HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 106)

90 5 Programming: Tools
5.3 Tool Compensation
The TNC adjusts the spindle path in the tool axis by the
compensation value for the tool length. In the working plane, it
compensates the tool radius.
If you are writing the part program directly on the TNC, the tool
radius compensation is effective only in the working plane. The TNC
accounts for the compensation value in up to five axes (TNC 410:
four axes) including the rotary axes.
Tool length compensation
Length compensation becomes effective automatically as soon as a
tool is called and the tool axis moves. To cancel length
compensation call a tool with the length L=0.
If you cancel a positive length compensation with 0, the
distance between tool and workpiece will be reduced.
After a tool call, the path of the tool in the tool axis, as
entered in the part program, is adjusted by the difference
between the length of the previous tool and that of the
new one.
For tool length compensation, the TNC takes the delta values from
both the T block and the tool table into account.
Compensation value = L + DL
T
+ DL
TAB
, where
L is the tool length L from the G99 block or tool
Table
DL
T
is the oversize for length DL in the T block (not taken
into account by the position display)
DL
TAB
is the oversize for length DL in the tool table
5.3 T
ool Compensation
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