Siemens SINUMERIK 840D Programming Manual page 191

3
12.97
04.00
3.13 Milling rectangular spigots – CYCLE76 (SW 5.3 and higher)
Depth infeed:
• Infeed to safety distance
• Insertion to machining depth
The first machining depth is the product of:
• the total depth,
• the final machining allowance and
• the maximum possible depth infeed.
Sequence of motions for finishing (VARI=X2)
Depending on the setting of parameters _FAL and
_FALD, a finishing operation is performed on the spigot
surface or base or both. The approach strategy
matches the motions in the plane executed for roughing
operations.
Description of parameters
See Subsection 2.1.2. (Drilling, Centering –
CYCLE81) for a description of parameters RTP,
RFP, SDIS, DP, DPR.
See Section 3.9 for a description of parameters
_MID, _FAL, _FALD, _FFP1, _FFD.
See Section 3.2 for cycle setting data _ZSD[2].
_LENG, _WID and _CRAD (spigot length, spigot
width and corner radius)
The shape of a spigot in the plane is determined with
parameters _LENG, _WID and _CRAD.
The spigot can be dimensioned from the center or
from one corner point. When dimensioning from a
corner point, use _LENG and _WID with sign.
The absolute length value (_LENG) always refers to
the abscissa (with a plane angle of zero degrees).
_PA, _PO (reference point)
Parameters _PA and _PO are set to define the
reference point of the spigot in abscissa and ordinate.
This is either the spigot center point or a corner
point. The value of this parameter depends on cycle
setting data bit _ZSD[2]:
• 0 means spigot center point
• 1 means corner point.
When the spigot is dimensioned from a corner, the
length and width parameters must be entered with sign
(_LENG, _WID) so that a unique position for the spigot
is defined.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Milling Cycles
Spigot dimensioned from center point
Y
_PA
_CRAD
Spigot dimensioned from corner point
Y
_PA
3
_STA
X
_STA
X
3-191