Thanks Tony, I sure hope I can find this thread when I get around to actually making a ball turner.
I am actually working on closing up the space in my shop to receive my Craftsman 12x36 lathe which has been sitting outside my shop in a crate for the last 8 months waiting for me to finish that section of my shop.

My todo list keeps getting bigger and I seem to keep getting slower, must be that dam AGE virus that is going around.

Still not fully grasping the geometry but I think when I am at my lathe it will sink in.

If it is this simple why does anyone build the more complicated ball turner?

Thanks for the video that really helps.

Ralph