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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank mounting misalignment
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<blockquote data-quote="Oldhaven" data-source="post: 54519" data-attributes="member: 2879"><p>Quoting J Bickerstaff MPH 642:</p><p></p><p>"The more common ‘B’ item, however, was a malleable iron casting, forked to bolt either side of</p><p>the front head-bracket. This I suspect turned out to be a bit weak - perhaps in crashes. It is nice and light, but I have seen examples that have cracked or distorted.</p><p>So the factory produced the next type, a strong, I-beam, forging- but markedly heavier. (Just one of many ways the bikes</p><p>picked up weight over the years). This had a simpler lug for the head-bracket, which became slotted to accept it. This may</p><p>have been to make the forging operation easier, but it does narrow the attachment point quite significantly and so the fit and</p><p>tightness of your studs and sleeves at this point is quite important for maintaining rigidity" </p><p></p><p>To further her remarks, mine is the early rounded type and the tail part that connects the head mount fork to the steering column is a hollow tube shape. You can see right into the steering column from the fork end. This picture from earlier simpler times for me shows this. The structure makes me wonder if it might be easier to make a custom headstock this way, similar to the Egli UFM, rather than making an I beam shape. the whole thing could be made up in separate bits of large tubing for the main steering column and structural parts with rods through holes or milled slots in the large tubes for oil and petrol tank bosses and the"outie" head bracket fork sliding over the down tube. The whole lot welded together in a jig, then finally machined. See post 7 for another good picture to illustrate.</p><p></p><p>I wonder if Terry Prince made a billet UFM for standard Vincent suspension and petrol tank to cover situations like this if it would sell? </p><p></p><p>Ron</p><p></p><p></p><p></p><p></p><p></p><p></p><p>. .[ATTACH=full]2841[/ATTACH]</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 54519, member: 2879"] Quoting J Bickerstaff MPH 642: "The more common ‘B’ item, however, was a malleable iron casting, forked to bolt either side of the front head-bracket. This I suspect turned out to be a bit weak - perhaps in crashes. It is nice and light, but I have seen examples that have cracked or distorted. So the factory produced the next type, a strong, I-beam, forging- but markedly heavier. (Just one of many ways the bikes picked up weight over the years). This had a simpler lug for the head-bracket, which became slotted to accept it. This may have been to make the forging operation easier, but it does narrow the attachment point quite significantly and so the fit and tightness of your studs and sleeves at this point is quite important for maintaining rigidity" To further her remarks, mine is the early rounded type and the tail part that connects the head mount fork to the steering column is a hollow tube shape. You can see right into the steering column from the fork end. This picture from earlier simpler times for me shows this. The structure makes me wonder if it might be easier to make a custom headstock this way, similar to the Egli UFM, rather than making an I beam shape. the whole thing could be made up in separate bits of large tubing for the main steering column and structural parts with rods through holes or milled slots in the large tubes for oil and petrol tank bosses and the"outie" head bracket fork sliding over the down tube. The whole lot welded together in a jig, then finally machined. See post 7 for another good picture to illustrate. I wonder if Terry Prince made a billet UFM for standard Vincent suspension and petrol tank to cover situations like this if it would sell? Ron . .[ATTACH=full]2841[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank mounting misalignment
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