Siemens SINUMERIK 840D, Operating Manual

Page: 309 / 610

Programming technological functions (cycles)
8.2 Milling
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
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Annular groove
To create an annular groove, you must enter the following values for the "Number N" and
"Aperture angle α1" parameters:
N = 1
α1 = 360°
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 slot as follows:
●
Roughing
During roughing, the individual planes of the slot are machined one after the other from
center point of the semicircle at the end of the slot until depth Z1 is reached.
● Finishing
In "Finishing" mode, the edge is always machined first until depth Z1 is reached. The slot
edge is approached on the quadrant, which joins the radius. In the last infeed, the base is
finished from the center point of the semicircle to the end of the slot.
● Finishing of edge
Edge finishing is performed in the same way as finishing, except that the last infeed
(finish base) is omitted.
● Chamfer
Chamfering involves edge breaking at the upper edge of the circumferential groove.