Traversing Commands With Polar Coordinates, (G0, G1, G2, G3 Ap - Siemens SINUMERIK 840DE Programming Manual

You come directly back into the Cartesian system by using the Cartesian coordinate
identifiers (X, Y, Z...). The defined pole is moreover retained up to program end.
Note
All the commands relating to pole input must be programmed in a separate NC block
If no pole is specified, the origin of the current coordinate system applies.
Example of defining a pole with G110, G111, G112
The statement of the pole in Cartesian G110(X,Y), G111(X,Y) G112(X,Y) or polar
coordinates by stating G110, G111, G112 with polar angle AP= and polar radius RP=.
4.2.2 Traversing commands with polar coordinates, (G0, G1, G2, G3 AP=..., RP=...)
Function
The polar coordinate method is useful only if a workpiece or part of a workpiece has radius
and angle measurements. Polar coordinates can be used to program these dimensions
directly in accordance with the drawing.
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
4.2 Travel commands with polar coordinates, polar angle, polar radius
Programming Motion Commands
4-5