Drill tool

Details Drill tool Drill tool

1991-01-10

1993-01-05

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With means to apply transient, fluent medium to work or product

Including tool with duct

408224, 408713, B23B 5102

Patent

active

051764776

ABSTRACT:
A drill is provided having a generally cylindrically shaped body. The body has a rear end structured to releasably connect with a torque transmitting machine in a conventional manner. The body has a forward end which is provided with diametrically opposed seats. Each seat releasably retains a cutting insert. Each cutting insert has a cutting edge projecting forwardly from the forward end of the body. Further, the cutting inserts are oriented so that one cutting edge is at a ten degree positive lead angle and the other cutting edge is at a five degree negative lead angle, the angles being measured normal to the center line of the drill. In operation, the drill is used to provide a bore hole in a workpiece, the bore hole having a predetermined perimeter. As the rotating drill contacts the workpiece, the cutting edges contact the workpiece in a predetermined, progressive manner which thereby creates a plurality of spaced apart circular notches of differing depth in the workpiece. The result is controlled, easily managed removal of chips of the material cut from the workpiece.

REFERENCES:
patent: 3963365 (1976-06-01), Shallenberger, Jr.
patent: 4493596 (1985-01-01), Grunsky et al.
patent: 4859123 (1989-08-01), Koesashi et al.

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