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Posted by Robert May on November 7, 2002 19:54:28 UTC

The 303 grade should be quite fine enough for a finish grinding. I had to pull my copy of Texerau to find the grading of the 300 series. 301 is the coarsest grit and the 303 is finer.
You can stop grinding at almost any point (80 grit will be an exercise in frustration tho) and start polishing the glass.
BTW, where are you getting grit in the 300 series? Here in the US, grit is always sold in the mesh size for silicon carbide with the finer stuff of aluminum oxide in the micron sizing.
You also want to be aware that there is a thing called "pit chasing" where you keep grinding in one size to get rid of the pits of a certain size and the grinding process keeps making more pits of that size. To prevent this, you need to mark the location of several big pits and when they are gone, you are done with that grit size.

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