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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: 173298" data-attributes="member: 1493"><p>You don´t talk about hours in projects like I do. The reconstruction started in 1988 or so and I did not note hours certainly. Since there were more projects in between that set times back for many years. </p><p> And as to calculating weights of components with a button press on the computer: In 1988 we had no computer in the company, never seen the like at that time. Company means boss and myself, and a Deckel FP 42 NC for programming on the machine , no CAD for decades and myself a complete idiot on CAD still - will never change I believe. All design of my conrods was a matter of paper and pen, some schoolboy trigonometry and pocket calculator for getting coordinates to feed into the CNC milling machine. </p><p> The job was started with milling a very oversize rough conrod - well, four of them - out of fat rounds of high tensile case hardening steel and have them carbonized but NOT hardened first. Then I did all final machining of shapes and polishing before having the conrods heat treated. This strategy produces a hard bigend bore and tensile strength for all other faces as all carbon loaded oversize material was machined off . So no need to protect most of any component just for carbonizing small areas that are going to have bearing hardness. </p><p> After heat treatment I did final polishing and having big end bearing sizes ground and lapped on the lathe. There are not a lot of places in engines where utmost precision is required but I am very attentive to bigend finish and clearances, so all diameters are diamond-lapped. </p><p></p><p> Vic</p><p></p><p>Lapping a Horex conrod for crowded needle bearing with cast iron plus diamond paste:</p><p></p><p>[ATTACH=full]59722[/ATTACH]</p><p></p><p>[ATTACH=full]59723[/ATTACH]</p><p></p><p>Lapped HRD conrods:</p><p></p><p>[ATTACH=full]59724[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 173298, member: 1493"] You don´t talk about hours in projects like I do. The reconstruction started in 1988 or so and I did not note hours certainly. Since there were more projects in between that set times back for many years. And as to calculating weights of components with a button press on the computer: In 1988 we had no computer in the company, never seen the like at that time. Company means boss and myself, and a Deckel FP 42 NC for programming on the machine , no CAD for decades and myself a complete idiot on CAD still - will never change I believe. All design of my conrods was a matter of paper and pen, some schoolboy trigonometry and pocket calculator for getting coordinates to feed into the CNC milling machine. The job was started with milling a very oversize rough conrod - well, four of them - out of fat rounds of high tensile case hardening steel and have them carbonized but NOT hardened first. Then I did all final machining of shapes and polishing before having the conrods heat treated. This strategy produces a hard bigend bore and tensile strength for all other faces as all carbon loaded oversize material was machined off . So no need to protect most of any component just for carbonizing small areas that are going to have bearing hardness. After heat treatment I did final polishing and having big end bearing sizes ground and lapped on the lathe. There are not a lot of places in engines where utmost precision is required but I am very attentive to bigend finish and clearances, so all diameters are diamond-lapped. Vic Lapping a Horex conrod for crowded needle bearing with cast iron plus diamond paste: [ATTACH type="full"]59722[/ATTACH] [ATTACH type="full"]59723[/ATTACH] Lapped HRD conrods: [ATTACH type="full"]59724[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
oil holes in Crank pin?
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