Siemens SINUMERIK 840D Programming Manual page 143

03.96
08.97
3
• Oscillating insertion on center axis of pocket
(VARI=3X)
means that the mill center point oscillates along an
oblique linear path until it has reached the next
current depth. The maximum insertion angle is
programmed under _RAD1, the position of the
oscillation path is calculated within the cycle. When
the current depth has been reached, the path is
traversed again without depth infeed in order to
remove the slope caused by insertion. The feedrate
is programmed through _FFD.
Accounting for blank dimensions
During solid machining, it is possible to take blank
dimensions (for example, in the machining of
precast workpieces) into account.
The basic size for the length and width (_AP1 and
_AP2) are programmed without sign and their
symmetrical positions around the pocket center
computed in the cycle. They define the part of the
pocket that does not have to be solid machined. The
basic size for the depth (_AD) is also programmed
without a sign and computed in the direction of the
pocket depth from the reference plane.
Depth infeed to account for workpiece sizes is
carried out according to the programmed type
(helical path, oscillating, vertical). If the cycle
recognizes that by means of the blank contour and
the radius of the active tool there is enough room in
the pocket center, infeed takes place as long as
possible vertically downwards to the pocket center in
order to avoid time-consuming approach paths in the
open.
The pocket is solid machined beginning from the top
and proceeding in the downward direction.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
3.9 Milling rectangular pockets - POCKET3
Milling Cycles
Y
_AP1 basic size pocket length
3
X
_AP2 basic size
pocket width
3-143