Siemens SINUMERIK 840DE Programming Manual page 114

Programming Motion Commands
4.2 Travel commands with polar coordinates, polar angle, polar radius
Example of cylinder coordinates
The 3rd geometry axis, which lies perpendicular to the working plane, can also be specified
in Cartesian coordinates.
This enables spatial parameters to be programmed in cylindrical coordinates.
Example: G17 G0 AP... RP... Z...
Traversing commands
The positions stated with polar coordinates can be approached with rapid traverse G0, linear
interpolation G1, circular interpolation clockwise G2 or counterclockwise G3.
Working plane
The polar coordinates are valid in the working plane selected with G17 to G19.
You must not program Cartesian coordinates, such as interpolation parameters or axis
addresses, for the selected working plane in NC blocks with polar end position coordinates.
Polar angle AP
When absolute dimensions are specified, the angular reference is based on the horizontal
axis of the working plane, e.g., X axis with G17. The positive direction of rotation is counter-
clockwise.
The polar angle can be defined both absolutely and incrementally.
When incremental coordinates are entered (AP=IC...), the last angle programmed is taken
as the reference. The polar angle is stored until a new pole is defined or the working plane is
changed.
If no pole is defined, then the origin of the current workpiece coordinate system is considered
as pole.
4-8
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals