Siemens SINUMERIK 840D sl Turning Operating Manual page 542

Programming technology functions (cycles)
10.4 Milling
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.
Input simple
For simple machining operations, you have the option to reduce the wide variety of parameters
to the most important parameters using the "Input" selection field. In this "Input simple" mode,
the hidden parameters are allocated a fixed value that cannot be adjusted.
If the workpiece programming requires it, you can display and change all of the parameters
using "Input complete".
Approach/retraction for vortex milling
1. The tool approaches the starting point in front of the slot in rapid traverse and maintains the
safety clearance.
2. The tool goes to the cutting depth.
3. The open slot is always machined along its entire length using the selected machining
method.
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
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
542
Machine manufacturer
Various defined values can be pre-assigned using setting data.
Please refer to the machine manufacturer's specifications.
Operating Manual, 06/2019, A5E44903486B AB
Turning