HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 139)

CIRCULAR POCKET (Cycle 252, DIN/ISO: G252, software option 19) 5.3
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TNC 620 | User's Manual Cycle Programming | 2/2015
139
5.3 CIRCULAR POCKET (Cycle 252, DIN/
ISO: G252, software option 19)
Cycle run
Use Cycle 252 CIRCULAR POCKET to machine circular pockets.
Depending on the cycle parameters, the following machining
alternatives are available:
Complete machining: Roughing, floor finishing, side finishing
Only roughing
Only floor finishing and side finishing
Only floor finishing
Only side finishing
Roughing
1 The TNC first moves the tool at rapid traverse to the set-up
clearance Q200 above the workpiece.
2 The tool plunges to the first plunging depth at the pocket center.
Specify the plunging strategy with parameter Q366.
3 The TNC roughs out the pocket from the inside out, taking the
overlap factor (Parameter Q370) and the finishing allowance
(Parameters Q368 and Q369) into account.
4 At the end of a roughing operation, the TNC moves the tool
tangentially away from the pocket wall by the set-up clearance
Q200 in the working plane, then retracts the tool by Q200 at
rapid traverse and returns it from there at rapid traverse to the
pocket center.
5 Steps 2 to 4 are repeated until the programmed pocket depth is
reached, taking the finishing allowance Q369 into account.
6 If only roughing is programmed (Q215=1), the tool moves away
from the pocket wall tangentially by the set-up clearance Q200,
then retracts at rapid traverse to the 2nd set-up clearance Q200
in the tool axis and returns at rapid traverse to the pocket center.