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excellent point Jimmy, a true straight edge is a good thing to have. Do you know the spec on that Starrett?

my memory is terrible. I thought this thread referred to stone flatness off the gdlp. Maybe there is another. Though it must be the flatness of the float glass substrate mentioned that stuck in my...

Atoma? mine is on a solid AL sub-base with a thin diamond plate attached to it-the plate with diamonds attaced is steel though looks plated.
I don't have a compact, only heard from those who've used...

remember hms is not the manufacturer. the compact lapping plate will not remain flat at all. The amount of pressure is less important than how and where the pressure is applied imho. However your...

lapping the lapper is a subject we don't speak of in polite society. Every lapping plate will fall out of tolerance as it is used, I think. I'll tryto talk my machinist wife into checking my dmt.
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