Contour Turning; General Information - Siemens sinumerik 840D sl Operating Manual

8.3

Contour turning

8.3.1

General information

Function
You can machine simple or complex contours with the "Contour turning" cycle. A contour
comprises separate contour elements, whereby at least two and up to 250 elements result in
a defined contour.
You can program chamfers, radii, undercuts or tangential transitions between the contour
elements.
The integrated contour calculator calculates the intersection points of the individual contour
elements taking into account the geometrical relationships, which allows you to enter
incompletely dimensioned elements.
When you machine the contour, you can make allowance for a blank contour which must be
entered before the finished-part contour. You then choose one of the following machining
technologies:
● Stock removal
● Grooving
● Plunge-turning
You can rough, remove residual material and finish for each of the three technologies above.
Programming
For example, the programming procedure for stock removal is as follows:
Note
When programming in G code, it must be ensured that the contours are located after the end
of program identifier!
1. Enter the unmachined-part contour
2. Enter finished-part contour
3. Contour call - only for G code program
4. Stock removal along the contour (roughing)
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
If, when removing stock along the contour, you want to take into account an unmachined
part contour (and no cylinder or no allowance) as unmachined part shape, then you must
define the contour of the unmachined part before you define the finished-part contour.
Compile the unmachined-part contour step-by-step from various contour elements.
You build up the finished-part contour gradually from a series of different contour
elements.
The contour is machined longitudinally, transversely or parallel to the contour.
Programming technology functions (cycles)
8.3 Contour turning
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