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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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<blockquote data-quote="timetraveller" data-source="post: 105122" data-attributes="member: 456"><p>I could also send some cams to Grey One but do not want to overburden him following his generous offer. However, one needs to have a jig, or a spare Vincent engine, to ensure that the cam to follower geometry, and the rocker geometry are faithfully reproduced.</p><p></p><p>Eight decimal places! That is one hundredth of one millionth of an inch. When I was a young astronomer one of my jobs was to measure the positions of star images on glass photographic plates. In those days we were measuring to one micron and the mechanical measuring machines were state of the art. This is long before the advent of Moiré fringe digitisers, which is what I assume Grey One has access to. I remember visiting the metrology lab of an engineering company years ago. I was given an interesting demo. In this temperature controlled environment the chap set up a 'depth' gauge on top of a piece of steel and then put a finger on each side of the piece of steel. You could see the gauge move almost at once and then continuously as the heat from his fingers caused the steel to expand. Its a wonderful world if one has the right gadgets and the knowledge to use them properly.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="timetraveller, post: 105122, member: 456"] I could also send some cams to Grey One but do not want to overburden him following his generous offer. However, one needs to have a jig, or a spare Vincent engine, to ensure that the cam to follower geometry, and the rocker geometry are faithfully reproduced. Eight decimal places! That is one hundredth of one millionth of an inch. When I was a young astronomer one of my jobs was to measure the positions of star images on glass photographic plates. In those days we were measuring to one micron and the mechanical measuring machines were state of the art. This is long before the advent of Moiré fringe digitisers, which is what I assume Grey One has access to. I remember visiting the metrology lab of an engineering company years ago. I was given an interesting demo. In this temperature controlled environment the chap set up a 'depth' gauge on top of a piece of steel and then put a finger on each side of the piece of steel. You could see the gauge move almost at once and then continuously as the heat from his fingers caused the steel to expand. Its a wonderful world if one has the right gadgets and the knowledge to use them properly.:) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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