Rectangular Pocket - HEIDENHAIN TNC 320 User Manual

5.2 RECTANGULAR POCKET

(Cycle 251, DIN/ISO: G251)
Cycle run
Use Cycle 251 RECTANGULAR POCKET to completely machine
rectangular 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.
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