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On 12 Jun 99, at 20:04, Per Lindgren wrote: > Jim Adney wrote: > > > I doubt if the roughness would help cracking, although shot peening > > will. > > Can somebody please explain to me, what is shot peening? I cant say I understand > the term fully. It's like sand blasting, except that you use hard round non-abrasive media instead of sand. It peens the surface and puts it in a state of compressive stress. Under these conditions a crack can't get started. The crack needs a part to be under tension. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org