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Posted by Dick Hosmer on Monday, 25 July 2011, at 10:51 a.m., in response to Re: Tumbling, posted by Dick Hosmer on Sunday, 24 July 2011, at 12:39 a.m.
Just in case I was not clear about the three lands and three grooves of EQUAL width concept, take a piece of paper and a compass. Lightly draw two concentric circles. Use the compass to divide the circle last drawn into six equal arcs. At each arc mark, draw short radial lines from the outer circle to the inner circle. Darken these lines. Now darken ALTERNATE arcs. This will produce a cross-section of a TD barrel, or a slug therefrom. Note that it is quite possible to take a true diameter across opposing high points. This SHOULD be the groove diameter, or VERY close to it. No special tools, no hocus-pocus.
Of course, the above would NOT work in any case where the lands and grooves were not equal in width.
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