HEIDENHAIN TNC 370 User Manual page 79

4
Programming
4.2 Tools
d
Oversizes for lengths and radii - delta values
In tool tables and in a TOOL CALL block you can enter so-called delta
values for tool length and radius.
l
Positive delta values: tool oversize
l
Negative delta values: tool undersize
The TNC adds the delta values from the table and the TOOL CALL block.
Applications:
l
Undersize in the tool table for wear
l
Oversize in the TOOL CALL block, for example as a finishing
allowance during roughing.
Delta values can be numerical values, Q parameters (only in a TOOL
CALL block) or the value 0. The maximum permissible oversize or
undersize is +/- 99.999 mm.
Determining tool length with a zero tool
For the sign of the tool length L:
L > L, A positive value means the tool is longer
than the zero tool.
L < L, A negative value means the tool is
shorter than the zero tool.
Fig. 4.2: Tool
lengths can be given as the difference from the zero
tool
-/
Move the zero tool to the reference position in the tool axis (e.g. workpiece surface with Z = 0).
If necessary, set the datum in the tool axis to 0.
Change tools.
I
Move the new tool to the same reference position as the zero tool.
I-
The TNC displays the compensation value for the length L.
--
i
Write the value down and enter it later.
-s-m--------------------------------
Enter the display value by using the "actual position capture" function (see page 4-24).
4-6
TNC 370