On Sunday, November 27, 2011 01:01:17 PM andy pugh did opine: > On 27 November 2011 17:39, gene heskett <ghesk...@wdtv.com> wrote: > > These worked fine. I didn't note a method to take up for overall wear > > in the outer band though. Or is the load on the bearing outer races > > such that no brinneling occurs? > > The same design seemed to be considered OK for a supercharger (which > would be running at 100,000 rpm and would be expected to last as long > as an engine) > My first guess was that the ring should be 1mm smaller than the > collective OD of the bearings, and that the flex would take up wear > for some time. > The failure mode that concerns me most is actually fatigue of the > outer ring due to the ocntinued flexing.
at a 1mm undersize, that matches what I am thinking too. It would have to be made not from bearing steel, but a spring steel alloy. This flex has to be allowed for while restraining its rotation somehow. Yes, McCullough sold a boatload of those super chargers, but during the time of their popularity, until the more efficient exhaust driven turbos showed up, their operational lifetime was far less than the engine they were feeding unless it was burning dynamite in a full race build, 5 to 10k miles maximum on a street engine. There was at one point, a quite thriving rebuild industry around them in the early 60's & into the 70's. > Wear of the inner shaft would happen much faster, but those are an > off-the-shelf and cheap part. With, I assume some sort of a 3 piston squeezer to loosen it enough to put the new shaft in. :) I toyed with a 2 gear idea for my teeny little mill and came to the conclusion that what I would gain would be short life of that puny little 200 watt motor on it. So I mounted an HF die grinder off to one side, which works well. Noisy though. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> ...his disciples lead him in; he just does the rest. -- The Who, "Tommy" ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
