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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 106101" data-attributes="member: 456"><p>Thanks to Gary for his kind comments. Regarding packing with a nylon washer; there are different grades of nylon so I cannot be sure that the one which Gary has access to will last. It would certainly do for a test and probably a steel washer between the nylon and the spring itself would help. This leads to an interesting matter regarding pre-load and spring rate. Gary removed half an inch from each spring which is the equivalent of removing one inch from one, i.e. 36 lbs of pre-load. The pre-load with the full length 36 lbs/inch springs is 216 lbs so a reduction of 36 lbs is 16%. Removing half of the one inch spring length reduction is going to reduce that to 8%. That kind of adjustability is why I designed the adjustable length inner spring box but, as above, I have still failed to find a supplier of the correct tube. I wanted to use stainless steel and at the GCM I asked Ian Savage who it is that supplies the Club Shop with these items. It turns out that it is Colin Taylor, who lives in Italy, probably uses metric tubing and who's name is not in the Confidential Admin List. I guess he is not a member. At the moment the best that I can come up with is to buy tube with the correct inner diameter, just over one inch, and then cylindrically grind the outer down to the correct size. I can find people to do that but there really ought to be an easier way.</p><p>Remember, it is only by this kind of feedback that the system can be improved so thanks to all who have provided feed back.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 106101, member: 456"] Thanks to Gary for his kind comments. Regarding packing with a nylon washer; there are different grades of nylon so I cannot be sure that the one which Gary has access to will last. It would certainly do for a test and probably a steel washer between the nylon and the spring itself would help. This leads to an interesting matter regarding pre-load and spring rate. Gary removed half an inch from each spring which is the equivalent of removing one inch from one, i.e. 36 lbs of pre-load. The pre-load with the full length 36 lbs/inch springs is 216 lbs so a reduction of 36 lbs is 16%. Removing half of the one inch spring length reduction is going to reduce that to 8%. That kind of adjustability is why I designed the adjustable length inner spring box but, as above, I have still failed to find a supplier of the correct tube. I wanted to use stainless steel and at the GCM I asked Ian Savage who it is that supplies the Club Shop with these items. It turns out that it is Colin Taylor, who lives in Italy, probably uses metric tubing and who's name is not in the Confidential Admin List. I guess he is not a member. At the moment the best that I can come up with is to buy tube with the correct inner diameter, just over one inch, and then cylindrically grind the outer down to the correct size. I can find people to do that but there really ought to be an easier way. Remember, it is only by this kind of feedback that the system can be improved so thanks to all who have provided feed back. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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