Open Groove (Cycle899) - Siemens sinumerik 840D sl Operating Manual

8.4.9

Open groove (CYCLE899)

Function.
Use the "Open slot" function if you want to machine open slots.
For roughing, you can choose between the following machining strategies, depending on
your workpiece and machine properties.
● Vortex milling
● Plunge cutting
The following machining types are available to completely machine the slot:
● Roughing
● Rough-finishing
● Finishing
● Base finishing
● Edge finishing
● Chamfering
Vortex milling
Particularly where hardened materials are concerned, this process is used for roughing and
contour machining using coated VHM milling cutters.
Vortex milling is the preferred technique for HSC roughing, as it ensures that the tool is
never completely inserted. This means that the set overlap is precisely maintained.
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.
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
the safety clearance.
method.
Programming technology functions (cycles)
8.4 Milling
361