HEIDENHAIN TNC 620 (340 56x-02) - Manual (Page 150)

150 Programming: Tools
5.3 T
ool Compensation
Contouring with radius compensation: RR and RL
The tool center moves along the contour at a distance equal to the
radius. “Right” or “left” are to be understood as based on the
direction of tool movement along the workpiece contour. See figures.
X
Y
RL
X
Y
RR
RR The tool moves to the right on the programmed contour
RL The tool moves to the left on the programmed contour
Between two program blocks with different radius
compensations RR and RL you must program at least one
traversing block in the working plane without radius
compensation (that is, with R0).
The TNC does not put radius compensation into effect
until the end of the block in which it is first programmed.
In the first block in which radius compensation is activated
with RR/RL or canceled with R0 the TNC always positions
the tool perpendicular to the programmed starting or end
position. Position the tool at a sufficient distance from the
first or last contour point to prevent the possibility of
damaging the contour.