Got an idea for a method to test speed objectively to get some useful comparative info (not critical, but interesting) and fabbed this up tonight. The wood arms hold a hardened ball bearing and a weight (~5 oz.) presses down on the ball bearing with uniform pressure. I set a stop in front of the two front legs and behind the back leg to get a uniform stroke length. Making a set number of laps (same for every stone) will produce a flat on the bearing.
The faster the stone, the larger the flat will be produced on the ball with the same number of laps. I'll measure the diameter of the flat produced with my scope software. One nice thing is I can get quite a few tests out of each hardened ball by just rotating it slightly for each new test.
I've got a pretty good selection of stones but if anybody else is curious about theirs and wants to send a stone I'd be happy to test it. I'll be testing some common synths also for a baseline/standard of comparison.
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Hone Speed Tester Project
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