Siemens SINUMERIK 840D sl Operating Manual page 405

If the workpiece programming requires it, you can display and change all of the parameters
using "Input complete".
Approach/retraction
1. The tool approaches the center point of the semicircle at the end of the slot at rapid traverse
at the height of the retraction plane and adjusts to the safety clearance.
2. Then, the tool enters the workpiece at machining infeed (taking into consideration the
maximum infeed in the Z direction and the finishing allowance). The circumferential slot is
machined in the programmed machining direction (up-cut or down-cut) in a clockwise or
counterclockwise direction.
3. When the first circumferential slot is finished, the tool moves to the retraction plane at rapid
traverse.
4. The next circumferential slot is approached along a straight line or circular path and then
machined.
5. The tool moves back to the safety clearance at rapid traverse.
Machining type
You can select the machining mode for milling the circumferential groove as follows:
● Roughing
During roughing, the individual planes of the groove are machined one after the other from
the center point of the semicircle at the end of the groove until depth Z1 is reached.
● Finishing
In "Finishing" mode, the edge is always machined first until depth Z1 is reached. The groove
edge is approached on the quadrant that joins the radius. In the last infeed, the base is
finished from the center point of the semicircle to the end of the groove.
Milling
Operating Manual, 05/2017, A5E40868956
Programming technological functions (cycles)
10.2 Milling
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