HEIDENHAIN TNC 320 User Manual page 276

Cycle programming

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Influences of the geometry definition in the

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.

Cycles: Special Functions

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