Inspecting & Lapping a Granite Surface Plate

My friend Lance brought along his electronic differential leveling system so he could do some inspection on a few granite surface plates at our buddy John's shop during the week of the scraping class. The granite plate in this video is a 36"x36" that John bought at an auction. It was not bad but still needed some attention. I'll have some more of this working on my own granite place coming up pretty soon.

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