Siemens SINUMERIK 840D sl Operating Manual page 324

Programming technology functions (cycles)
8.2 Rotate
If the tool does not round the corner at the end of the cut, it is raised by the safety distance
or a value specified in the machine data at rapid traverse. The cycle always observes the
lower value; otherwise, stock removal at inner contours, for example, could cause the
contour to be damaged.
● Finishing
Approach/retraction
1. The tool first moves at rapid traverse to the starting point of the machining operation
2. The tool moves to the first infeed depth at rapid traverse.
3. The first cut is made at machining feedrate.
4. The tool rounds the contour at machining feedrate or is raised at rapid traverse (see
5. The tool is moved at rapid traverse to the starting point for the next infeed depth.
6. The next cut is made at machining feedrate.
7. Steps 4 to 6 are repeated until the final depth is reached.
8. The tool moves back to the safety distance at rapid traverse.
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The angle between the contour and the tool cutting edge determines whether the tool
rounds the contour at the end of each cut by the infeed depth D, in order to remove
residual corners, or is raised immediately. The angle beyond which rounding is performed
is stored in a machine data element.
Machine manufacturer
Please also refer to the machine manufacturer's instructions.
Machine manufacturer
Please also refer to the machine manufacturer's instructions.
Finishing is performed in the same direction as roughing. The cycle automatically selects
and deselects tool radius compensation during finishing.
calculated internally in the cycle (reference point + safety distance).
"Roughing").
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Turning