HEIDENHAIN TNC 620 User Manual page 202

7
Fixed Cycles: Contour Pocket
7.6 ROUGHING (Cycle 22, DIN/ISO: G122)
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
Fine rough strategy Q404: Specify the fine
roughing behavior of the TNC if the radius of the
fine roughing tool is greater than half the diameter
of the rough-out tool:
Q404=0:
The TNC moves the tool between the areas to be
fine roughed at the current depth along the contour
Q404=1:
The TNC retracts the tool to the set-up clearance
between the areas to be fine roughed and then
moves to the starting point for the next area to be
roughed out.
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HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015