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Post by tkrueger3 on Aug 4, 2010 21:34:02 GMT -5
Another tool that I have never seen in person, so I have wonderments about them. With the rotating flat lap, do you manually hold the piece in place while it's grinding, and if not, how do you prevent the piece from just going round and round with the pan like a merry-go-round?
How long do you grind for each step? I know different stones take different times, but let's say you have a 4" thunderegg half, for instance. How long in 220 before going to 400 or 600 (just real general ballpark guess will do)? And what are the steps, generally?
I know these are newbie questions, but then, I'm a newbie when it comes to laps - I don't even have one, but I'm thinking about Rube Goldberg-ing one together in the near future.
Thanks,
Tom
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Post by Woodyrock on Aug 10, 2010 0:52:58 GMT -5
Tom: My twenty inch flat lap has a pivoting bar that has a hold down shaft with a point to hold pieces, and allow rotation as well. The point sets into a flat piece of steel that has a conical hole bored into it. This piece of steel is dopped to the rock. Depending on how smooth the saw cut is where you determine what grit you start with. Time is determined by periodiclly checking the lapped surface. Small material like a four inch egg, I usually just hold...........half eggs are easier to hold than to dop anyway. Slabs are easier to dop than to hold. Woody
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