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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: 99468" data-attributes="member: 456"><p>Just so there is no misunderstanding; no, or very little maths was involved. All I did was measure the distance from the damper body to the holder for the rose joint on the damper rod and rotated the steering head from fully right to fully left. To get some idea of angular measure I fastened (temporarily) a dynamo drive sprocket to the top of the steering head where the damper knob normally fits. The dynamo sprocket has 28 teeth which means that there is 12.8571 degrees between each tooth. A pointer was made up to allow visual indexing of the teeth. Clearly that is not as accurate as, say, a dividing head but was good enough to find out what was happening. The straight-ish line in the graph above is just the seven measurements from lock to lock, giving a total angular movement of about 77 degrees (call it 80). By taking the difference from one point to the next one gets the amount of movement on the damper rod between equal angles over the whole range. I have enlarged the lower graph and moved the angular movement to the values they should have in between the measured points. The graph and fitted curve are shown below. The centre of the movement, dead ahead, is at about 40 on the horizontal scale. Although there is some scatter about the curve due to the crude angular measurement is should be clear that one gets about 13 mm of damper rod movement for each 12 ish degreed of steering head movement in the dead ahead position and this reduces to about 9 to 10 mm near to the limits of the movement. I cannot guarantee that either Vincent's or Macvette's will be identical as they use slightly different geometry but I guess they will be near enough the same.</p><p>[ATTACH=full]23724[/ATTACH]</p></blockquote><p></p>
[QUOTE="timetraveller, post: 99468, member: 456"] Just so there is no misunderstanding; no, or very little maths was involved. All I did was measure the distance from the damper body to the holder for the rose joint on the damper rod and rotated the steering head from fully right to fully left. To get some idea of angular measure I fastened (temporarily) a dynamo drive sprocket to the top of the steering head where the damper knob normally fits. The dynamo sprocket has 28 teeth which means that there is 12.8571 degrees between each tooth. A pointer was made up to allow visual indexing of the teeth. Clearly that is not as accurate as, say, a dividing head but was good enough to find out what was happening. The straight-ish line in the graph above is just the seven measurements from lock to lock, giving a total angular movement of about 77 degrees (call it 80). By taking the difference from one point to the next one gets the amount of movement on the damper rod between equal angles over the whole range. I have enlarged the lower graph and moved the angular movement to the values they should have in between the measured points. The graph and fitted curve are shown below. The centre of the movement, dead ahead, is at about 40 on the horizontal scale. Although there is some scatter about the curve due to the crude angular measurement is should be clear that one gets about 13 mm of damper rod movement for each 12 ish degreed of steering head movement in the dead ahead position and this reduces to about 9 to 10 mm near to the limits of the movement. I cannot guarantee that either Vincent's or Macvette's will be identical as they use slightly different geometry but I guess they will be near enough the same. [ATTACH=full]23724[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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