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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight inch brake ?
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<blockquote data-quote="timetraveller" data-source="post: 94537" data-attributes="member: 456"><p>OK. I was wrong and Hadronuk was right. Trevor's finding was that the pivots are too far out from the centre and not too far inwards. That could be compensated for by machining the pivot holes one mm further out from the cam end. What do people do when they machine the linings prior to fitting them into the drums? In my case I made up a fitting which will fit into a three jaw chuck on the lathe and machine from that centre. I think that should be an improvement but what do others think? The other thing which I always emphasise is that when using ali brake plates the hole in the centre should be at least 2 mm larger than the diameter of the hollow axle. This goes back to the original Vincent 'Work Sheets' where such a method was advocated by the works. Remember that with the ali plates there are no thin nuts. The idea is that the brakes are applied hard before the tommy bar axle is tightened and this allows the brake plate plus shoes to centre themselves in the drum. It works for me but whether the brakes are as good as they could be if the geometry was correct in the first place can only be determined by experiment.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 94537, member: 456"] OK. I was wrong and Hadronuk was right. Trevor's finding was that the pivots are too far out from the centre and not too far inwards. That could be compensated for by machining the pivot holes one mm further out from the cam end. What do people do when they machine the linings prior to fitting them into the drums? In my case I made up a fitting which will fit into a three jaw chuck on the lathe and machine from that centre. I think that should be an improvement but what do others think? The other thing which I always emphasise is that when using ali brake plates the hole in the centre should be at least 2 mm larger than the diameter of the hollow axle. This goes back to the original Vincent 'Work Sheets' where such a method was advocated by the works. Remember that with the ali plates there are no thin nuts. The idea is that the brakes are applied hard before the tommy bar axle is tightened and this allows the brake plate plus shoes to centre themselves in the drum. It works for me but whether the brakes are as good as they could be if the geometry was correct in the first place can only be determined by experiment. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight inch brake ?
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