HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 208)

Programming: Programming contours
6.2 Fundamentals of Path Functions
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
Radius compensation
The radius compensation must be in the block in which you
move to the first contour element. You cannot activate radius
compensation in a circle block. It must be activated beforehand in
a straight-line block (see "Path contours - Cartesian coordinates",
page 220).
Pre-position
Danger of collision!
Before running a part program, always pre-position
the tool to prevent the possibility of damaging it or
the workpiece.