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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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<blockquote data-quote="oexing" data-source="post: 115709" data-attributes="member: 1493"><p>Regarding dynamic balancing, I got another two SR 500 cranks for balancing and tried to do videos about this action. I have just uploaded them into youtube, see link below. Please read the description under the video there for more info. </p><p> Amazing how far off these cranks are because of forging or casting processes. I did not dare to go over 1000 rpm at first try for fear of having the crank vacate my test rig with vibrations. I am still in learning mode with the electronics and want to see what low limits I can achieve . When aiming for under one gramm unbalance I spend quite some time on this as angular positions are only by eye and hand drill machining on the test rig itself. So I start with adding small magnets that I can shift to see what that does to results. Finally there are stacks of magnets to show me what amount of steel I got to drill out at the opposite positions for the real balancing. Yes, the test electronics like lots of inputs about diameter of crank webs, if radial drilling or axial, what size of drill , what sort of metal is to be drilled, andso on. So I basically get all info for quick balancing - but in real life you sometimes do not want to drill exactly in proposed positions on a crank web in any case so you go for compromises and some - or more - trial and error till you are happy with the job. To be open, I could easily much earlier declare the job done and fit for purpose really. But this is some sports for me to see fractions of one gram finally for satisfaction.</p><p> In case of Vincent cranks I don´t think you´d feel a dramatic difference after electronic balancing as all parts of the crank were machined to decent tolerances I guess, but then you cannot know. So a rough engine may have other defects, wrong balance factor one of these.</p><p></p><p> Vic</p><p>Edit: Sorry, seems I uploaded one clip twice in youtube, so you may want to go faster forward a bit.</p><p></p><p><a href="https://www.youtube.com/watch?v=bc51tInHmPs" target="_blank">SR 500 crank dynamic balancing</a></p><p></p><p>[ATTACH=full]32124[/ATTACH]</p><p></p><p>[ATTACH=full]32125[/ATTACH]</p><p></p><p>[ATTACH=full]32126[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 115709, member: 1493"] Regarding dynamic balancing, I got another two SR 500 cranks for balancing and tried to do videos about this action. I have just uploaded them into youtube, see link below. Please read the description under the video there for more info. Amazing how far off these cranks are because of forging or casting processes. I did not dare to go over 1000 rpm at first try for fear of having the crank vacate my test rig with vibrations. I am still in learning mode with the electronics and want to see what low limits I can achieve . When aiming for under one gramm unbalance I spend quite some time on this as angular positions are only by eye and hand drill machining on the test rig itself. So I start with adding small magnets that I can shift to see what that does to results. Finally there are stacks of magnets to show me what amount of steel I got to drill out at the opposite positions for the real balancing. Yes, the test electronics like lots of inputs about diameter of crank webs, if radial drilling or axial, what size of drill , what sort of metal is to be drilled, andso on. So I basically get all info for quick balancing - but in real life you sometimes do not want to drill exactly in proposed positions on a crank web in any case so you go for compromises and some - or more - trial and error till you are happy with the job. To be open, I could easily much earlier declare the job done and fit for purpose really. But this is some sports for me to see fractions of one gram finally for satisfaction. In case of Vincent cranks I don´t think you´d feel a dramatic difference after electronic balancing as all parts of the crank were machined to decent tolerances I guess, but then you cannot know. So a rough engine may have other defects, wrong balance factor one of these. Vic Edit: Sorry, seems I uploaded one clip twice in youtube, so you may want to go faster forward a bit. [URL='https://www.youtube.com/watch?v=bc51tInHmPs']SR 500 crank dynamic balancing[/URL] [ATTACH type="full" alt="P1070585.JPG"]32124[/ATTACH] [ATTACH type="full" alt="P1070224.JPG"]32125[/ATTACH] [ATTACH type="full" alt="P1070226.JPG"]32126[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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