Siemens SINUMERIK 840D SL Operating Manual page 345

Plunge cutting
Plunge cutting is the preferred method of machining slots for "unstable" machines and
workpiece geometries. This method generally only exerts forces along the tool axis, i.e.
perpendicular to the surface of the pocket/slot to be machined (with the XY plane in Z
direction). Therefore, the tool is subject to virtually no deformation. As a result of the axial
loading of the tool, there is hardly any danger of vibration occurring for unstable workpieces.
The cutting depth can be considerably increased. The plunge cutter, as it is known, ensures
a longer service life due to less vibration for long overhangs.
Approach/retraction for vortex milling
1. The tool approaches the starting point in front of the slot in rapid traverse and maintains
2. The tool goes to the cutting depth.
3. The open slot is always machined along its entire length using the selected machining
4. The tool retracts to the safety clearance in rapid traverse.
Approach/retraction for plunge cutting
1. The tool moves in rapid traverse to the starting point in front of the slot at the safety
2. The open slot is always machined along its entire length using the selected machining
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.
Milling
Operating Manual, 02/2012, 6FC5398-7CP40-3BA0
the safety clearance.
method.
clearance.
method.
Programming technological functions (cycles)
8.2 Milling
345