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On 23 Nov 2003 at 16:49, Dave Hall wrote: > On the needle-bearing saga, one of our club members was telling me just today > that he made up a new 'bearing' with a sleeve of DEVA metal. It's been fine for > the past 3 years anyway. He's sending a drawing and other info, but I gather > it's an aerospace material so may not be readily available over the counter. I just Googled on <deva bearing> and came up with the fact that it is a product of Federal-Mogul DEVA GMBH. It looks like a pretty good product, but I didn't get into it very far. The hard part is likely to be that they probably have pretty tight requirements for the journal surface. The torsion arm might be welded up and refinished to a smooth surfact, but then it might have to be heat treated and hardened. The photos show some strips which might be bendable into rings for bearings of arbitrary diameter. I'm not sure, but if this is the case it would be good for us. They may have hardness and smoothness specs somewhere, but I didn't find them. In general, it's much harder to make a good bearing for reciprocating motion than for continuous motion. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org