HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 134)

134 Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.3 CIR
C
ULAR POCKET (Cy
c
le 252, DIN/ISO: G252)
5.3 CIRCULAR POCKET (Cycle 252,
DIN/ISO: G252)
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 set-up
clearance above the current infeed 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.