Under most cutting conditions, some of the cut material will attach to the cutting point. This tends to cause the cut to be deeper than the tip of the cutting tool and degrades surface finish. Also, periodically the built up edge will break off and remove some of the cutting tool. Thus, tool life is reduced. Built Up Edge Calculating Speeds and Feeds Cutting speed refers to the speed at which the tool point of the cutter moves with respect to the work measured in feet per minute.
Feed is the rate at which the work moves into the cutter measured in feed per tooth revolution.
Feeds and speeds affect the time to finish a cut, tool life, finish of the machined surface, and power required of the machine. The cutting speed is mostly determined by the material to be cut and the material of the tool. To find the right speed for any task, refer to the Machinery's Handbook or other reference. The feed rate depends on the width and depth of cut, finish desired and many other variables. To calculate the desired feed setting from the feed rate, multiply feed per tooth per revolution by number of teeth and rpm of the spindle.