First I apologize if this topic is not for this forum, but I really don’t know where to start so at least I hope you can point me to the right place.
I recently got my first cnc and use it with ArtCam and Mach3. I did some simple engraving and cutting pieces in flat materials and everything went smoothly. Now, I decided to try engraving on the rings.

Where can I find a tutorial how to do simple engraving on rings, so I can solve the following problems:

- Every engraving I make in ArtCam in Mach3 is mirrored (turned horizontally)
- How can I most easily determine zero correctly on the x, y(a) and z axes?

Regards,
Midhat