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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
oil holes in Crank pin?
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<blockquote data-quote="oexing" data-source="post: 173338" data-attributes="member: 1493"><p>Vincents do not have press fit crankpins for standard, but nice to have a shoulder on the crankpin that gets bolted up by fat nuts. Even so, not the best idea but sort of tradition and home maintenance suitable - within limits. </p><p> Hardened flywheels - not really, but very high tensile certainly and heat treated before finishing all sizes. </p><p> As to aligned cranks and press fits, yes Greg, good question. My cranks turned out quite tough after heat treatment, well as intended by my steel choice. But I was a bit worried about trueing the lot after all pressed up. So I got two ground steel plates plus guide pins long enough , ca. 20 mm dia., from the toolroom suppliers no problem . So basically you place the two plates together on the mill with parallels below and drill and ream just three holes in one setup. Two reamed bores on one side with 20mm reamer for nice push fit - plus another bore with nice push fit for mainshaft diameters , like 1 " or in my case 30 mm . That way the lot will end up with mainshafts within say 0.06mm offset like I got on both cranks. The crankpin will find into the matching bores anyway so no more extras to have in the two plates. </p><p> In the end I was unable to hit the pressed up cranks for close to zero runout checked on mainshat ends and had to place the lot under the hydraulic press with rounds stuck in balancing holes somehow for twisting them to have like zero runout. Remember 40 mm crankpin and very high tensile webs and press fit at ca. 15 tons or more. Somebody younger may have hit the lot harder than myself possibly for common trueing. </p><p> See photos for getting the idea below. </p><p> For a friend we modded the Vincent version for the SR 500/XT cranks and bored the mainshaft position to 35 mm , one side. So still you could have an adapter return the jig to Vincent sizes - or other brands. Good enough anyway and quite useful , not just checks by eye and square in the press.</p><p></p><p> Vic</p><p><a href="https://www.youtube.com/watch?v=1p1gYmmwr1s" target="_blank">crank check</a></p><p></p><p><a href="https://www.youtube.com/watch?v=A_h9m3NWmr4" target="_blank">timing side</a></p><p></p><p>[ATTACH=full]59731[/ATTACH]</p><p></p><p>timing side oil holes 90 degrees past TDC:</p><p>[ATTACH=full]59732[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 173338, member: 1493"] Vincents do not have press fit crankpins for standard, but nice to have a shoulder on the crankpin that gets bolted up by fat nuts. Even so, not the best idea but sort of tradition and home maintenance suitable - within limits. Hardened flywheels - not really, but very high tensile certainly and heat treated before finishing all sizes. As to aligned cranks and press fits, yes Greg, good question. My cranks turned out quite tough after heat treatment, well as intended by my steel choice. But I was a bit worried about trueing the lot after all pressed up. So I got two ground steel plates plus guide pins long enough , ca. 20 mm dia., from the toolroom suppliers no problem . So basically you place the two plates together on the mill with parallels below and drill and ream just three holes in one setup. Two reamed bores on one side with 20mm reamer for nice push fit - plus another bore with nice push fit for mainshaft diameters , like 1 " or in my case 30 mm . That way the lot will end up with mainshafts within say 0.06mm offset like I got on both cranks. The crankpin will find into the matching bores anyway so no more extras to have in the two plates. In the end I was unable to hit the pressed up cranks for close to zero runout checked on mainshat ends and had to place the lot under the hydraulic press with rounds stuck in balancing holes somehow for twisting them to have like zero runout. Remember 40 mm crankpin and very high tensile webs and press fit at ca. 15 tons or more. Somebody younger may have hit the lot harder than myself possibly for common trueing. See photos for getting the idea below. For a friend we modded the Vincent version for the SR 500/XT cranks and bored the mainshaft position to 35 mm , one side. So still you could have an adapter return the jig to Vincent sizes - or other brands. Good enough anyway and quite useful , not just checks by eye and square in the press. Vic [URL='https://www.youtube.com/watch?v=1p1gYmmwr1s']crank check[/URL] [URL='https://www.youtube.com/watch?v=A_h9m3NWmr4']timing side[/URL] [ATTACH type="full"]59731[/ATTACH] timing side oil holes 90 degrees past TDC: [ATTACH type="full"]59732[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
oil holes in Crank pin?
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