From: Andrew Chuang <email@example.com> Date: 19 Sep 94 01:28:39 References: 1
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Eric Bartsch <firstname.lastname@example.org> wrote: > I have a rather obscure question which hopefully will be read by someone > at P&W or GE. I have been doing research on the growth of cracks in jet > engine roller-bearings and have found that the material used in the older > bearings (AISI 52100 steel) is apparently not currently widely available. > I was wondering if anyone knows a) if there is some hidden source for 52100 > I haven't yet found (I've been searching for about 1.5 months) b) if there > is a different alloy that is now used in its place, or c) the actual > suppliers used for these bearings (i.e. Timken, etc...) Any information anyone > has would be greatly appreciated. I don't know anything about bearing and materials. However, I just read an article in _Flight International_ on the PW4804. (There is a nice cut-away drawing of the engine. Also, last week, there was a drawing of the B777.) The No. 1 bearing balls are made of 52100, while the No. 1 bearing ring as well as other berings are made of M50. > (I realize that this isn't quite on the charter of sci.aeronautics.airliners > but this group seems to have the best odds for being read by someone with > relevant expertise) You may want to try sci.materials.