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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: 177146" data-attributes="member: 1493"><p>Do we agree the Vincent works had a thread rolling head for the cylinder studs then ? So they had rollers with 20 tpi for the head and that pitch was found in BSC British cycle thread as well, with 60 degrees profile certainly. With a rolling head you can do a few sizes of threads with same rollers, depending on the brand of heads, I only know the Fette types.</p><p> So then it looks quite logic to find the 60 degrees type on Vincent studs and the best solution when dealing with thin walled studs they got on early B bikes. The Spares Co. will have that type of thread studs on their stock I guess . So when repairs are made on stripped engine threads you want to do adapters for the 60 deg BSC 9/16-20 studs. And taps are cheap to get from Aliexpress like in link below, once again, dies as well. But I would not suggest dies , the threads would not come out very clean, better have a lathe tool for the studs. Or even better get studs form the Spares Co as they may have rolled threads ??</p><p> The thread profile in my micro photos looks a bit rounded in the i.d. but is correct like this. You do not want a sharp core diameter when there is high tension on the bolt. The radius got clearance in the tapped adapter from predrilling correct oversize. So then the bolt/stud sits nicely in the tapped thread even when that looks a bit strange to Joe Public.</p><p> In photos some studs I did with my own rolling heads for showing correct profiles. You can modify diameters as you like them for your nuts but take care for dirt so some slack should be present .</p><p></p><p> Vic</p><p></p><p>Cycle thread 60 deg. UN 9/16-20:</p><p><a href="https://www.aliexpress.com/w/wholesale-9%252F16%2525252d20.html?spm=a2g0o.cart.search.0" target="_blank">UN 9/16-20</a></p><p></p><p>[ATTACH=full]61242[/ATTACH]</p><p></p><p>[ATTACH=full]61243[/ATTACH]</p><p></p><p>[ATTACH=full]61244[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 177146, member: 1493"] Do we agree the Vincent works had a thread rolling head for the cylinder studs then ? So they had rollers with 20 tpi for the head and that pitch was found in BSC British cycle thread as well, with 60 degrees profile certainly. With a rolling head you can do a few sizes of threads with same rollers, depending on the brand of heads, I only know the Fette types. So then it looks quite logic to find the 60 degrees type on Vincent studs and the best solution when dealing with thin walled studs they got on early B bikes. The Spares Co. will have that type of thread studs on their stock I guess . So when repairs are made on stripped engine threads you want to do adapters for the 60 deg BSC 9/16-20 studs. And taps are cheap to get from Aliexpress like in link below, once again, dies as well. But I would not suggest dies , the threads would not come out very clean, better have a lathe tool for the studs. Or even better get studs form the Spares Co as they may have rolled threads ?? The thread profile in my micro photos looks a bit rounded in the i.d. but is correct like this. You do not want a sharp core diameter when there is high tension on the bolt. The radius got clearance in the tapped adapter from predrilling correct oversize. So then the bolt/stud sits nicely in the tapped thread even when that looks a bit strange to Joe Public. In photos some studs I did with my own rolling heads for showing correct profiles. You can modify diameters as you like them for your nuts but take care for dirt so some slack should be present . Vic Cycle thread 60 deg. UN 9/16-20: [URL='https://www.aliexpress.com/w/wholesale-9%252F16%2525252d20.html?spm=a2g0o.cart.search.0']UN 9/16-20[/URL] [ATTACH type="full" alt="P1050887.JPG"]61242[/ATTACH] [ATTACH type="full" alt="P1050881.JPG"]61243[/ATTACH] [ATTACH type="full" alt="P1080925.JPG"]61244[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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