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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Flywheel Fit
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<blockquote data-quote="powella" data-source="post: 144883" data-attributes="member: 1609"><p>Could I ask for opinions please on the following problem.</p><p>The fit of the crankpin into the flywheel should be , Pin at 1.002 and hole in wheel at 1.000 - giving a fitting pressure of approx 6 tons.</p><p>As can be seen from the photo`s the test bar at 1.001 is " not right "!!</p><p>The Go - No Go gauge in Brass ( smoother surface ) has various diameters of 1.001 , 1.003 and 1.006. As can be seen at 1.006 the gauge disappears. The Timing side is correct at 1.000 ( and a bit )</p><p>Several solutions come to mind one being to bore out the hole in the wheel and weld in a insert as per the Drawing. There is probably another 1/16 inch to be had on the outside Diameter of the insert. Using the large Diameter of the Nut recess as a register this can then be bored out to 1.000.</p><p>Solution two is to weld " strips " across from front to back ,finishing with a circular run front and back. Face off and bore out.</p><p>If you are not already asleep these next points are important </p><p> !. I / We will not buy a new oversize pin at 1.125 since we already have a perfectly good ,new Vincent Big End assembly</p><p> 2 I / We will not buy a new wheel since - in the words of Mr Dunn " unless its a pile of ash everything is salvageable " This oversized hole is just an engineering challenge.</p><p> 3 I / We have access to ( in order of priority ) Single malt , Coffee and Cake , A Bridgeport Milling Machine , a BIG Colchester Lathe , MIG , TIIG , Gas and arc welders </p><p>And a bucket of inspiration ( empty ).</p><p> Comments please . Thanks.[ATTACH=full]44802[/ATTACH][ATTACH=full]44803[/ATTACH][ATTACH=full]44804[/ATTACH][ATTACH=full]44805[/ATTACH][ATTACH]44802[/ATTACH][ATTACH]44803[/ATTACH][ATTACH]44804[/ATTACH][ATTACH]44805[/ATTACH][ATTACH=full]44802[/ATTACH][ATTACH]44803[/ATTACH][ATTACH]44804[/ATTACH][ATTACH]44805[/ATTACH]</p></blockquote><p></p>
[QUOTE="powella, post: 144883, member: 1609"] Could I ask for opinions please on the following problem. The fit of the crankpin into the flywheel should be , Pin at 1.002 and hole in wheel at 1.000 - giving a fitting pressure of approx 6 tons. As can be seen from the photo`s the test bar at 1.001 is " not right "!! The Go - No Go gauge in Brass ( smoother surface ) has various diameters of 1.001 , 1.003 and 1.006. As can be seen at 1.006 the gauge disappears. The Timing side is correct at 1.000 ( and a bit ) Several solutions come to mind one being to bore out the hole in the wheel and weld in a insert as per the Drawing. There is probably another 1/16 inch to be had on the outside Diameter of the insert. Using the large Diameter of the Nut recess as a register this can then be bored out to 1.000. Solution two is to weld " strips " across from front to back ,finishing with a circular run front and back. Face off and bore out. If you are not already asleep these next points are important !. I / We will not buy a new oversize pin at 1.125 since we already have a perfectly good ,new Vincent Big End assembly 2 I / We will not buy a new wheel since - in the words of Mr Dunn " unless its a pile of ash everything is salvageable " This oversized hole is just an engineering challenge. 3 I / We have access to ( in order of priority ) Single malt , Coffee and Cake , A Bridgeport Milling Machine , a BIG Colchester Lathe , MIG , TIIG , Gas and arc welders And a bucket of inspiration ( empty ). Comments please . Thanks.[ATTACH type="full"]44802[/ATTACH][ATTACH type="full"]44803[/ATTACH][ATTACH type="full"]44804[/ATTACH][ATTACH type="full"]44805[/ATTACH][ATTACH]44802[/ATTACH][ATTACH]44803[/ATTACH][ATTACH]44804[/ATTACH][ATTACH]44805[/ATTACH][ATTACH type="full"]44802[/ATTACH][ATTACH]44803[/ATTACH][ATTACH]44804[/ATTACH][ATTACH]44805[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Flywheel Fit
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