Siemens SINUMERIK 840D, Operating Manual, Page: 433 / 610

Programming technological functions (cycles)
8.7 Further cycles and functions ShopMill
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
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8.7.13 Circle polar
A circle in the polar coordinate system is defined by an angle (α). The angle refers to the X
axis.
The tool moves from its actual position on a circular path to the programmed end point
(angle) at the machining feedrate. The radius corresponds to the distance from the actual
tool position to the defined pole, i.e. the circle starting and end point positions are at the
same distance from the defined pole.
The 1st arc in polar coordinates entered after the pole must be programmed with an absolute
angle. You can program any additional straight lines or circles with incremental coordinates.
Procedure
1. The ShopMill program to be edited has been created and you are in
the editor.
2. Press the menu forward key and the "Straight Circle" softkey.
3. Press the "Polar" and "Circle polar" softkeys.
Parameter Description Unit
The tool travels in the programmed direction from the circle starting point to its end
point. You can program this direction as clockwise (right) or counterclockwise
(left).
Clockwise direction of rotation
Direction of rotation
Counterclockwise direction of rotation
Polar angle to the pole, end point (abs) or
change in polar angle to the pole, end point (inc)
Degrees
F Machining feedrate mm/rev
mm/min
mm/tooth