Hill's Space

Back Grinding Proceeding Nicely

 |  1 min  |  104 words
As far as I got before making my new tile tool. Around 45 minutes of grinding have frosted three curves
After around 2 hours of grinding, most of the surface is roughened, which means it has made good contact.
After 5 hours of grinding the backside, only a tiny strip to the right remains unfrosted.
5.7 hours in, the unfrosted area is now only 2mm wide!

Grinding the back has gone smoothly. At first I didn’t get good contact between tool and mirror; one orientation would slide freely but after turning the mirror 90 degrees any attempts to slide would lock up. Eventually the tool wore down and I got good contact.

In these pictures, my goal is to spread the frosted area (where the mirror has been sanded down to a sphere) everywhere. Any smooth areas are where the grit hasn’t made good contact (lower areas). You can really see that one axis was flatter than the others. Now the back is basically spherical, aside from one small region!

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