dave wrote: > I suspect the only reason to use carbide is that small HSS mills are > really flexible. > Well, it is both a hardness/wear resistance issue and a stiffness issue. I VERY rarely use small HSS tooling for this reason. Our shop at work is guys from the "old school" and almost never use carbide on the mill (use lots of indexable carbide on the lathe). I remember watching them make something for me a while ago with a 1/16" HSS end mill, and I swear the tip of the end mill was tilted 30 degrees from straight. I suggested carbide but they didn't have any, so they had FITS getting that slot to the right dimension. > Even though my mill has serious backlash I can climb mill with small > mills, eg. <= .25". I have had occasional trouble with a .5 rougher but > I had really buried it. I can climb mill with .5 carbide roughers on > steel if I take a light cuts like 50 to 100 thou. > I used to make climb cuts with great trepidation on my manual Bridgeport, as it has .030" blacklash on X and .050"+ on Y. Now, I make practically all cuts in the climb direction except when going back and forth cleaning up the side of some piece.
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