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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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<blockquote data-quote="Deleted member 3831" data-source="post: 105307"><p>TT</p><p>I actually applaud what you've done in trying to get yourself an understanding of cam design. There can't be many working in astronomy with similar interests that you can converse with I'm sure. </p><p></p><p>All my life I've been involved with racing where petrol engines of various types provided the motive power, four wheels, three wheels, two wheels and even F1 power boats. </p><p>I should stress that what I've discussed on this particular post is based on how I tackle a new design, and the criteria I deem important. If you are happy with your present way of working, keep at it, but I hope I've been able to show that there can be more to it if you're so inclined.</p><p></p><p>Whereas you are working with a camshaft containing lobes fixed in position, I can make any number of variations in position, and mix and match lobes in a simulator program when working on an engine development project. A final decision will be made and the relevant cam files will go to the company to be ground up, with details attached to advise of the amount of lobe separation desired. These files always start with the maximum lift, or nose position, designated as zero. On a multiple cam shaft, this becomes an indexing point of reference for all the other cams</p><p></p><p>Getting cams ground up can be a problem because the good cam shops are usually expensive, and are loathe to take on just a couple of cams, they would much prefer to work in 100's. If you have designed your cams for use with a follower that has a radiussed pad, you may well have a negative component in the flanks which might just require a smaller grind wheel than is normally used.</p><p></p><p>Finaly I would query the number of Vincent cams that are around today, are they copies, if so, copies of what ? If the cam is caimed to be a new one, where did it come from. There are obviously new MK1 and MK2 profiles available, but it seems that by now they are likely to be third or fourth generation copies, and by now some of the original design may well have become corrupted or changed</p><p>Is there any such thing as a standard profile of whatever mark that can serve as a master for future cams to be copied from?</p></blockquote><p></p>
[QUOTE="Deleted member 3831, post: 105307"] TT I actually applaud what you've done in trying to get yourself an understanding of cam design. There can't be many working in astronomy with similar interests that you can converse with I'm sure. All my life I've been involved with racing where petrol engines of various types provided the motive power, four wheels, three wheels, two wheels and even F1 power boats. I should stress that what I've discussed on this particular post is based on how I tackle a new design, and the criteria I deem important. If you are happy with your present way of working, keep at it, but I hope I've been able to show that there can be more to it if you're so inclined. Whereas you are working with a camshaft containing lobes fixed in position, I can make any number of variations in position, and mix and match lobes in a simulator program when working on an engine development project. A final decision will be made and the relevant cam files will go to the company to be ground up, with details attached to advise of the amount of lobe separation desired. These files always start with the maximum lift, or nose position, designated as zero. On a multiple cam shaft, this becomes an indexing point of reference for all the other cams Getting cams ground up can be a problem because the good cam shops are usually expensive, and are loathe to take on just a couple of cams, they would much prefer to work in 100's. If you have designed your cams for use with a follower that has a radiussed pad, you may well have a negative component in the flanks which might just require a smaller grind wheel than is normally used. Finaly I would query the number of Vincent cams that are around today, are they copies, if so, copies of what ? If the cam is caimed to be a new one, where did it come from. There are obviously new MK1 and MK2 profiles available, but it seems that by now they are likely to be third or fourth generation copies, and by now some of the original design may well have become corrupted or changed Is there any such thing as a standard profile of whatever mark that can serve as a master for future cams to be copied from? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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