
Always define a tool call with tool axis before
M140
,
otherwise the traverse direction is not defined.
NOTICE
Danger of collision!
If you use the
M118
function to modify the position of a
rotary axis with the handwheel and then execute the
M140
function, the control ignores the superimposed values with the
retraction movement. This results in unwanted and unpredictable
movements, especially when using machines with head rotation
axes. There is a danger of collision during these compensating
movements!
Do not combine
M118
with
M140
when using machines with
head rotation axes.