Siemens SINUMERIK 840D sl Operating Manual page 462

Programming technological functions (cycles)
10.4 Turning - milling/turning machine
Machining method
● Roughing
In roughing applications, paraxial cuts are machined to the finishing allowance that has
been programmed. If no finishing allowance has been programmed, the workpiece is
roughed down to the final contour.
During roughing, the cycle reduces the programmed infeed depth D if necessary so that it
is possible for cuts of an equal size to be made. For example, if the overall infeed depth is
10 and you have specified an infeed depth of 3, this would result in cuts of 3, 3, 3 and 1.
The cycle would reduce the infeed depth to 2.5 to create 4 equally sized cuts.
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.
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
Finishing is performed in the same direction as roughing. The cycle automatically selects
and deselects tool radius compensation during finishing.
Procedure
462
Machine manufacturer
Please also refer to the machine manufacturer's instructions.
Machine manufacturer
Please also refer to the machine manufacturer's instructions.
1. The part program or ShopMill program to be processed has been created
and you are in the editor.
2. Press the "Turning" softkey.
3. Press the "Stock removal" softkey.
The "Stock Removal" input window opens.
4. Select one of the three stock removal cycles via the softkeys:
Simple straight stock removal cycle.
The "Stock removal 1" input window opens.
- OR -
Straight stock removal cycle with radii or chamfers.
The "Stock removal 2" input window opens.
- OR -
Stock removal cycle with oblique lines, radii, or chamfers.
The "Stock Removal 3" input window opens.
Operating Manual, 05/2017, A5E40868956
Milling