> Concentrate on the basic grinding action as
> described by the experts and you really can't go wrong during the grinding
> phase.
I thought I used the basic grinding action on my first (and continuing) attempt at making a mirror. (Perhaps I am "keck-handed," as someone wrote in ATM 1). I tried the pencil test, with results that didn't look bad to me. I started polishing, and it was very pleasing to see the center polish nicely, and the polished region then spread to the edge. Well, almost. There was a ring about 1/2" in from the edge which refused to polish. Apparently, I had depressed this during grinding, and the pencil test didn't reveal it, at least to me. I went back to fine grinding (a few grades), and tried a slower stroke. As far as I can tell, it's better, but it takes much longer to grind out the previous grade's pits. Did speed really matter? (It is a small mirror, 4.25", if that matters.)
Clay Spence cspence@sarnoff.com