How thick is the oxide layer? Doesn't it self seal the surface as fast as the oxide layer is formed? I guess that's why deeper cuts work better than skim cuts on aluminum?
A while back I was peck drilling 6061 and came across an article on drilling aluminum. Now I drill up to 4*d at 11 IPM. The only ones I can't drill that fast is smaller holes because I can't go faster than 3000 RPM. Now my chips come out as chips instead of long strings and I drill the holes in a second or two instead of minutes... Aluminum is some funny stuff. John On 25 Mar 2008 at 22:47, Gene Heskett wrote: > The oil not only keeps it from piling up on the > bit, it helps to seal the alu against atmospheric oxygen, so alu oxide > doesn't form near as fast and bits stay sharp many times longer if > they don't have to cut that oxide film everytime a flute comes by. > Alu oxide is the second hardest substance, second only to diamond. > Without that oil, the oxide film re-forms less than .001 seconds > behind the edge of the bits exposing it, alu is a VERY reactive metal. > With the oil wetting everything, the reaction is slowed quite a bit, > not stopped, but slowed. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
