HEIDENHAIN TNC 620 User Manual page 221

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
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
R: Tool radius R from G99 block or tool table
DR :Oversize for radius DR in the T block
CALLT block
DR Oversize for radius DR in the tool table
:
TAB
Contouring without radius compensation: G40
The tool center moves on the machining plane along the
programmed path orto the programmed coordinates.
Applications: Drilling and boring, pre-positioning
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
+ DR
with
CALLT block TAB
Tool compensation
5
5.3
221