Retaining The Position Of The Tool Tip During The Positioning Of Tilting Axes (Tcpm): M128 (Option 9) - HEIDENHAIN TNC 620 User Manual

Multiple-axis machining | Miscellaneous functions for rotary axes
Retaining the position of the tool tip during the
positioning of tilting axes (TCPM): M128 (option 9)
Standard behavior
If the inclination angle of the tool changes, this results in an offset
of the tool tip compared to the nominal position. The control does
not compensate for this offset. If the operator does not take this
deviation into account in the NC program, offset machining is
executed.
Behavior with M128 (TCPM: Tool Center Point Management)
If the position of a controlled tilting axis changes in the NC program,
then the position of the tool tip relative to the workpiece remains
unchanged.
Danger of collision!
Rotary axes with Hirth coupling must move out of the coupling to
enable tilting. There is a danger of collision while the axis moves
out of the coupling and during the tilting operation.
Retract the tool before changing the position of the tilting axis
After M128, you can still enter a maximum feed rate at which the
control will carry out the compensating movements in the linear
axes.
If you want to change the position of the tilting axis with the
handwheel during program run, then use M128 in conjunction with
M118. The superimposing of handwheel positioning is performed
with active M128, depending on the setting in the 3D ROT menu of
Manual operation mode, in the active coordinate system or in the
non-tilted coordinate system.
Programming notes:
Before positioning with M91 or M92, and before a
TOOL CALL block, reset the M128 function
To avoid contour damage, use only radius cutters with
M128
The tool length must be measured from the spherical
center of the ball-nose cutter
If M128 is active, then the control shows the TCPM
symbol in the status display
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022
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