Siemens SINUMERIK 840D Programming Manual page 213

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3.15 Pocket milling with islands – CYCLE73, CYCLE74, CYCLE75
_RFP and _RTP (reference plane and retraction plane)
The reference plane (RFP) and retraction plane are
generally set to different values. In the cycle it is
assumed that the retraction plane lies in front of the
reference plane. The distance between the retraction
plane and the final drilling depth is therefore greater
than the distance between the reference plane and
the final drilling depth.
_SDIS (safety distance)
The safety distance (SDIS) is effective with regard to
the reference plane which is brought forward by the
safety distance. The direction in which the safety
distance is active is automatically determined by the
cycle.
_DP (absolute pocket depth) and
_DPR (incremental pocket depth)
The pocket depth can be specified as either an absolute
value (_DP) or relative value (_DPR) in relation to the
reference plane. If the incremental option is selected,
the cycle automatically calculates the depth on the basis
of the reference and retraction plane positions.
_MID (maximum infeed depth)
The maximum infeed depth is defined with this
parameter. The depth infeed is performed by the cycle
in equally sized infeed steps.
The cycle calculates this infeed automatically on the
basis of _MID and the total depth.
The minimum possible number of infeed steps is used
as the basis. _MID=0 means that the cut to pocket
depth is made with one infeed.
_MIDA (max. infeed depth in the plane)
With this parameter you define the maximum infeed
width for solid machining in the plane. This value is
never exceeded.
If this parameter is not programmed, or if its value is
0, the cycle uses 80 percent of the mill radius as the
maximum infeed width.
If an infeed width of more than 80 percent of the mill
diameter is programmed, the cycle is aborted after
output of alarm 61982 "Infeed width in plane too large".
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
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Milling Cycles
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