Polar Coordinates

lordsikander pakistan
Hello to all..
pardon me if i am asking a wrong question.
Could there be any chance we can use Polar Coordinates (r, theta, z) instead of X,Y,Z Coordinates to guide robot across a circular job..
For a circular job there is limitations of robot movement in a full circle, i want to rotate the job keep the radius constant and playing with Z-Axis only.