5
ShopTurn Functions 08/2005
5.3 Turnin
5
♥ Siemens AG, 2005. All rights reserved.
5-208 SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
5.3.7 Parting
The "Parting" function is used when you want to cut off dynamically
balanced parts (e.g. screws, bolts or barrels).
You can program a chamfer or rounding on the edge of the machined
part.
You can machine at a constant cutting rate V or speed of rotation S up
to a depth X1, from which point the workpiece is machined at a
constant speed. From the depth X1, you can also program a reduced
feedrate FR or a reduced speed of rotation SR in order to adapt the
velocity to the smaller diameter.
Use parameter X2 to enter the final depth that you wish to reach with
parting. With barrels, for example, you do not need to part right to the
center; it is sufficient to part to slightly more than the wall thickness of
the barrel.
Approach/retraction
1. The tool is moved at rapid traverse first to the return plane and
then to the safety clearance.
2. The chamfer or radius, if applicable, is made at machining
feedrate.
3. Parting down to depth X1 is performed at machining feedrate.
4. Parting is continued down to depth X2 at reduced feedrate FR and
reduced speed SR.
5. The tool moves back to the safety clearance at rapid traverse.
If your turning machine is appropriately set up, you can extend a
drawer to accept the cut-off workpiece. Extension of the workpiece
drawer must be enabled in a machine data code.
Please also refer to the machine manufacturer's instructions.
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