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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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<blockquote data-quote="oexing" data-source="post: 177038" data-attributes="member: 1493"><p>Last night I checked my Argentinan two part cylinder studs with microscope, they were 60 degrees thread form definitely, 9/16 x20 , the tap I got for cleaning up engine threads was marked UN 9/16-20. So no, not 55 degrees here. </p><p> As to titanium cylinder studs, I did not have the courage to have that material for this, loads are tension and my gut feel is the ht type looks a bit brittle. So it was stainless for studs and M 10x1 resp. 10x1.5 for stud ends, stainless very tough, no brittleness but you have to have MoS2 paste or the like on threads, even more critical on titanium threads I guess ? </p><p> Funny with bicycle threads same cycle threads for a century still. But it is a weird business anyway, always was, with all sorts of threads you won´t find anywhere else. Seems they are even more "conservative" than in the rest of engineering. But for no rational good reason having imperial sizes. Allright, once the production line is set up it does not matter much, if metric or imperial. But in a small workshop for one-off jobs it is just a waste of time in the awkward imperial manufacturing system. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 177038, member: 1493"] Last night I checked my Argentinan two part cylinder studs with microscope, they were 60 degrees thread form definitely, 9/16 x20 , the tap I got for cleaning up engine threads was marked UN 9/16-20. So no, not 55 degrees here. As to titanium cylinder studs, I did not have the courage to have that material for this, loads are tension and my gut feel is the ht type looks a bit brittle. So it was stainless for studs and M 10x1 resp. 10x1.5 for stud ends, stainless very tough, no brittleness but you have to have MoS2 paste or the like on threads, even more critical on titanium threads I guess ? Funny with bicycle threads same cycle threads for a century still. But it is a weird business anyway, always was, with all sorts of threads you won´t find anywhere else. Seems they are even more "conservative" than in the rest of engineering. But for no rational good reason having imperial sizes. Allright, once the production line is set up it does not matter much, if metric or imperial. But in a small workshop for one-off jobs it is just a waste of time in the awkward imperial manufacturing system. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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