HEIDENHAIN iTNC 530 (340 49x-05) ISO programming - Manual (Page 180)

180 Programming: Tools
5.3 T
ool Compensation
Entering radius compensation
Radius compensation is entered in a G01 block:
To select tool movement to the left of the
programmed contour, select function G41, or
To select tool movement to the right of the contour,
select function G42, or
To select tool movement without radius
compensation or to cancel radius compensation,
select function G40.
To terminate the block, press the END key.