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Cutting Imperial threads on a metric Boxford BUD

Cutting Imperial threads using change wheels and a 3mm leadscrew.

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Brit-car -fan22/10/2012 15:18:26
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Could anyone help me out here as the figures don't seem to make sense. From what I have been able to glean from various internet sources I require a 135/127 tooth combination gear - but how does it work out? 135 devided by 127 = 1.063, yet 0.125" (1/8" devided by 0.1181" (3mm) = 1.0584. Is this just the nearest they could get to the true figure, or am I missing something?

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