Siemens SINUMERIK 840D sl Operating Manual

Also see for SINUMERIK 828D Turning: Diagnostic manual Function manual Equipment manual Programming manual Operating manual

For hard materials, use a lower infeed.Machining type, roughing plunge cuttingRoughing of the slot takes place sequentially along the length of the groove, with the millingcutter performing vertical insertions at the machining feedrate. The milling cutter is thenretracted and repositioned at the next insertion point.The milling cutter moves along the length of the slot, at half the infeed rate, and insertsalternately at the left-hand and right-hand walls.The first insertion motion takes place at the slot edge, with the milling cutter inserted at halfthe infeed, less the safety clearance (if the safety clearance is greater than the infeed, this willbe on the outside). For this cycle, the maximum width of the slot must be less than double thewidth of the milling cutter + the finishing allowance.Following each insertion, the milling cutter is lifted by the height of the safety clearance at themachining feedrate. As far as possible, this occurs during what is known as the retractionprocess, i.e. if the milling cutter's wrap angle is less than 180°, it is lifted at an angle below 45°in the opposite direction to the bisector of the wrap area.The milling cutter then traverses over the material in rapid traverse.Supplementary conditions for plunge cutting● Roughing1/2 slot width W - finishing allowance UXY ≤ milling cutter diameter● Maximum radial infeedThe maximum infeed depends on the cutting edge width of the milling cutter.● IncrementThe lateral increment is calculated on the basis of the required slot width, milling cutterdiameter and finishing allowance.● RetractionRetraction involves the milling cutter being retracted at a 45° angle if the wrap angle is lessthan 180°. Otherwise, retraction is perpendicular, as is the case with drilling.Programming technology functions (cycles)10.4 MillingTurning484 Operating Manual, 05/2017, A5E40868721