HEIDENHAIN iTNC 530 (340 49x-03) User Manual
Page 306
306
7 Programming: Miscellaneous-Functions
7.
4 Miscellaneous F
u
nctions f
o
r Cont
our
ing Beha
vior
Automatically retract tool from the contour at an
NC stop: M148
Standard behavior
At an NC stop the TNC stops all traverse movements. The tool stops
moving at the point of interruption.
Behavior with M148
The TNC retracts the tool by 0.1 mm in the direction of the tool axis if,
in the LIFTOFF column of the tool table, you set the parameter Y for the
active tool (see “Tool table: Standard tool data” on page 188).
LIFTOFF takes effect in the following situations:
An NC stop triggered by you
An NC stop triggered by the software, e.g. if an error occurred in the
drive system
When a power interruption occurs
Effect
M148 remains in effect until deactivated with M149.
M148 becomes effective at the start of block, M149 at the end of
block.
The M148 function must be enabled by the machine tool
builder.
Remember that, especially on curved surfaces, the
surface can be damaged during return to the contour. Back
the tool off before returning to the contour!