HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 176)

176 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 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 page100).
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!
In the CfgLiftOff machine parameter, define the value by
which the tool is to be retracted . In the CfgLiftOff
machine parameter you can also switch off the function.