Originally Posted by
Leighton
I read that post as I was furiously lapping away at mine with a D8XX, btw, it still takes forever.
First, he is lapping a fine, so not the untra hard UF. Second, different stones have different straightnesses from the factory. All are guaranteed to be within .002", but thats a lot variation when it takes forever to lap these suckers. Third, if you read carefully, he only laps about 3/4 of the stone, he leaves the ends a little submerged than the middle. Finally, I think he only lapped one side. Thus...I think his method does not calculate the true costs in lapping those tough sons of :cen.
HOWEVER, once they are lapped, they work wonderfully. In fact, I would say that once lapped, the value increases to maybe 2x the retail. Except the 4k grit one, that one took maybe an hour, probably less. That one was really easy. In comparison.