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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing Gear Noise
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<blockquote data-quote="oexing" data-source="post: 123375" data-attributes="member: 1493"><p>Peter, hard to say how much of run-out of gear form one can lap with paste on gear teeth. You´d have to set up a machine for gear lapping as is done on spiral bevel gears for milling machines or so. I just mounted cam gears and large idler in the engine case with that amount of preload as you can do when bolting up the idler and its three nuts. By turning the lot with fingers you can feel and hear any tight spots so I tried the lapping exercise and after some time things got smooth, mainly getting smoother finish on teeth flanks after lapping off any light preload. . The gear on the crank end was machined to size later after measuring centers of crank to idler shaft. Same with the alu gear for the magneto, home made for the Beetle mag, made by Ronco, Vertex, Scintilla and its cam mod for 50 degree engine. </p><p> The cams with gears came from Andrews and were quite good and the idler modded for a standard needle gear. In every case best to check over pins in the lathe what runout the gear cutting may have and try to rectify accordingly as good as you can. It is a gamble anyway, you never know what you get when having spare parts. In machine tools - lathes - gears are precision ground after heat treating - would be nice for the large idler too , as with that size it will be out of shape most likely. Well , somebody in retirement can spend all his time on things like here, the project has started 30 years ago, so not a quick job really . . . .</p><p></p><p> Vic</p><p></p><p>[ATTACH=full]35793[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 123375, member: 1493"] Peter, hard to say how much of run-out of gear form one can lap with paste on gear teeth. You´d have to set up a machine for gear lapping as is done on spiral bevel gears for milling machines or so. I just mounted cam gears and large idler in the engine case with that amount of preload as you can do when bolting up the idler and its three nuts. By turning the lot with fingers you can feel and hear any tight spots so I tried the lapping exercise and after some time things got smooth, mainly getting smoother finish on teeth flanks after lapping off any light preload. . The gear on the crank end was machined to size later after measuring centers of crank to idler shaft. Same with the alu gear for the magneto, home made for the Beetle mag, made by Ronco, Vertex, Scintilla and its cam mod for 50 degree engine. The cams with gears came from Andrews and were quite good and the idler modded for a standard needle gear. In every case best to check over pins in the lathe what runout the gear cutting may have and try to rectify accordingly as good as you can. It is a gamble anyway, you never know what you get when having spare parts. In machine tools - lathes - gears are precision ground after heat treating - would be nice for the large idler too , as with that size it will be out of shape most likely. Well , somebody in retirement can spend all his time on things like here, the project has started 30 years ago, so not a quick job really . . . . Vic [ATTACH type="full"]35793[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing Gear Noise
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