HEIDENHAIN TNC 640 User Manual page 231

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Fixed Cycles: Contour Pocket | ROUGHING (Cycle 22, DIN/ISO: G122)

Q401 Feed rate factor in %?: 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

Q404 Fine roughing strategy (0/1)?: Specify the

fine roughing behavior of the TNC if the radius of

the fine roughing tool is identical or greater than

half the radius of the rough-out tool.

The TNC moves the tool between the areas to

be fine roughed at the current depth along the

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

HEIDENHAIN | User's manual for cycle programming | 10/2017