Siemens SINUMERIK 840D Programming Manual page 152

Milling Cycles 03.96
3 3
12.97
3.10 Milling circular pockets - POCKET4
Sequence of operations
Y
Position reached prior to cycle start:
_PA
This can be any position from which the starting
position on the center point of the pocket at the
retraction plane level can be approached without
collision.
G2
G3
Motion sequence when roughing (VARI=X1):
With G0, the pocket center point is approached at the
retraction plane level and then, from this position, with
G0 the reference plane brought forward by the safety
clearance is approached. Pocket machining is then
X
performed according to the selected insertion strategy
and considering the programmed blank dimensions.
Insertion strategies:
see Section 3.9 (POCKET3)
Accounting for blank dimensions
During solid machining, it is possible to take blank
dimensions (for example, in the machining of
precast workpieces) into account.
For circular pockets, the basic size _AP1 at the edge
is also circular (with a smaller radius than the pocket
radius).
For additional explanations see Section 3.9
(POCKET3)
 Siemens AG 2000 All rights reserved.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition