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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Part # 327
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<blockquote data-quote="Magnetoman" data-source="post: 158957" data-attributes="member: 2806"><p>Them's fightin' words, fellah. Since we're only dealing with crudely-made Vincents I didn't deploy precision instrumentation when writing my previous post. A punch marked 5/16" would not enter the hole, but a letter punch marked N would, so to get the measurement I reported I used calipers, crude though that instrument is.</p><p></p><p>[ATTACH=full]51098[/ATTACH]</p><p></p><p>But, since my quantification now has been qualifiedly-questioned, I got serious. The next photograph shows I first confirmed the calibration of my 3-point internal micrometer is accurate to 0.0001".</p><p></p><p>[ATTACH=full]51099[/ATTACH]</p><p></p><p>The next photograph shows the ID of the hole is 0.3117", which unqualifiedly is less than 0.3125".</p><p></p><p>[ATTACH=full]51100[/ATTACH]</p><p></p><p>The next photograph shows, using a calibrated micrometer, that the OD of the shank of the bolt is 0.3074", so it goes in the hole with clearance of 0.0043" (nb. the final photograph provides circumstantial evidence for this claim of the relative sizes).</p><p></p><p>[ATTACH=full]51101[/ATTACH]</p><p></p><p>This means the crudely-made Vincent's seat can rattle up and down by 0.002", which I'm sure would be unacceptable by even BSA Bantam standards. Personally, I'm shocked by this shoddy workmanship.</p><p></p><p>For those who question whether 0.3074" actually is less than 0.3117", the final photograph shows the bolt does indeed go into the hole.</p><p></p><p>[ATTACH=full]51102[/ATTACH]</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 158957, member: 2806"] Them's fightin' words, fellah. Since we're only dealing with crudely-made Vincents I didn't deploy precision instrumentation when writing my previous post. A punch marked 5/16" would not enter the hole, but a letter punch marked N would, so to get the measurement I reported I used calipers, crude though that instrument is. [ATTACH type="full"]51098[/ATTACH] But, since my quantification now has been qualifiedly-questioned, I got serious. The next photograph shows I first confirmed the calibration of my 3-point internal micrometer is accurate to 0.0001". [ATTACH type="full"]51099[/ATTACH] The next photograph shows the ID of the hole is 0.3117", which unqualifiedly is less than 0.3125". [ATTACH type="full"]51100[/ATTACH] The next photograph shows, using a calibrated micrometer, that the OD of the shank of the bolt is 0.3074", so it goes in the hole with clearance of 0.0043" (nb. the final photograph provides circumstantial evidence for this claim of the relative sizes). [ATTACH type="full"]51101[/ATTACH] This means the crudely-made Vincent's seat can rattle up and down by 0.002", which I'm sure would be unacceptable by even BSA Bantam standards. Personally, I'm shocked by this shoddy workmanship. For those who question whether 0.3074" actually is less than 0.3117", the final photograph shows the bolt does indeed go into the hole. [ATTACH type="full"]51102[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Part # 327
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