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Abrasive Problem

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Posted by Robert May on November 13, 2002 20:06:17 UTC

Just skip that grit size.
Professional grinders on machines usually use only 3 grit sizes - 120, 320 and 12 micron or something related for their making of a mirror.
Going by each and every grit size is more a pabulam attack to the amateur so that he will feel that he's doing something important.
I usually do the 80 grit for hogging and fitting of the tile tool, 220, 25micron and 12 micron finish when grinding. All in all, it takes just a little while longer at each grit to get the bigger pits out and that actually ends up with a much shorter time to grind total on the glass.
If you want to, take a scrap piece of glass and grind one half with one grit and the other half with the other grit and see which makes the larger pits. If the grit sizes are wrongly marked, don't be afraid to relabel them as the important thing here is to grind finer with each grit.

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