The tip of a lathe tool has a certain radius (RS). During the machining of tapers, chamfers and radii, this results in distortions on the contour because the programmed traverse paths are referenced to the theoretical tool tip S. Tooth radius compensation (TRC) prevents the resulting deviations.
Application
Related topics
- Tool data of turning tools
- Radius compensation with RR and RL in milling mode
Requirement
- Combined milling/turning (software option 50)
- Required tool data defined for the tool type
Description of function
The control checks the cutting geometry with the point angle P-ANGLE and the setting angle T-ANGLE. Contour elements in the cycle are processed by the control only as far as this is possible with the specific tool.
In the turning cycles, the control automatically carries out tool radius compensation. In specific traversing blocks and within programmed contours, activate TRC with RL or RR.

Theoretical and virtual tool tip

The theoretical tool tip is active in the tool coordinate system. When the tool is inclined, the position of the tool tip rotates with the tool.

To activate the virtual tool tip, use FUNCTION TCPM with the REFPNT TIP-CENTER selection item. Correct tool data are required for calculating the virtual tool tip.
Compensating for the tool angle of inclination with FUNCTION TCPM (option 9)
The virtual tool tip is active in the workpiece coordinate system. When the tool is inclined, the virtual tool tip remains unchanged as long as the tool orientation TO is the same. The control automatically switches the status display TO and thus also the virtual tool tip if the tool leaves the angle range valid for TO 1, for example.
The virtual tool tip enables you to perform inclined paraxial longitudinal and transverse machining operations with high contour accuracy even without radius compensation.
Notes


- The direction of the radius compensation is not clear when the tool-tip position (TO=2, 4, 6, 8) is neutral. In this case, TRC is only possible within fixed machining cycles.
- Tooth radius compensation is also possible during inclined machining.
- Active miscellaneous functions limit the possibilities here:
- With M128 tool-tip radius compensation is possible only in combination with machining cycles
- M144 or FUNCTION TCPM with REFPNT TIP-CENTER also allows tooth radius compensation with all positioning blocks, e.g. with RL/RR
- The control displays a warning when residual material is left behind due to the angle of the secondary cutting edges. You can suppress this warning with the machine parameter suppressResMatlWar (no. 201010).