Improved cutting tool

  • US 5,049,009 A
  • Filed: 08/21/1990
  • Issued: 09/17/1991
  • Est. Priority Date: 08/21/1990
  • Status: Expired due to Term
First Claim
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1. An improved rotary cutting end mill of the type having a shank section, a means for retaining said end mill in a rotary driven apparatus, a fluted portion being an integral extension of said shank section, a terminal end of said end mill at the end opposite the shank, one or more helical teeth formed on the outer surface of said fluted portion, each tooth comprising a cutting surface and peripheral relief wall which intersect to form an angle defining a helical cutting edge, said helical cutting edge defining an outer circumferential cutting path, and said peripheral relief wall having a first and second relief surface wherein the improvement comprises:

  • a first relief surface of said peripheral relief wall having an arcuate land segment and a linear land segment along a substantial portion of said cutting edge, said arcuate land being substantially parallel to said cutting path, located immediately adjacent to said helical cutting edge and terminating at a point along said first relief surface, said linear land segment connecting said arcuate land segment and said second relief surface and defining a surface tapered inward from said cutting path.

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