metaldestroyer
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- Nov 11, 2010
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Hi All; Hoping to get a discussion started regarding the subject line. I have a set of negative rake milling cutters (3/4" shank 1" cutting diameter carbide insert type) I was hoping for improved surface finish and have had some encouraging results. They do behave a lot different than positive rake tooling. 500 SCFM seems to be a good speed with high rates feed like 12" minute they remove a lot of material in a short time but with only fair to poor surface finish. At lower feed rates like 2" minute the surface finish is much improved. Right now it is just a learning experience, and I hope to get other views on this.
Jack
Jack