HEIDENHAIN iTNC 530 (340 49x-04) User Manual
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7 Programming: Miscellaneous Functions
7.
4 Miscellaneous F
unctions f
o
r Cont
our
ing Beha
vior
Example NC blocks
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 tilted-working-plane function,
M114 or M128 is active. On machines with tilting heads,
the TNC then moves the tool in the tilted coordinate
system.
With the FN18: SYSREAD ID230 NR6 function you can find
the distance from the current position to the limit of the
traverse range in the positive tool axis.
With M140 MB MAX you can only retract in positive direction.
Always define a TOOL CALL with a tool axis before entering
M140,
otherwise the direction of traverse is not defined.
When dynamic collision monitoring (DCM) is active, the
TNC might move the tool only until it detects a collision
and, from there, complete the NC program without any
error message. This can result in tool paths different from
those programmed!