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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton forks
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<blockquote data-quote="oexing" data-source="post: 146851" data-attributes="member: 1493"><p>My idea for the Brampton - and the rear suspension - was to get something I can adjust in all ways to my liking. So no readymade shock would do as you always want it a bit different to what you can order. So I came upon the the Fournales oleopneumatic like they designed in aviation. The Fournales is an all threaded design with standard hydraulic seals , oil filling and air pressurized. No bump stops required , the air content does same function, and progressive action is set by the volume of oil and air inside. The damping valve is a very simple design you could fabricate , like the rest, on the lathe. The o.d. of the shock is less than 50mm and extremely lightweight, 800gr . So maybe Fournales would be willing to do specials for Vincent. I will have the upper shroud black, so looks will be close to standard and suitable at the rear as well, no extra damper for damping is needed. </p><p> Anyway, when fabricating upper and lower joints for a damper I strongly advice to have some give in the eyes as you do not want <strong>any</strong> sideloads on piston rods from questionable brackets on the fork or frame . Mostly rubber bushes are pressed in damper ends for this purpose, I got me IGUS spherical slim bushes for my dampers as space around frame is limited. So this would be my approach to have specials made for Bramptons and rear suspension too, like Fournales do with spheric bushes , no rubber . By not taking care for some misalignment in brackets you may be very sorry later as we have seen broken piston rod threads - and not by overload in pure tension load but from cracking by sideload !! So when looking into photos above I don´t like forked joint ends plus bolt as no compensation for misalignment , better have spherical bushes with corresponding bracketry. Sorry, no pattern for the lower Brampton bracket to show, as I am still busy with other items. </p><p></p><p> Vic</p><p></p><p>[ATTACH=full]45417[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]45418[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]45419[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]45420[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 146851, member: 1493"] My idea for the Brampton - and the rear suspension - was to get something I can adjust in all ways to my liking. So no readymade shock would do as you always want it a bit different to what you can order. So I came upon the the Fournales oleopneumatic like they designed in aviation. The Fournales is an all threaded design with standard hydraulic seals , oil filling and air pressurized. No bump stops required , the air content does same function, and progressive action is set by the volume of oil and air inside. The damping valve is a very simple design you could fabricate , like the rest, on the lathe. The o.d. of the shock is less than 50mm and extremely lightweight, 800gr . So maybe Fournales would be willing to do specials for Vincent. I will have the upper shroud black, so looks will be close to standard and suitable at the rear as well, no extra damper for damping is needed. Anyway, when fabricating upper and lower joints for a damper I strongly advice to have some give in the eyes as you do not want [B]any[/B] sideloads on piston rods from questionable brackets on the fork or frame . Mostly rubber bushes are pressed in damper ends for this purpose, I got me IGUS spherical slim bushes for my dampers as space around frame is limited. So this would be my approach to have specials made for Bramptons and rear suspension too, like Fournales do with spheric bushes , no rubber . By not taking care for some misalignment in brackets you may be very sorry later as we have seen broken piston rod threads - and not by overload in pure tension load but from cracking by sideload !! So when looking into photos above I don´t like forked joint ends plus bolt as no compensation for misalignment , better have spherical bushes with corresponding bracketry. Sorry, no pattern for the lower Brampton bracket to show, as I am still busy with other items. Vic [ATTACH type="full"]45417[/ATTACH] [ATTACH type="full"]45418[/ATTACH] [ATTACH type="full"]45419[/ATTACH] [ATTACH type="full"]45420[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton forks
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