Siemens SINUMERIK 840D Programming Manual page 132

3 3
Milling Cycles 12.97
3.4 Elongated holes on a circle – LONGHOLE
Description of parameters
Y
CPA
See Subsection 2.1.2. (Drilling, Centering –
CYCLE81) for a description of parameters RTP,
INDA
RFP, SDIS. See Section 3.2 for cycle setting data
_ZSD[1].
STA1
DP and DPR (elongated hole depth)
The elongated hole depth can be defined as either
absolute (DP) or relative (DPR) to the reference plane.
If it is entered as a relative value, the cycle
automatically calculates the correct depth on the
basis of the positions of the reference and retraction
X
planes.
NUM (number)
The number of elongated holes us determined with
the parameter NUM.
LENG (elongated hole length)
The elongated hole length is programmed under LENG.
If it is detected during the cycle run that this length is
less than the cutter diameter, then the cycle is
aborted with alarm 61105 "Cutter radius too large".
MID (infeed depth)
The maximum infeed depth is defined with this
parameter.
The depth infeed is performed by the cycle in equally
sized infeed steps.
Using MID and the total depth, the cycle automatically
calculates this infeed which lies between 0.5x maximum
infeed depth and the maximum infeed 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.
The depth infeed commences at the reference plane
moved forward by the safety distance (as a function
of _ZSD[1]).
FFD and FFP1 (feedrate depth and plane)
Feedrate FFP1 is active for all traversing movements
performed in the plane at feedrate. FFD is active for
infeeds that are perpendicular to this plane.
© Siemens AG, 2002. All rights reserved
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SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition