Ball end mill cutting ratesPractical Machinist
May 04 2009 · I also "absolutely" agree with your foreman and also (insist) for the same reason as gbent stated. Plus the cutting edge of a ball end mill has more contact length of flute for the same depth cut PI comes into play. for example if you are cutting .312 deep with a .312 ball end mill there is .408 of flute length cutting instead of .312 that would be with a square E mill.
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Dec 29 2009 · I took a series of machining classes at a community college in CA years ago. The simple guidance given for cutting steel with HSS was 100sfm at the largest diameter. Approximating pi allows the simple formula of 4 x cutting speed (sfm) / diameter (inches). For form cutters like your ball endmill the recommendation was to cut that rpm in half.
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