Siemens SINUMERIK 840D Operating Manual page 296

Programming technological functions (cycles)
8.2 Milling
Machining type: Plane-by-plane
When milling circular pockets, you can select the following machining types:
● Roughing
● Finishing
● Finishing of edge
Machining type: Helical
When milling circular pockets, you can select the following machining types:
● Roughing
● Finishing
● Finishing of edge
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During roughing, the individual planes of the circular pocket are machined one after the
other from center point until depth Z1 is reached.
During finishing, the edge is always machined first. The pocket edge is approached on
the quadrant, which joins the pocket radius. In the last infeed, the base is finished from
the center out.
Edge finishing is performed in the same way as finishing, except that the last infeed
(finish base) is omitted.
During roughing, the circular pocket is machined downward with helical movements.
A full circle is effected down to pocket depth to remove the residual material.
The tool is retracted from the edge and base of the pocket in a quadrant and retracted
with rapid traverse to a safety clearance.
This process is repeated layer-by-layer, from inside out, until the circular pocket has been
completely machined.
In finishing mode, the edge is machined first with a helical movement down to the bottom.
A full circle is effected down to pocket depth to remove the residual material.
The base is milled from outside in a spiral movement.
The tool is retracted from the center of the pocket to a safety clearance.
In edge finishing, the edge is machined first with a helical movement down to the bottom.
A full circle is effected down to pocket depth to remove the residual material.
The tool is retracted from the edge and base of the pocket in a quadrant and retracted
with rapid traverse to a safety clearance.
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling