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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="Tom Gaynor" data-source="post: 28388" data-attributes="member: 4034"><p>Much depends on how the threads were formed. If they were rolled, then 6 mm might be just about the right size to produce a 1/4" thread. Back when God was a boy we used "forming taps" which had no cutting edges, but squeezed the "troughs" of the threads to form the crests, essentially cold forging them. The "tapping size" for these was about 10 thou bigger than for a cut thread.</p><p>(If they were cut male threads it is less defensible - although I speak as someone GIVEN 20 feet of 6 mm stainless thickwall tubing, from which I made dozens of brake rods. Dammit, I would have had to BUY 1/4" rod! Threads can be truncated without loss of strength, so the 10 thou difference between 6 mm and 1/4" 1) wasn't apparent to the naked eye anyway and 2) made no structural difference.)</p><p>I post this, bravely, conscious that it may incur the disapproval of Peter Stokes. I can live with it.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 28388, member: 4034"] Much depends on how the threads were formed. If they were rolled, then 6 mm might be just about the right size to produce a 1/4" thread. Back when God was a boy we used "forming taps" which had no cutting edges, but squeezed the "troughs" of the threads to form the crests, essentially cold forging them. The "tapping size" for these was about 10 thou bigger than for a cut thread. (If they were cut male threads it is less defensible - although I speak as someone GIVEN 20 feet of 6 mm stainless thickwall tubing, from which I made dozens of brake rods. Dammit, I would have had to BUY 1/4" rod! Threads can be truncated without loss of strength, so the 10 thou difference between 6 mm and 1/4" 1) wasn't apparent to the naked eye anyway and 2) made no structural difference.) I post this, bravely, conscious that it may incur the disapproval of Peter Stokes. I can live with it. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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