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An end mill adapted to make a full depth cut in a workpiece in a single pass and having the helix pitch angle of the cutting edges from 10°to 30°. In operation tightly curled substantially straight elongated chips substantially as long as the depth of cut in the workpiece are produced. A greatly inc

An end mill adapted to make a full depth cut in a workpiece in a single pass and having the helix pitch angle of the cutting edges from 10°to 30°. In operation tightly curled substantially straight elongated chips substantially as long as the depth of cut in the workpiece are produced. A greatly increased feed rate is attained at greatly reduced rpm, as compared to conventional end mills.

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A method of milling a workpiece with an end mill having an elongate cylindrical shaft provided at an upper end with a shank for chucking the end mill in a milling machine spindle, and equipped with flutes providing helical cutting edges extending from said shank and running out at an opposite lower

A method of milling a workpiece with an end mill having an elongate cylindrical shaft provided at an upper end with a shank for chucking the end mill in a milling machine spindle, and equipped with flutes providing helical cutting edges extending from said shank and running out at an opposite lower end of the shaft, said method comprising: providing said cutting edges with a helix pitch angle of from 10°to 30°and thoughout the length of each of the cutting edges providing a concave rake surface sloping toward said lower end and away from the cutting edge and merging with an upsweep surface leading into an overhang surface; operating said end mill in center thrust cutting relation to the workpiece; and in such operating of the end mill causing said cutting edges and said surfaces to cooperate to cut from the workpiece and form tightly curled substantially straight elongated chips substantially as long as the depth of cut in the workpiece.