Circular Pocket (Pocket4) - Siemens sinumerik 840D sl Operating Manual

Programming technology functions (cycles)
8.4 Milling
8.4.3

Circular pocket (POCKET4)

Function
You can use the "Circular pocket" cycle to mill circular pockets on the face or peripheral
surface.
The following machining variants are available:
● Mill circular pocket from solid material.
● Pre-drill circular pocket in the center first if, for example, the milling cutter does not cut in
For milling with the "Circular pocket" function two methods are available: the plane-by-plane
method and the helical method.
Approach/retraction during plane-by-plane machining
In plane-by-plane machining of the circular pocket, the material is removed horizontally, one
layer at a time.
1. The tool approaches the center point of the pocket at rapid traverse at the height of the
2. The tool is inserted into the material according to the method selected.
3. The circular pocket is always machined from inside out using the selected machining
4. The tool moves back to the safety distance at rapid traverse.
Approach/retraction during helical machining
In helical machining, the material is removed down to pocket depth in a helical movement.
1. The tool approaches the center point of the pocket at rapid traverse at the height of the
2. Infeed to the first machining diameter.
3. The circular pocket is machined to pocket depth using the selected machining method.
4. The tool moves back to the safety distance at rapid traverse.
340
the center (program the drilling, circular pocket and position program blocks in
succession).
retraction plane and adjusts to the safety distance.
method.
retraction plane and adjusts to the safety distance.
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Turning