Siemens SINUMERIK 840D Programming Manual page 116

Milling Cycles 03.96
3 3
3.4 Elongated holes on a circle - LONGHOLE
Description of parameters
Y
CPA
See Section 2.1.2. (Drilling, Centering – CYCLE81)
for a description of parameters RTP, RFP, SDIS.
INDA
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
planes.
X
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 0.5 x
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 clearance (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.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition