Maintaining The Position Of The Tool Tip When Positioning With Tilted Axes (Tcpm): M128 (Option 9) - HEIDENHAIN TNC 640 User Manual

Multiple-Axis Machining | Miscellaneous functions for rotary axes
Maintaining the position of the tool tip when
positioning with tilted 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 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 tilted axis changes in the program,
the position of the tool tip in relation to the workpiece remains the
same during the tilting process.
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.
Tool retracted before the position of the tilting axis is changed
After M128, you can program a feed rate at which the control will
carry out the compensation movements in the linear axes.
If you want to change the position of the tilting axis with the
handwheel during the program run, use M128 along with M118.
Superimposing handwheel positioning is implemented with active
M128, depending on the setting in the 3D-ROT menu of the Manual
operation operating mode, in the active coordinate system or in
the non-tilted coordinate system.
Programming notes:
Before positioning axes with M91 or M92 and before
a T block, reset the M128 function
To avoid contour damage, you must use only
spherical cutters with M128.
The tool length must refer to the spherical center of
the tool tip.
If M128 is active, the control shows the TCPM
symbol in the status display
The TCPM or M128 function cannot be used in
conjunction with the Dynamic Collision Monitoring
(DCM) function and the additional M118 function
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017
NOTICE
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