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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="Deleted member 3831" data-source="post: 90871"><p>Time Traveller</p><p> my illustration of a Rudge cam has a feature which might be useful in explaining a point.</p><p>Because it has a radius that blends the tangent to the blending radius, the follower must also be of a radius type to properly follow the profile.</p><p>Now assume that there is no blending radius, there are two circles, base and nose, connected by tangents.</p><p>Starting with the base circle centred under the flat follower, as the cam rotates so the contact moves off the central position until the point is reached where for one brief instance, the flat of the tangent is in contact with the follower. The following instance sees the contact at the end of the tangent where it meets the nose circle, and from there the contact will come back to the centre of the follower as the cam is further rotated. </p><p>These sequences are then repeated in reverse as the cam further rotates until the cam finally ends up at the original starting position</p><p></p><p>My previous comments have assumed that in all instances a practical approach is made to the question of cam design, although as I have mentioned in an earlier post, it is actually incorrect to use the term 'cam design', the correct term is 'valve lift design', and following such design then a cam form must be devised that will enable that valve lift design to be realised. </p><p></p><p>passenger 0_0 gives an example based of Robert Norton's model that ends with something totally impossible to make, in simple terms, not practical. I wonder at the valve lift design that the model was meant to represent</p><p></p><p>Greg and David</p><p> if you go to Phillip Island to watch the Classic races, all the Winfield machines have my cam designs installed, and have had them for the last three years. These races though may see the winners laurels return to Australia through the efforts of the Horner Brother's Irving Vincents and their roller cam followers.</p></blockquote><p></p>
[QUOTE="Deleted member 3831, post: 90871"] Time Traveller my illustration of a Rudge cam has a feature which might be useful in explaining a point. Because it has a radius that blends the tangent to the blending radius, the follower must also be of a radius type to properly follow the profile. Now assume that there is no blending radius, there are two circles, base and nose, connected by tangents. Starting with the base circle centred under the flat follower, as the cam rotates so the contact moves off the central position until the point is reached where for one brief instance, the flat of the tangent is in contact with the follower. The following instance sees the contact at the end of the tangent where it meets the nose circle, and from there the contact will come back to the centre of the follower as the cam is further rotated. These sequences are then repeated in reverse as the cam further rotates until the cam finally ends up at the original starting position My previous comments have assumed that in all instances a practical approach is made to the question of cam design, although as I have mentioned in an earlier post, it is actually incorrect to use the term 'cam design', the correct term is 'valve lift design', and following such design then a cam form must be devised that will enable that valve lift design to be realised. passenger 0_0 gives an example based of Robert Norton's model that ends with something totally impossible to make, in simple terms, not practical. I wonder at the valve lift design that the model was meant to represent Greg and David if you go to Phillip Island to watch the Classic races, all the Winfield machines have my cam designs installed, and have had them for the last three years. These races though may see the winners laurels return to Australia through the efforts of the Horner Brother's Irving Vincents and their roller cam followers. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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