Siemens SINUMERIK 840D Programming Manual page 171

3
12.97
10.00
If the radius is less than the tool radius of the active
tool, the cycle is aborted after alarm 61105 "Milling
cutter radius too large" is output.
_PA, _PO (pocket center point)
With parameters _PA and _PO you define the center
point of the pocket. Circular pockets are always
measured from the center.
_VARI (machining mode)
You can define the type of machining with parameter
_VARI.
Possible values are:
Units digit:
• 1=Roughing
• 2=Finishing
Tens digit (infeed):
• 0=Perpendicular to the pocket center with G0
• 1=Perpendicular to the pocket center with G1
• 2=Along a helical path
If another value has been programmed for
parameter _VARI, the cycle is aborted after alarm
61002 "Machining type incorrectly defined" is output.
Rough cutting only edge with POCKET4 (SW 5.3
and higher)
POCKET4 (circular pocket) can now machine only the
edge when rough-cutting.
Define the rough dimension in the depth (parameter _AD)
so that it is at least the same size as the pocket depth
(DP) minus the final machining allowance depth (_FALD).
Example:
Condition: depth calculation without including safety
distance (_ZSD[1]=1)
_RTP=0
_SDIS=2
_DP=-21
_FALD=1.25
à_AD ≥ 19.75
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
3.10 Milling circular pockets – POCKET4
reference plane
safety distance
pocket depth
depth allowance
rough dimension for depth
must be greater or equal to pocket
depth incremental minus depth
allowance, i.e. 21-1.25=19.75
3
Milling Cycles
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