Siemens SINUMERIK 828D Operating Manual page 280

Programming technological functions (cycles)
8.3 Contour milling
Polar starting point
Parameter Description
PL Machining plane
Cartesian:
X Starting point X (abs)
Y Starting point Y (abs)
Polar:
X Position pole (abs)
Y Position pole (abs)
Starting point
L1 Distance to pole, end point (abs)
ϕ1 Polar angle to the pole, end point (abs)
Additional The contour is finished in continuous-path mode (G64). As a result, contour transitions
commands such as corners, chamfers or radii may not be machined precisely.
If you wish to avoid this, there is a possibility to use additional commands when
programming.
Example: For a contour, first program the X parallel straight line and then enter "G9"
(non-modal exact stop) for the additional command parameter. Then program the Y-
parallel straight line. The corner will be machined exactly, as the feedrate at the end of
the X-parallel straight line is briefly zero.
Note:
The additional commands are only effective for path milling!
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3. Press the "Accept" softkey.
4. Enter the individual contour elements.
1. Press the "Pole" softkey.
2. Enter the pole position in Cartesian coordinates.
3. Enter the starting point for the contour in polar coordinates.
4. Enter any additional commands in G code format, as required.
5. Press the "Accept" softkey.
6. Enter the individual contour elements.
Operating Manual, 06/2009, 6FC5398-7CP20-0BA0
Unit
mm
mm
mm
Degrees
mm
Degrees
HMI sl Milling