HEIDENHAIN TNC 426 B User Manual page 86

Tool radius R
You can enter the tool radius R directly.
Delta values for lengths and radii
Delta values are offsets in the length and radius of a tool.
A positive delta value describes a tool oversize (DL, DR, DR2>0). If
you are programming the machining data with an allowance, enter
the oversize value in the TOOL CALL block of the part program.
A negative delta value describes a tool undersize (DL, DR, DR2<0).
An undersize is entered in the tool table for wear.
Delta values are usually entered as numerical values. In a TOOL
CALL block, you can also assign the values to Q parameters.
Input range: You can enter a delta value with up to ± 99.999 mm.
Entering tool data into the program
The number, length and radius of a specific tool is defined in the
TOOL DEF block of the part program.
To select tool definition, press the TOOL DEF key.
Enter the Tool number: Each tool is uniquely identified
by its number.
Enter the tool length: Enter the compensation value
for the tool length.
Enter the Tool radius.
In the programming dialog, you can transfer the value for
tool length directly into the input line with the actual-
position-capture key. You only need to make sure that the
highlight in the status display is placed on the tool axis.
Resulting NC block:
TOOL DEF 5 L+10 R+5
70
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R
L
DR>0
DL<0
DL>0
R
DR<0
5 Programming: Tools