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what also matters here is the kind of glass you are grinding. Different glasses have different hardnesses and some can really clog up a wheel while others really wear it down. The issue of how the wheel is made, resin or sintered really does matter. How much water you flood the wheel with and how much pressure you apply also matter. I sill get my best surfaces from silicon carbide grit but I do use a 60 Grit wheel I got from david to remove a bunch of stock.
My best surfaces alway came from a true newcastle stone but that cliff was played out by 1970. It was a lot like marriage to work with it.
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Where are we going and why am I in this basket?
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