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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
shadow brake drums.....
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<blockquote data-quote="1660bob" data-source="post: 25141" data-attributes="member: 366"><p>Hi All,</p><p>having recently built up my wheels with new drums(VOC) I fitted front wheel to forks yesterday to check the fit clearences in relation to my alloy brake plates.Imagine my horror as I spun the wheel to see the ribs on both drums oscillating side to side in relation to the stationary brake plate edge.The drums are distorted/misaligned by an alarming amount-so much so that the brake shoes catch heavily at one point, but free off for the rest of a wheel turn. The distortion is easily visible as the wheel spins-I can not figure where i went wrong-I cleaned meticulously around all of the mating faces of hub/spoke ring/drum etc so i am happy nothing is trapped under the flanges.The hub appeared fine-i.e. no visible damage.Spoke rings are original and seem OK.The only thing i can think is the drums have somehow distorted as the bolts, in some instances a very tight fit, were tightened. I know nothing is perfect but the run out seems excessive- I had the drums powder coated prior to assy. but surely the heat could not distort them?(two of them were powder coated from VOC in any case but it was poor so i had all four re-done to match.Any Ideas,cheers, Bob.</p></blockquote><p></p>
[QUOTE="1660bob, post: 25141, member: 366"] Hi All, having recently built up my wheels with new drums(VOC) I fitted front wheel to forks yesterday to check the fit clearences in relation to my alloy brake plates.Imagine my horror as I spun the wheel to see the ribs on both drums oscillating side to side in relation to the stationary brake plate edge.The drums are distorted/misaligned by an alarming amount-so much so that the brake shoes catch heavily at one point, but free off for the rest of a wheel turn. The distortion is easily visible as the wheel spins-I can not figure where i went wrong-I cleaned meticulously around all of the mating faces of hub/spoke ring/drum etc so i am happy nothing is trapped under the flanges.The hub appeared fine-i.e. no visible damage.Spoke rings are original and seem OK.The only thing i can think is the drums have somehow distorted as the bolts, in some instances a very tight fit, were tightened. I know nothing is perfect but the run out seems excessive- I had the drums powder coated prior to assy. but surely the heat could not distort them?(two of them were powder coated from VOC in any case but it was poor so i had all four re-done to match.Any Ideas,cheers, Bob. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
shadow brake drums.....
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