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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Max's Brake Tips
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<blockquote data-quote="clevtrev" data-source="post: 50183" data-attributes="member: 187"><p>Machining with a spacer in the cam face, only doubles the error when its`s assembled. You need to grasp geometry to be able to understand what actually happens. But I have a cutaway set up that shows exactly what happens, so you can see the shoe bending. Just for example you turn the shoe with a ten thou shim in there, then turn to give five thou clearance, that means that when you remove the shim there will be 15 thou clearance at the cam, but five thou at the pivot. So on operation the cam will move the shoe, the pivot end will touch before the cam end. </p><p>Personally I think it would be better to turn the shoe with ten thou clearance, then ADD a shim of five thou. on assembly. </p><p></p><p>Think about levers and loads, when the cam is applied, that should be the place that it touches first, adjacent to the cam. so how can a brake plate distort, only when the load is somewhere else. Would you believe it`s at the pivot pin ?</p><p></p><p>Once again I`ll ask the experts to advise, but remember, it`s your brakes.</p></blockquote><p></p>
[QUOTE="clevtrev, post: 50183, member: 187"] Machining with a spacer in the cam face, only doubles the error when its`s assembled. You need to grasp geometry to be able to understand what actually happens. But I have a cutaway set up that shows exactly what happens, so you can see the shoe bending. Just for example you turn the shoe with a ten thou shim in there, then turn to give five thou clearance, that means that when you remove the shim there will be 15 thou clearance at the cam, but five thou at the pivot. So on operation the cam will move the shoe, the pivot end will touch before the cam end. Personally I think it would be better to turn the shoe with ten thou clearance, then ADD a shim of five thou. on assembly. Think about levers and loads, when the cam is applied, that should be the place that it touches first, adjacent to the cam. so how can a brake plate distort, only when the load is somewhere else. Would you believe it`s at the pivot pin ? Once again I`ll ask the experts to advise, but remember, it`s your brakes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Max's Brake Tips
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