HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 596)

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Finishing – Tool tolerances
Approach and departure are in rapid traverse (G0).
Finishing – Machining analysis
Approach and departure
„ Approach – external finishing [ANFA]
„ Approach – internal finishing [ANFI]
„ Departure – external finishing [ABFA]
„ Departure – internal finishing [ABFI]
Approach/departure strategy:
„ 1: Move simultaneously in X and Z directions
„ 2: First X, then Z direction
„ 3: First Z, then X direction
„ 6: Coupled motion; X precedes Z direction
„ 7: Coupled motion; Z precedes X direction
Machining analysis
Minimum finishing transverse length [FMPL]
TURN PLUS checks the frontmost element of the outside
contour to be finish-machined. The following rules apply:
„ Without inside contour: Always with additional transverse
cut
„ With inside contour – FMPL >= l1: Without additional
transverse cut
„ With inside contour – FMPL < l1: With additional transverse
cut
Maximum finishing cut depth [FMST]
FMST defines the permissible infeed depth for non-machined
undercuts. The finishing cycle (G890) uses this parameter to
determine whether undercuts (type E, F, G) will be machined
with a contour-finishing operation. The following rules apply:
„ FMST > ft: With undercut machining (ft: undercut depth)
„ FMST <= ft: Without undercut machining
Number of revolutions for chamfer or rounding [FMUR]
The feed rate is reduced such that at least FMUR revolutions
can be executed (evaluation: finishing cycle G890).
The following rules apply to FMPL:
„ The additional transverse cut is executed from the
outside toward the inside.
„ The “Transverse angle variation PWA” has no effect on
the analysis of the transverse elements.