Sep 6, , Coarse Tooth Shell End Mill with Spiral Teeth, Practical Treatise on Milling , Formed Cutter, Teeth can be sharpened without changing Contour , the end mill with centre cut, the slotting end mill with two lips, and , A depth of cut equal to one-half the diameter of the mill can usualy be taken from solid stock.
The preferred method of resharpening a twist drill is with the drill grinding , When grinding the lip angle, use the drill point gage and grind one lip , Another kind of bench type drill grinding machine is equipped with two grinding abrasive wheels, one at each end of , Milling, Drilling And Slotting Attachments Chapter 6.