HEIDENHAIN SW 68894x-02 - Manual (Page 539)

HEIDENHAIN CNC PILOT 640 539
8.2
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Finishing – Machining analysis
Recessing and contour recessing
Recessing, contour recessing – Approach and departure
Approach and departure are at rapid traverse (G0).
Machining analysis
Minimum finishing transverse length [FMPL]
TURN PLUS checks the frontmost element of the outside
contour to be finish-machined. Remember that:
 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. Remember that:
 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.
Approach and departure
 Approach – external recessing [ANESA]
 Approach – internal recessing [ANESI]
 Departure – external recessing [ABESA]
 Departure – internal recessing [ABESI]
 Approach – external contour recessing [ANKSA]
 Approach – internal contour recessing [ANKSI]
 Departure – external contour recessing [ABKSA]
 Departure – internal contour recessing [ABKSI]