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Four Elements for Twist Drill Geometry- printable pdf 

The four principal elements of twist drill geometry decribes the proper centering of the chisel edge of the webi in relation to the outside diameters and flutes on standard twist drills.  The four basic elements for standard drill bits are:  web thickness & concentricity of the twist, the point angle & the point, and the lip relief angle. These elements are what determines the geometry of the standard twist drill bits.  We focus more on the metal working side of drill bits.  

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Four Elements for Twist Drill Geometry- printable pdf