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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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<blockquote data-quote="timetraveller" data-source="post: 99809" data-attributes="member: 456"><p>OK Chaps, a few weeks ago I said that I would have a go at designing a hydraulic steering damper for the standard girdraulic steering head. Orders continue to come in for the item designed to go with the JE modification and as I am waiting for some parts to be machined for some alternator kits I decided now was the time.</p><p>Let us go back a bit and look at Vic's design, #29 above. I thought this was ingenious and it certainly stops some of the rotation of the damper body but I felt that it should be possible to do better than rely on the friction damper to resist the rotation of the new damper plate. If you look at the base of a standard steering head you will see that there is a short tube projecting downwards which locates the centre of the normal friction damper. It seemed to me that one should be able to use that, and the two holes at the front of the casting to make [ATTACH=full]23814[/ATTACH]a more secure location. I therefore made up a model of what I thought might work from some 3.5 mm thick ally plate and it looks like this. [ATTACH=full]23815[/ATTACH] Please note that this is all made by hand and uses in stock screws etc so please excuse the packers etc. My intention is that this plate would be located by the two screws/bolts at the front and some of the plates of the original friction damper holding the new plate securely over the raised tube.</p><p></p><p>When installed on a 'D' steering head it looks like this.[ATTACH=full]23816[/ATTACH] You can see that it clears all parts of the engine and a crash bar with ease but there is a problem. Vic had cleverly made and anchor for the end of the hydraulic arm that fitted into the sidecar fitting. If one has a crash bar (or sidecar) fitted then one has to use some other way. In the photograph the 'anchor' is just a couple of bits of wood but it allows me to work out the approximate distance from the crash bar, both fore and aft and up and down that the anchor point needs to be. Very roughly it is one inch in front of the front face of the crash bar and level with its base. Now it would be possible to design something to clamp around the crash bar but that raises another problem. The diameter of the round part of this crash bar (one of the good quality ones from either Maughan's or the Spares Co, machined from solid is 24.21 mm or 0.953". It is not clear that there is a standard diameter for crash bars. So it needs some input to decide whether one can come up with an anchor design to fit to a crash bar, even the enclosed 'D' crash bars, or whether it is gong to have to be some very clever clamping device that will fit a variety of diameters and be strong enough to withstand the force that might be imparted if a speed wobble did try to develop.</p><p></p><p>Having gone through the exercise with Vic's design I decided to go back to making a combination of my design for the JE steering head and the above. A new ally plate was made that has the lever arm like my earlier design for the JE system but is located like the above design. [ATTACH=full]23817[/ATTACH] Above is a picture of this alternative design on one lock and another picture of it on the other lock[ATTACH=full]23819[/ATTACH]. It suffers from the same problem at the system for the JE steering head in that there is more rotation of the damper body but it uses the same feature of mounting the damper body on a special bolt to fit into the original friction damper anchor pin. This means that it can use some of the same parts and thus keep the cost down. Mounted on a bike it looks like this [ATTACH=full]23818[/ATTACH] and clears all parts of the engine and the crash bar.</p><p></p><p>Both these designs allow most parts of the standard friction damper to be used to locate the new plate although the friction damper itself will be inoperative. I would make the plates from 4 mm thick stainless steel plate and get them CNC cut to ensure smooth curves and a nice polished edge.</p><p>Is there anyone out there who wants to stick with the standard steering head but who would like to have a low visibility hydraulic damper?</p></blockquote><p></p>
[QUOTE="timetraveller, post: 99809, member: 456"] OK Chaps, a few weeks ago I said that I would have a go at designing a hydraulic steering damper for the standard girdraulic steering head. Orders continue to come in for the item designed to go with the JE modification and as I am waiting for some parts to be machined for some alternator kits I decided now was the time. Let us go back a bit and look at Vic's design, #29 above. I thought this was ingenious and it certainly stops some of the rotation of the damper body but I felt that it should be possible to do better than rely on the friction damper to resist the rotation of the new damper plate. If you look at the base of a standard steering head you will see that there is a short tube projecting downwards which locates the centre of the normal friction damper. It seemed to me that one should be able to use that, and the two holes at the front of the casting to make [ATTACH=full]23814[/ATTACH]a more secure location. I therefore made up a model of what I thought might work from some 3.5 mm thick ally plate and it looks like this. [ATTACH=full]23815[/ATTACH] Please note that this is all made by hand and uses in stock screws etc so please excuse the packers etc. My intention is that this plate would be located by the two screws/bolts at the front and some of the plates of the original friction damper holding the new plate securely over the raised tube. When installed on a 'D' steering head it looks like this.[ATTACH=full]23816[/ATTACH] You can see that it clears all parts of the engine and a crash bar with ease but there is a problem. Vic had cleverly made and anchor for the end of the hydraulic arm that fitted into the sidecar fitting. If one has a crash bar (or sidecar) fitted then one has to use some other way. In the photograph the 'anchor' is just a couple of bits of wood but it allows me to work out the approximate distance from the crash bar, both fore and aft and up and down that the anchor point needs to be. Very roughly it is one inch in front of the front face of the crash bar and level with its base. Now it would be possible to design something to clamp around the crash bar but that raises another problem. The diameter of the round part of this crash bar (one of the good quality ones from either Maughan's or the Spares Co, machined from solid is 24.21 mm or 0.953". It is not clear that there is a standard diameter for crash bars. So it needs some input to decide whether one can come up with an anchor design to fit to a crash bar, even the enclosed 'D' crash bars, or whether it is gong to have to be some very clever clamping device that will fit a variety of diameters and be strong enough to withstand the force that might be imparted if a speed wobble did try to develop. Having gone through the exercise with Vic's design I decided to go back to making a combination of my design for the JE steering head and the above. A new ally plate was made that has the lever arm like my earlier design for the JE system but is located like the above design. [ATTACH=full]23817[/ATTACH] Above is a picture of this alternative design on one lock and another picture of it on the other lock[ATTACH=full]23819[/ATTACH]. It suffers from the same problem at the system for the JE steering head in that there is more rotation of the damper body but it uses the same feature of mounting the damper body on a special bolt to fit into the original friction damper anchor pin. This means that it can use some of the same parts and thus keep the cost down. Mounted on a bike it looks like this [ATTACH=full]23818[/ATTACH] and clears all parts of the engine and the crash bar. Both these designs allow most parts of the standard friction damper to be used to locate the new plate although the friction damper itself will be inoperative. I would make the plates from 4 mm thick stainless steel plate and get them CNC cut to ensure smooth curves and a nice polished edge. Is there anyone out there who wants to stick with the standard steering head but who would like to have a low visibility hydraulic damper? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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