HEIDENHAIN iTNC 530 (340 49x-02) ISO programming - Manual (Page 324)

324 8 Programming: Cycles
8.4 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
RECTANGULAR POCKET (Cycle G251)
Use Cycle G251 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 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 allowance
(Parameter 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 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.
With an inactive tool table you must always plunge
vertically (Q366=0) because you cannot define a plunging
angle.