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Old 07-13-2007, 10:43 AM
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KurtB KurtB is offline
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Join Date: Mar 2007
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Default Re: Over Engineered - perhaps

Danny, I was going to bore the blocks as a unit; then, when separated, face mill about .002" off each block where they meet, leaving a narrow band of material at the bottom. That would force any piching action to act on the coin alone, plus the band.

Another option is to use a 1/8" ball mill to run a groove at the bottom of one block, a corresponding groove slightly shallower in the other block, and use a 1/8" dowel pin layed in the groove as a hinge point. That would act as both an alignment feature, and a hinge.

It could be made one piece, but I don't like being forced to use a fine slitting saw to hack through 3" of material, leaving it intact at the bottom, like the one in Steve's picture.

Apparently the serious cutters use a lot more force than I'd ever have imagined, so I really want to make it clamp hard, yet not mar the coin.
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