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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oval Slots
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<blockquote data-quote="Pushrod Twin" data-source="post: 177059" data-attributes="member: 340"><p>There is not an over abundance of material to counterbore around the case studs, even for 3/8" dowels, which would have very thin walls. Although we no longer regard it as "best engineering practice" it was not uncommon for engineers to use "fitted" bolts with close tolerance holes, even in aircraft. These have all had close to 70 years of hard work, and in many cases, (pun intended) abuse with the nuts loosely neglected etc so it should come as no surprise to discover the bolt holes are oval. I have 3 Comet boxes to administer to over the next few weeks, I will give some thought to dowels, at both ends of some studs, as they pass through the sandwiched centre casing .<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> [ATTACH=full]61203[/ATTACH]</p></blockquote><p></p>
[QUOTE="Pushrod Twin, post: 177059, member: 340"] There is not an over abundance of material to counterbore around the case studs, even for 3/8" dowels, which would have very thin walls. Although we no longer regard it as "best engineering practice" it was not uncommon for engineers to use "fitted" bolts with close tolerance holes, even in aircraft. These have all had close to 70 years of hard work, and in many cases, (pun intended) abuse with the nuts loosely neglected etc so it should come as no surprise to discover the bolt holes are oval. I have 3 Comet boxes to administer to over the next few weeks, I will give some thought to dowels, at both ends of some studs, as they pass through the sandwiched centre casing .:) [ATTACH type="full"]61203[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oval Slots
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