HEIDENHAIN TNC 620, User Manual

Page: 310 / 521

Testing and running | Miscellaneous functions for path behavior
6
Lifting off the tool automatically from the contour at NC
stop: M148
Standard behavior
In case of an NC stop, the control stops all traverse movements. The
tool stops moving at the point of interruption.
Behavior with M148
Refer to your machine manual.
This function must be configured and enabled by your
machine manufacturer.
In machine parameter
CfgLiftOff
(no. 201400), the
machine manufacturer defines the path the tool is
supposed to traverse for a
LIFTOFF
command. You can
also use machine parameter
CfgLiftOff
to deactivate the
function.
Set the
Y
parameter in the
LIFTOFF
column of the tool table for the
active tool. The control then retracts the tool from the contour by 2
mm max. in the direction of the tool axis.
Further information: "Entering tool data into the table", Page 135
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
When lifting the tool off with
M148
, the control will not
necessarily lift it off in the tool axis direction.
The control uses the
M149
function to deactivate the
FUNCTION LIFTOFF
function without resetting the lift-off
direction. If you program
M148
, the control will activate
the automatic lift-off of the tool in the lift-off direction
defined by the
FUNCTION LIFTOFF
function.
Effect
M148
remains in effect until deactivated with
M149
or
FUNCTION
LIFTOFF RESET
.
M148
becomes effective at the start of the block,
M149
at the end of
the block.
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HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022