Thanks for the information, I will read it.
You are right I never made a mirror before.
My idea was, after making the surface, to cast a tool same size of the marble, fix this tool on a vertical metal bar centered on the marble center line, spin the marble on a motorized lazy Susan and let the tool work by gravity on the marble.
The idea is not to let the tool moving across (that's why the same diameter and working on the same center) trying preserving the initial surface.
Anyway, i will try to gain more knoledge and I will eventually post if I can achieve something.
Thank you very much for the moment.
V.
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