HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 274)

274 Cycles: Special Functions
12.5 T
O
LERANCE (Cy
c
le 32, DIN/ISO: G62)
Influences of the geometry definition in the CAM
system
The most important factor of influence in offline NC program creation
is the chord error S defined in the CAM system. The maximum point
spacing of NC programs generated in a postprocessor (PP) is defined
through the chord error. If the chord error is less than or equal to the
tolerance value T defined in Cycle 32, then the TNC can smooth the
contour points unless any special machine settings limit the
programmed feed rate.
You will achieve optimal smoothing if in Cycle 32 you choose a
tolerance value between 110% and 200% of the CAM chord error.
X
Z
T
S
CAM TNC PP