Siemens SINUMERIK 840D sl Operating Manual page 413

Supplementary conditions for plunge cutting
● Roughing
1/2 slot width W - finishing allowance UXY ≤ milling cutter diameter
● Maximum radial infeed
The maximum infeed depends on the cutting edge width of the milling cutter.
● Increment
The lateral increment is calculated on the basis of the required slot width, milling cutter
diameter and finishing allowance.
● Retraction
Retraction involves the milling cutter being retracted at a 45° angle if the wrap angle is less
than 180°. Otherwise, retraction is perpendicular, as is the case with drilling.
● Retraction
Retraction is performed perpendicular to the wrapped surface.
● Safety clearance
Traverse through the safety clearance beyond the end of the workpiece to prevent rounding
of the slot walls at the ends.
Please note that the milling cutter's cutting edge cannot be checked for the maximum radial
infeed.
Machining type, rough finishing
If there is too much residual material on the slot walls, unwanted corners are removed to the
finishing dimension.
Machining type, finishing:
When finishing walls, the milling cutter travels along the slot walls, whereby just like for
roughing, it is again fed in the Z direction, increment by increment. During this process, the
milling cutter travels through the safety clearance beyond the beginning and end of the slot,
so that an even slot wall surface can be guaranteed across the entire length of the slot.
Machining type, edge finishing
Edge finishing is performed in the same way as finishing, except that the last infeed (finish
base) is omitted.
Machining type, finishing base:
When finishing the base, the milling cutter moves backwards and forwards once in the finished
slot.
Machining type, chamfering
Chamfering involves breaking the edge at the upper slot edge.
Milling
Operating Manual, 05/2017, A5E40868956
Programming technological functions (cycles)
10.2 Milling
413