[astro_nutt]

Hi Markus. I had to redo a camera tracking mount I built to something a bit more sturdy. I came up with this after borrowing some ideas. It's a peg and slot drive set up which pushes a contact surface with a gradual curve. This then turns the axis pointing to the SCP










As you can see from the diagram, (I must stress this is an example only), the curved surface meets up with the ball bearing.
13.4mm of travel from the drive system will equal 13.4mm or 10 degrees of circumference. It's not perfect and I only have about 15 degrees on my set up. It's a trial and error in progress. hope this helps. Cheers!