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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Interesting big end...
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<blockquote data-quote="oexing" data-source="post: 99385" data-attributes="member: 1493"><p>Roy, </p><p>I did the splines with an 4 mm end mill radiused at the corner a bit. But there are no flat faces here , did the correct radii in small steps with the dividing head and went for perfect fits in all corresponding faces within the splines - in all splines and there are a few in a Vincent engine and gear box. So I did not get new spares mostly but chose to laser weld all splines and do them up with a hf spindle on the manual mill. I must have spent minmum a whole day at the laser machine to build up all susceptible faces - not to speak of time to finish grind them. I am terrible at fits when it comes to splines so did not have much trust in new reproductions from the Spares Co to provide that kind of fit I´d accept. Most of you will know the effects a poor fit on splines does to components so no compromises for me. </p><p> I did not even think about looking for obsolete tools for doing these crank splines easily, not the faintest chance to find anything in my country. In that regard I did try to avoid any imperial sizes if I could help it, lots of Helicoils, metric bearings in most places, even modifying them for imperial shafts. Life is too short to mess around with finding imperial sizes at funny costs today. And I believe to be the last owner ever to repair these engines as I think all street use will be banned in a few decades, all political activities seem to confirm my view. So I feel very free to do as I like. I do my bikes as I like and don´t care much what others say but try to keep the "spirit" of the bike and time. </p><p> As to silver plated cages, a few days ago I looked at a replacement set of conrod and big end for a Yam SR 500 . Same type of steel caged INA needle bearing, silver plated. Can´t see much benefit in a four stroke engine, must be more of a two stroke thing I believe. There is a lot of oil supply in a SR big end for keeping the light cage floating on its oil film fighting the centrifugal forces there. Silver being a competent bearing material is pretty new to me ?? INA did silver plating on request for big companies long time ago, was not standard. But big needle bearings are no longer available since many years from INA . You´d have to look into China to find their supplier - as I did. </p><p></p><p> Vic</p><p>[ATTACH=full]23677[/ATTACH][ATTACH=full]23678[/ATTACH]</p><p></p><p>INA KZK big end bearings. The one at left is an older INA type, next right is last I got from INA here, 20 years ago. The two at the right side are from Chinese supplier, sizes 40/48/20 and 35/42/20 mm .</p><p>[ATTACH=full]23679[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 99385, member: 1493"] Roy, I did the splines with an 4 mm end mill radiused at the corner a bit. But there are no flat faces here , did the correct radii in small steps with the dividing head and went for perfect fits in all corresponding faces within the splines - in all splines and there are a few in a Vincent engine and gear box. So I did not get new spares mostly but chose to laser weld all splines and do them up with a hf spindle on the manual mill. I must have spent minmum a whole day at the laser machine to build up all susceptible faces - not to speak of time to finish grind them. I am terrible at fits when it comes to splines so did not have much trust in new reproductions from the Spares Co to provide that kind of fit I´d accept. Most of you will know the effects a poor fit on splines does to components so no compromises for me. I did not even think about looking for obsolete tools for doing these crank splines easily, not the faintest chance to find anything in my country. In that regard I did try to avoid any imperial sizes if I could help it, lots of Helicoils, metric bearings in most places, even modifying them for imperial shafts. Life is too short to mess around with finding imperial sizes at funny costs today. And I believe to be the last owner ever to repair these engines as I think all street use will be banned in a few decades, all political activities seem to confirm my view. So I feel very free to do as I like. I do my bikes as I like and don´t care much what others say but try to keep the "spirit" of the bike and time. As to silver plated cages, a few days ago I looked at a replacement set of conrod and big end for a Yam SR 500 . Same type of steel caged INA needle bearing, silver plated. Can´t see much benefit in a four stroke engine, must be more of a two stroke thing I believe. There is a lot of oil supply in a SR big end for keeping the light cage floating on its oil film fighting the centrifugal forces there. Silver being a competent bearing material is pretty new to me ?? INA did silver plating on request for big companies long time ago, was not standard. But big needle bearings are no longer available since many years from INA . You´d have to look into China to find their supplier - as I did. Vic [ATTACH=full]23677[/ATTACH][ATTACH=full]23678[/ATTACH] INA KZK big end bearings. The one at left is an older INA type, next right is last I got from INA here, 20 years ago. The two at the right side are from Chinese supplier, sizes 40/48/20 and 35/42/20 mm . [ATTACH=full]23679[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Interesting big end...
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