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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton forks
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<blockquote data-quote="timetraveller" data-source="post: 146814" data-attributes="member: 456"><p>Since posting the above I have had time to think about this but need to run some ideas past those who have an interest in this. First, some background. When I took orders for the latest batch of 20 JE steering stems several people wanted to use the modified lower links but did not want to use their existing link. Four people ordered links from the Spares Company and had them sent to me while others looked around for second hand links. It turned out that the SC was out of stock of these links and that had been the case for some time. I can't remember exactly how long the delay was but about two months. When they did finally turn up two were so badly machined that they had to go back and be exchanged. I have now had to work on quite a lot of new lower links and if you have never seen one you will get quite a shock. They are supplied as cast with surface rust. The only machining that has been done is on the places where is has to be done and there has been no attempt to smooth, or even polish, the other surfaces let alone paint them. I have also worked on some of the original seventy years old ones and on those all the surfaces have been smoothed, possibly polished. Because of the supply problem I offered to do some design work and get a price for getting some new ones made by CNC machining. There was no interest.</p><p></p><p>With that as a background I was wondering if this might be a path that would work for the modified Bramptons. The idea is that in consultation with those who have Bramptons and who might already have them modified it should be possible to design new lower links with the fitting for a lower attachment point for a coil over damper unit. This way no old links would be modified and the design could be optimised to allow the fitting of some as yet unspecified suspension unit. The problems I foresee are how many would be required and is it possible to find a consensus as to the design parameters? I assume that the originals would have been forgings but things have moved on enough that we now have girdraulic fork blades machined from extrusions so it is possible that there are now steel specifications whose use would allow the same to be done with the lower links.</p><p>Thoughts please.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 146814, member: 456"] Since posting the above I have had time to think about this but need to run some ideas past those who have an interest in this. First, some background. When I took orders for the latest batch of 20 JE steering stems several people wanted to use the modified lower links but did not want to use their existing link. Four people ordered links from the Spares Company and had them sent to me while others looked around for second hand links. It turned out that the SC was out of stock of these links and that had been the case for some time. I can't remember exactly how long the delay was but about two months. When they did finally turn up two were so badly machined that they had to go back and be exchanged. I have now had to work on quite a lot of new lower links and if you have never seen one you will get quite a shock. They are supplied as cast with surface rust. The only machining that has been done is on the places where is has to be done and there has been no attempt to smooth, or even polish, the other surfaces let alone paint them. I have also worked on some of the original seventy years old ones and on those all the surfaces have been smoothed, possibly polished. Because of the supply problem I offered to do some design work and get a price for getting some new ones made by CNC machining. There was no interest. With that as a background I was wondering if this might be a path that would work for the modified Bramptons. The idea is that in consultation with those who have Bramptons and who might already have them modified it should be possible to design new lower links with the fitting for a lower attachment point for a coil over damper unit. This way no old links would be modified and the design could be optimised to allow the fitting of some as yet unspecified suspension unit. The problems I foresee are how many would be required and is it possible to find a consensus as to the design parameters? I assume that the originals would have been forgings but things have moved on enough that we now have girdraulic fork blades machined from extrusions so it is possible that there are now steel specifications whose use would allow the same to be done with the lower links. Thoughts please. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton forks
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