HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual page 197

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Feed rate factor in %: Q401: Percentage factor by
which the TNC reduces the machining feed rate(Q12)
as soon as the tool moves within the material over its
entire circumference during roughing. If you use the
feed rate reduction, then you can define the feed rate
for roughing so large that there are optimum cutting
conditions with the path overlap (Q2) specified in
Cycle 20. The TNC then reduces the feed rate as per
your definition at transitions and narrow places, so
the machining time should be reduced in total. Input
range 0.0001 to 100.0000
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Fine-roughing strategy Q404: Specify how the TNC
should move the tool during fine roughing when the
radius of the fine-roughing tool is larger than half the
coarse roughing tool.
Q404 = 0
Move the tool along the contour at the current
depth between areas that need to be fine-roughed.
Q404 = 1
Between areas that need to be fine-roughed,
retract the tool to safety clearance and move to the
starting point of the next area to be rough-milled.
HEIDENHAIN iTNC 530 197