CUTTING HEAD COMPRISING A DRILL TIP AND A DRILL HAVING SUCH A CUTTING HEAD
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United States of America Patent
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Mar 27, 2012
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Apr 5, 2011
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Abstract
A cutting head includes a drill tip having a chisel edge, at least two main cutting edges, each extending between a central end at the chisel edge and an outer end. A recess is associated with each main cutting edge and located at each side of the chisel edge. Each recess includes a chip breaking groove extending along the main cutting edge and spaced from the main cutting edge by a distance. Furthermore, a twist drill has a cutting head and drill tip.
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