Siemens SINUMERIK 840D Programming Manual page 211

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3.15 Pocket milling with islands – CYCLE73, CYCLE74, CYCLE75
When the current depth for the infeed (these may be
several revolutions on the helical path) has been
calculated, a full circle is made to remove the slope
on insertion.
Then pocket solid machining starts in this plane and
continues until reaching the final machining
allowance.
• Insertion with oscillation (_VARI=XX3X)
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 _RAD, 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.
Hundreds digit: (_VARI=X1XX)
• 0=To retraction plane (_RTP)
• 1=By safety distance (_SDIS) via reference plane
(_RFP).
Thousands digit: (_VARI=1XXX)
• 1=Start point automatic
• 2=Start point manual.
When the starting point is selected automatically, the
cycle internally calculates the starting point for
machining itself.
Notice: Manually specified start positions must not be
too close to the island surface. Manually specified start
positions are not monitored internally.
If the pocket has to be split as a result of the island
position and the mill diameter used, then several start
points are calculated automatically.
With manual start point selection, parameters _PA and
_PO must also be programmed. However, these can
only define one start point.
If the pocket has to be split, the required start points are
calculated automatically.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Milling Cycles
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Starting
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Starting
Residual
point 1
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