Programming and Operating Manual (Milling)
204
6FC5398-4DP10-0BA1, 01/2014
Function
Use this cycle to machine circular pockets in the machining plane. For finishing, a face cutter is required.
The depth infeed always starts at the pocket center point and be performed vertically from there; thus it is practical to predrill
at this position.
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The milling direction can be determined either using a G command (G2/G3) or from the spindle direction as synchronous
or up-cut milling.
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For solid machining, the maximum infeed width in the plane can be programmed.
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Finishing allowance also for the pocket base.
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Two different insertion strategies:
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vertically to the pocket center
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along a helical path around the pocket center
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Shorter approach paths in the plane for finishing
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Consideration of a blank contour in the plane and a blank dimension at the base (optimum machining of preformed
pockets possible).
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_MIDA is recalculated during edge machining.
Sequence
Position reached prior to cycle start:
Starting position is any position from which the pocket center point can be approached at the height of the retraction plane
without collision.
Motion sequence when roughing (_VARI=X1):
With G0, the pocket center point is approached at the retraction level, and then, from this position, with G0, too, the
reference plane brought forward by the safety clearance is approached. The machining of the pocket is then carried out
according to the selected insertion strategy, taking into account the programmed blank dimensions.
Sequence of motions when finishing:
Finishing is performed in the order from the edge until the finishing allowance on the base is reached, and then the base is
finished. If one of the finishing allowances is equal to zero, this part of the finishing process is skipped.
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Finishing on the edge
While finishing on the edge, the tool traverses around the pocket contour only once.
For finishing on the edge, the path includes one quadrant reaching the pocket radius. The radius of this path is 2 mm as
the maximum or, if "less space" is provided, equals to the difference between the pocket radius and the milling 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.
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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 all safety clearance. From this point onwards, the tool is always fed in vertically at the
depth (since a tool with a front cutting edge is used for base finishing).
The base surface of the pocket is machined once.
Insertion strategies
Refer to Section "Milling a rectangular pocket - POCKET3 (Page 197)".
Taking into account the blank dimensions
During solid machining of the pockets, it is possible to take into account blank dimensions (e.g. when machining precast
parts).
With circular pockets, the blank dimension _AP1 is also a circle (with a smaller radius than the pocket radius).
