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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Stud Thread Profile
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<blockquote data-quote="chankly bore" data-source="post: 67456" data-attributes="member: 317"><p>I have "Engineering Workshop Data" published by Caxton (U.K.) in 1947. It is obviously coeval with the era of H.R.D./Vincent production.It refers to C.E.I.threads the standards of which were published in 1901 and re-issued as B.S.C. threads in B.S. 811 of 1938. It lists 9/16" x20 t.p.i. both right and left as an "exceptional thread" for bicycle pedal cranks. See M.P.H. 661 for an interesting article on the subject by Mike White. Laurie Binns ( bless his memory) used the special tap mentioned on a long registering shank together with 9/16 x16 U.N.F. inserts or 14mm. spark plug ditto. The bicycle world is quite literate about this thread. P'raps we can talk the excellent and erudite Magnetoman into some microphotography to lay this issue to a long-deserved rest.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 67456, member: 317"] I have "Engineering Workshop Data" published by Caxton (U.K.) in 1947. It is obviously coeval with the era of H.R.D./Vincent production.It refers to C.E.I.threads the standards of which were published in 1901 and re-issued as B.S.C. threads in B.S. 811 of 1938. It lists 9/16" x20 t.p.i. both right and left as an "exceptional thread" for bicycle pedal cranks. See M.P.H. 661 for an interesting article on the subject by Mike White. Laurie Binns ( bless his memory) used the special tap mentioned on a long registering shank together with 9/16 x16 U.N.F. inserts or 14mm. spark plug ditto. The bicycle world is quite literate about this thread. P'raps we can talk the excellent and erudite Magnetoman into some microphotography to lay this issue to a long-deserved rest. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Stud Thread Profile
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