Siemens SINUMERIK 840D Programming Manual page 170

3
Milling Cycles
3.10 Milling circular pockets – POCKET4
Motion sequence when finishing (VARI=X2):
Finishing is performed in sequence from the edge until
reaching the final machining allowance on the base,
then the base is finished. If one of the final machining
allowances is equal to zero, this part of the finishing
process is skipped.
• Finishing on the edge
While finishing on the edge, the pocket is only
machined once.
For finishing on the edge the path includes one
fourth of circle which reaches the pocket radius. The
radius of this path is less or equal to 2mm or, if "less
room" is available, equals the difference between the
pocket radius and the mill radius.
The depth infeed is performed with G0 in the open
towards the pocket center and the starting point of
the approach path is also reached with G0.
• Finishing on the base
During finishing on the base, the machine
performs G0 towards the pocket center until
reaching a distance equal to pocket depth + final
machining allowance + safety distance. From this
point onwards, the tool is always fed in vertically
at the depth infeed feedrate (since a tool with a
front cutting edge is used for base finishing).
The base surface of the pocket is machined once.
Description of parameters
See Subsection 2.1.2. (Drilling, Centering –
CYCLE81) for a description of parameters _RTP,
_RFP, _SDIS
See Section 3.7 (POCKET1) for a description of
parameter _DP.
See Section 3.9 (POCKET3) for a description of
parameters _MID, _FAL, _FALD, _FFP1, _FFD, _CDIR,
_MIDA, _AP1, _AD, _RAD1, _DP1.
See Section 3.2 for cycle setting data _ZSD[1].
_PRAD (pocket radius)
The shape of the circular pocket is determined by
the radius only.
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SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
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