Isn't the Norton flattening stone SiC? Should eat up most anything.
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Isn't the Norton flattening stone SiC? Should eat up most anything.
It is. And that's why I mentioned using it with slurry. Using a DMT to get some bits of that SiC loose made it faster than it already was. But whatever they use as a binder seems like it isn't as hard as it could/should be for what it is. They wear fairly quickly, particularly when used for purposes other than Norton intended. I've got a feeling if used exclusively for synthetic water hones they would last much, much longer than when abused and put to the task of flattening a hard natural.
The flatness of your stone does not have to be within NASA tolerances. The pencil grid method has served us well. I think if you were to use a straight edge test, you would end up chasing your tail, and eating up too much of your stone.
I never really tried to use mine on anything other than the Norton synthetics. Once I got that rubber that came with my Chosera 1K, that's all that I used on the Nortons. It worked so well that I didn't need the flattener any more.