Bertho,
Take a look at the ARC MOTION tutorial in the Members Docs and i think you will find answers to a lot of questions besides the one you are asking. Take a look at the Figure 9 . There are numerous examples of code and even shows the difference between using absolute, incremental, and radius.
You can get a finishing pass out of LazyCam in the mean time until Lazyturn is finished. Have a look at Tutorial #5,
Section 9 for how to do it. The LC and LT manuals are also in the Members Docs.
RICH