HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 162)

162 Programming: Tools
5.3 T
ool compensation
Tool radius compensation
The NC 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.
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
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.
R
R
G40
G41
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.
R : Tool radius R from the G99 block or tool table
DR
TOOL CALL
: Oversize for radius DR from the T
DR
TAB:
Oversize for radius DR in the tool table
Y
X
Z
X
Y