Rectangular pocket (cycle 251) – HEIDENHAIN iTNC 530 (340 49x-04) User Manual
Page 411

HEIDENHAIN iTNC 530
411
8.6 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
RECTANGULAR POCKET (Cycle 251)
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 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.