HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 132)

132 Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.3 CIR
C
ULAR POCKET (Cy
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5.3 CIRCULAR POCKET (Cycle 252,
DIN/ISO: G252, Advanced
Programming Features
Software Option)
Cycle run
Use Cycle 252 CIRCULAR POCKET to completely 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 tool plunges into the workpiece at the pocket center and
advances to the first plunging depth. Specify the plunging strategy
with Parameter Q366.
2 The TNC roughs out the pocket from the inside out, taking the
overlap factor (Parameter Q370) and the finishing allowances
(parameters Q368 and Q369) into account.
3 At the end of the roughing operation, the TNC moves the tool
tangentially away from the pocket wall, then moves by the setup
clearance above the current pecking depth and returns from there
at rapid traverse to the pocket center.
4 This process is repeated until the programmed pocket depth is
reached.
Finishing
5 Inasmuch as finishing allowances are defined, the TNC then
finishes the pocket walls, in multiple infeeds if so specified. The
pocket wall is approached tangentially.
6 Then the TNC finishes the floor of the pocket from the inside out.
The pocket floor is approached tangentially.