HEIDENHAIN TNC 320 User Manual page 275

12.5 TOLERANCE (Cycle 32,
DIN/ISO: G62)
Cycle function
Machine and TNC must be specially prepared by the
machine tool builder for use of this cycle.
With the entries in Cycle 32 you can influence the result of HSC
machining with respect to accuracy, surface definition and speed,
inasmuch as the TNC has been adapted to the machine's
characteristics.
The TNC automatically smoothens the contour between two path
elements (whether compensated or not). The tool has constant
contact with the workpiece surface and therefore reduces wear on the
machine tool. The tolerance defined in the cycle also affects the
traverse paths on circular arcs.
If necessary, the TNC automatically reduces the programmed feed
rate so that the program can be machined at the fastest possible
speed without short pauses for computing time. Even if the TNC
does not move with reduced speed, it will always comply with
the tolerance that you have defined. The larger you define the
tolerance, the faster the TNC can move the axes.
Smoothing the contour results in a certain amount of deviation from
the contour. The size of this contour error (tolerance value) is set in a
machine parameter by the machine manufacturer. With CYCLE 32 you
can change the pre-set tolerance value and select different filter
settings, provided that your machine tool builder has implemented
these features.
HEIDENHAIN TNC 320 275