HEIDENHAIN TNC 407 (280 580) User Manual User Manual
Page 66
4-7
TNC 425/TNC 415 B/TNC 407
4
Programming
Fig. 4.5:
Tool lengths are entered as the difference from the zero tool
Fig. 4.4:
Oversizes DL, DR on a toroid cutter
R
DR<0
DR>0
DL<0
R
DL>0
L
Z
X
L
0
L >0
1
L <0
2
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.
• Positive delta values - tool oversize
• Negative delta values- tool undersize
The TNC adds the delta values from the table and
the TOOL CALL block.
Applications
• Undersize in the tool table for wear
• 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. Maxi-
mum 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
0
The tool is longer than the zero tool
L < L
0
The tool is shorter than 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.
Move the new tool to the same reference position as the zero tool.
The TNC displays the compensation value for the length L.
Write the value down and enter it later.
Enter the display value by using the “actual position capture” function (see page 4-30).