On Fri, 2009-11-20 at 16:39 +0000, Andy Pugh wrote: > 2009/11/20 Gene Heskett <[email protected]>: > > > A cube of dry ice sitting on > > it would help, but would raise the available oxygen too. > > I am fairly sure it would displace the oxygen (being heavier) and so > would both cool and reduce oxide formation. > > You might have hit on a cunning plan, and it would look cool too. >
Carbon Dioxide doesn't disassociate easily but will if pushed hard. It cannot be used in heat-treating furnaces for that reason but for cooling/shielding Al machined parts I think it will work just fine. I'm not sure the kinetics of Al oxidation are as aggressive as Gene states but cannot find any evidence to support or disallow such a claim. The oxidation curve, at least at high temps (600 F), is parabolic so it limits fairly quickly. A couple of alternatives for small orifices come to mind. Diesel rebuild shops should always have a supply of used injector nozzles. I understand the newer ones are carbide. IIRC Gene had a tap remover (crude edm) running at one time. That should fab almost any small hole he wants. :-) Small volumes of oil/mist might be available by using model airplane engines as pumps. Just thinking out loud. Usually dangerous. Dave ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
