Siemens SINUMERIK 840D Programming Manual page 146

3
Milling Cycles
3.6 Circumferential slot – SLOT2
New machining types in SW 6.3 and higher:
Finishing the edge only (VARI=x3)
• There is a new selection "Finishing the edge". This is
the only machining type where the diameter of the
cutter is allowed to be less than half the slot width.
There is no checking of whether it is sufficiently large
to execute the final machining allowance FAL.
• A number of depth infeeds are possible. These are
programmed as usual by parameter MID. The slot is
circumnavigated once at each depth.
• To approach and return from the contour, the cycle
generates a smooth approach to the segment of the
circular path.
Intermediate positioning on the circular path
(VARI=1x)
• Especially when used on turning machines, it can
happen that there will be a spigot in the middle of the
circle on which the slots lie, that does not allow one
slot to be positioned directly to the next with G0.
• The circular path is taken to be the circle on which
the slots lie (determined by parameters CPA, CPO
and RAD). Positioning takes place at the same level
as intermediate positioning on a straight line with G0.
The positioning feedrate for the circular path is
programmed under the parameter in mm/min.
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SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
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12.97
11.02
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