HEIDENHAIN TNC 620 User Manual page 220

5
Tools
5.3 Tool compensation
5.3 Tool compensation
Introduction
The TNC adjusts the tool path by the compensation value for
the tool length in the spindle axis. In the machining 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
including the rotary axes.
Tool length compensation
Length compensation becomes effective automatically as soon as
a tool is called. To cancel length compensation, call a tool with the
length L=0 (e.g. T 0).
Danger of collision!
If you cancel a positive length compensation with T
0 the distance between tool and workpiece will be
reduced.
After T the path of the tool in the spindle 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 control takes the delta values
from both the T block and the tool table into account:
Compensation value = L + DL
L: Tool length L from G99 block or tool table
DL : Oversize for length DL in the T block
CALL T block
DL Oversize for length DL in the tool table
:
TAB
220
+ DL
with
CALL T block TAB
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016