Motion Sequence When Finishing (Vari=X2) - Siemens SINUMERIK 840D Programming Manual

Milling Cycles
3
3.9 Milling rectangular pockets - POCKET3

Motion sequence when finishing (VARI=X2)

Finishing is performed in sequence from the edge
until reaching the finishing allowance on the base,
then the base is finished. If one of the finishing
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
quadrant reaching the corner radius. The radius of
this path is normally 2 mm or, if "less room" is
available, equals the difference between the corner
radius and the mill radius.
If the finishing allowance on the edge is larger than 2
mm, the approach radius is increased accordingly.
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 +
finishing allowance + safety clearance. 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.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
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