Polar Coordinates - Siemens SINUMERIK 840D sl Operating Manual

7.4.4

Polar coordinates

You can specify positions using right-angled coordinates or polar coordinates.
If a point in a workpiece drawing is defined by a value for each coordinate axis, you can
easily input the position into the parameter screen form using right-angled coordinates. For
workpieces that are dimensioned with arcs or angular data, it is often easier if you input the
positions using polar coordinates.
You can only program polar coordinates for the functions "Straight circle" and "Contour
milling."
The point from which dimensioning starts in polar coordinates is called the "pole".
Figure 7-9
The position specifications for the pole and points P1 to P3 in polar coordinates are:
Pole: X30 Z30 (relative to the zero point)
P1: L30 α30° (relative to the pole)
P2: L30 α60° (relative to the pole)
P3: L30 α90° (relative to the pole)
Turning
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Polar coordinates
Creating a ShopTurn program
7.4 Fundamentals
233