HEIDENHAIN iTNC 530 (340 49x-01) ISO programming - Manual (Page 302)

302 8 Programming: Cycles
8.4 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
CIRCULAR POCKET (Cycle G252)
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 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 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.
With an inactive tool table you must always plunge
vertically (Q366=0) because you cannot define a plunging
angle.