HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 195)

Tool compensation 5.3
5
TNC 620 | User's ManualDIN/ISO Programming | 2/2015
195
Tool radius compensation
The block for programming a tool movement contains:
G41 or G42 for radius compensation
G40 if there is no radius compensation
The radius compensation is effective as soon as a tool is called and
traversed with a straight line block in the working plane with
G41or
G42.
The TNC automatically cancels radius compensation
if you:
program a straight line block with G40
depart the contour with the DEP function
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
T block
+ DR
TAB
with
R: Tool radius R from G99 block or tool table
DR
T block
: 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