Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1996-08-07
1998-06-02
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408230, B23B 5102
Patent
active
057589976
ABSTRACT:
A self-centering indexable drill having cutting inserts disposed such that cutting forces on the inboard and outboard flutes of the drill body are substantially equal while boring a hole, thereby keeping the drill body substantially centered. The drill includes a drill body and a plurality of cutting inserts. The drill body includes a shank portion configured to be received by the spindle of a machine using the drill, a collar, and a fluted portion. The fluted portion of the drill body defines an inboard flute and an outboard flute. At least one cutting insert is releasably secured to each of the inboard and outboard flutes, with an equal number of cutting inserts carried by each. An insert pocket is defined by the drill for closely receiving each cutting insert such that the leading face of the cutting insert is substantially flush with the face of the flute. The cutting inserts are spaced on the inboard and outboard flutes such that as the drill bores a workpiece, the material removed by the cutting inserts on the inboard flute is equal to that removed by the cutting inserts on the outboard flute. The exposed cutting edge of the innermost inboard cutting insert is disposed at a first angle with respect to a line normal to the axis of rotation. Each remaining cutting insert carried by the inboard flute, and each cutting insert carried by the outboard flute is disposed at a second angle with respect to a line normal to the axis of rotation. A drill guide may be provided for assisting in preventing the drill from drifting off-center, especially when the exit surface of the workpiece is not parallel to the entrance surface of the workpiece.
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Greenwell Benjamin D.
Mealey Michael
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