Drill with replaceable cutting inserts

Details Drill with replaceable cutting inserts Drill with replaceable cutting inserts

1990-12-10

1992-03-03

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool-support with means to permit positioning of the tool...

Pivotable tool

407113, 408229, 408713, B23B 5102

Patent

active

050927183

ABSTRACT:
A metal cutting drill with two replaceable cutting inserts which are positioned to cut the full circumference of a hole during each one-half revolution of the drill. Each insert is triangular and includes an active cutting edge having a curved corner to enable the insert to cut near the center of the hole. Each insert may be inverted and indexed in order to bring an alternately usable cutting edge into active cutting position. By virtue of the inserts being triangular, the curved corners on the cutting edges of the two inserts may be positioned relatively close together and yet sufficient space is left between the inserts to enable the drill body to be relatively thick and strong.

REFERENCES:
patent: 4340327 (1982-07-01), Martins
patent: 4373839 (1983-02-01), Negishi et al.
patent: 4687388 (1987-08-01), Yokota et al.

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