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Posted by Robert May on November 27, 2001 20:39:56 UTC

Sounds like a pretty normal pad finish except for the turned edge. I'd put the tool on top and try to get the turned edge out if possible. Of course, it all depends upon the slope of the TDE as it could be a zone out at the edge. Pads normally give a rough surface as to the zones and the way to reduce them is to change the length of the stroke so that the pads don't keep rubbing the same areas.
After you get the glass fully polished, it's time to make the pitch lap and at that point, the true surface of the mirror will start showing up. Pads normally produce zoney surfaces and this is just fine for the purpose that they were originally designed for - fast polishing of eyeglass lenses which can be several waves of error on the surface and still perform excellently.

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