HEIDENHAIN iTNC 530 (60642x-04) ISO programming - Manual (Page 206)

206 Programming: Tools
5.3
Tool
compensation
Tool radius compensation
The NC block for programming a tool movement contains:
 G41 or G42 or radius compensation
 G43 or G44, for radius compensation in single-axis movements
 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 If the straight-line
block contains only one coordinate in the tool-axis
direction, then the TNC cancels the radius
compensation but it does not necessarily move
correctly in the working plane.
 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 in the T block (not taken
into account by the position display)
DR
TAB:
Oversize for radius DR in the tool table
Y
X
Z
X
Y