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Jeff Toycen

Our question is if a slow speed wheel in a water bath

Diamond or CBN  from Pat we hear the following

Knife grinders use CBN wheels. He has is own “brand” made for him to his speeches by a Chinese manufacturer.
Someone has done a CBN vs diamond wheel comparison and test. According to that test CBN wheels by far outlasted the diamond wheels. The diamond wheels at a certain point start to take extra passes to get the same result as when they’re new; and it gets worse from there. The CBN wheels stayed the same and showed little sign of wearing at that point in the test.