HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 427)

HEIDENHAIN TNC 128 427
1
7.2 RECT
ANGULAR POCKET (Cy
c
le 251)
17.2 RECTANGULAR POCKET (Cycle
251)
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.
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 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.
6 Then the TNC finishes the floor of the pocket from the inside out.