Patent ID: 7150589

Claim:
A tool for deburring a workpiece comprising: a shaft having a proximal end and a distal end and defining an axis of rotation; a proximal cutter attached to said shaft, said proximal cutter having a proximal end, a distal end and a plurality of flutes, a diameter of said proximal cutter being larger at said proximal end than a diameter of said proximal cutter at said distal end, each said flute including a rake surface having a radially inner end proximate to said shaft, a radially outer end distal to said shaft, a lower end and an upper end, a relief surface having a radially inner end proximate to said shaft, a radially outer end distal to said shaft, a lower end and an upper end, a cutting edge joining said upper ends of said rake and relief surfaces, and an end surface extending between the outer ends of said rake and relief surfaces, the rake surface of each said flute is parallel to the axis of rotation, said end surface being at an oblique angle to the axis of rotation, and the lower ends of the rake and relief surfaces of adjacent flutes merging together; a distal cutter attached to said shaft, said distal cutter having a proximal end, a distal end and a plurality of flutes, a diameter of said distal cutter being larger at said distal end than a diameter said distal cutter at said proximal end, each said flute including a rake surface having a radially inner end proximate to said shaft, a radially outer end distal to said shaft, a lower end and an upper end, a relief surface having a radially inner end proximate to said shaft, a radially outer end distal to said shaft, a lower end and an upper end, a relief surface having a radially inner end proximate to said shaft, a radially outer end distal to said shaft, a lower end and an upper end, a cutting edge joining said upper ends of said rake and relief surfaces, and an end surface extending between the outer ends of said rake and relief surfaces, the rake surface of each said flute is parallel to the axis of rotation, said end surface being at an oblique angle to the axis of rotation, and the lower ends of the rake and relief surfaces of adjacent flutes merging together; and the distal end of said proximal cutter being positioned proximate the proximal end of said distal cutter, and a groove for recieving the workpiece is provided by said proximal and distal cutters.