Siemens SINUMERIK 840D sl Operating Manual page 483

Approach/retraction for plunge cutting
1. The tool moves in rapid traverse to the starting point in front of the slot at the safety
clearance.
2. The open slot is always machined along its entire length using the selected machining
method.
3. The tool retracts to the safety clearance in rapid traverse.
Machining type, roughing vortex milling
Roughing is performed by moving the milling cutter along a circular path.
While performing this motion, the milling cutter is continuously fed into the plane. Once the
milling cutter has traveled along the entire slot, it returns to its starting point, while continuing
to move in a circular fashion. By doing this, it removes the next layer (infeed depth) in the Z
direction. This process is repeated until the set slot depth plus the finishing allowance has
been reached.
Vortex milling: Down-cut or up-cut
Supplementary conditions for vortex milling
● Roughing
1/2 slot width W – finishing allowance UXY ≤ milling cutter diameter
● Slot width
minimum 1.15 x milling cutter diameter + finishing allowance
maximum, 2 x milling cutter diameter + 2 x finishing allowance
● Radial infeed
minimum, 0.02 x milling cutter diameter
maximum, 0.25 x milling cutter diameter
● Maximum infeed depth ≤ cutting height of milling cutter
Please note that the cutting height of the milling cutter cannot be checked.
The maximum radial infeed depends on the milling cutter.
Turning
Operating Manual, 05/2017, A5E40868721
Programming technology functions (cycles)
Vortex milling: Down-cut-up-cut
10.4 Milling
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