HEIDENHAIN TNC 620 (73498x-02) ISO programming - Manual (Page 172)

Programming: Tools
5.3 Tool compensation
5
172
TNC 620 | User's Manual for DIN/ISO Programming | 5/2013
Tool radius compensation
The block for programming a tool movement contains:
G41 or G42 for radius compensation
G40 if there is no radius compensation
Radius compensation becomes effective as soon as a tool is called
and is moved with a straight line block in the working plane with
G41 or G42.
The TNC automatically cancels radius compensation
if you:
program a straight line block with
G40
program a
PGM CALL
Select a new program with PGM MGT
For radius compensation, the TNC takes the delta values from both
the
T block and the tool table into account:
Compensation value = R + DR
TOOL CALL
+ DR
TAB
where
R: Tool radius R from the G99 block or tool table
DR
TOOL CALL
: Oversize for radius
DR in the T block
DR
TAB
: Oversize for radius
DR in the tool table
Contouring without radius compensation: G40
The tool center moves in the working plane along the programmed
path or to the programmed coordinates.
Applications: Drilling and boring, pre-positioning