Siemens SINUMERIK 840D sl Operating Manual page 418

Programming technology functions (cycles)
8.4 Milling
Supplementary conditions for plunge cutting
● Roughing
● Maximum radial infeed
● Increment
● Retraction
● Retraction
● Safety clearance
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.
418
1/2 slot width W - finishing allowance UXY ≤ milling cutter diameter
The maximum infeed depends on the cutting edge width of the milling cutter.
The lateral increment is calculated on the basis of the required slot width, milling cutter
diameter and finishing allowance.
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 is performed perpendicular to the wrapped surface.
Traverse through the safety clearance beyond the end of the workpiece to prevent
rounding of the slot walls at the ends.
Operating Manual, 03/2013, 6FC5398-8CP40-3BA1
Turning