Twist drill

Details Twist drill Twist drill

1988-03-14

1991-04-30

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

050113429

ABSTRACT:
A twist drill having a longitudinal axis, a shank portion sized and shaped to be grasped by a twisting tool, and a barrel portion for cutting a workpiece. The barrel portion has a number of flutes formed therein spiraling about the axis and terminating at a point end of the barrel portion. The point end has a number of point surfaces including an inner flank surface, an outer flank surface, a groove surface positioned between the inner and outer flank surfaces and a split surface. The inner flank surface extends from the center of the point end to the inner extent of the groove surface and the outer flank surface extends from the outer diameter of the point end to the outer extent of the groove surface.

REFERENCES:
patent: 1069930 (1913-08-01), Down
patent: 1467491 (1923-09-01), Oliver
patent: 2193186 (1940-03-01), Bannister
patent: 2328629 (1943-09-01), Eich et al.
patent: 2404048 (1946-07-01), Gepfert
patent: 2936658 (1960-05-01), Riley
patent: 2996081 (1960-12-01), Kallio
patent: 3089354 (1963-05-01), Claas et al.
patent: 3125931 (1964-03-01), Stanaback
patent: 3610075 (1971-10-01), Fabish
patent: 3667857 (1972-06-01), Shaner et al.
patent: 3848483 (1974-11-01), Wall et al.
patent: 4209275 (1980-06-01), Kim
patent: 4222690 (1980-09-01), Hosoi
patent: 4381162 (1983-04-01), Hosoi
patent: 4400119 (1983-08-01), Clement
patent: 4456411 (1984-06-01), Clement
patent: 4470733 (1984-09-01), Marques, Jr.
patent: 4594034 (1986-06-01), Maier
patent: 4602900 (1986-07-01), Arpaio, Jr. et al.
patent: 4605347 (1986-08-01), Jodock et al.
patent: 4620822 (1986-11-01), Hague et al.
patent: 4968193 (1990-11-01), Chaconas et al.
Tool and Manufacturing Engineers Handbook, vol. 1, Machining, Society of Manufacturing Engineers, 1983, pp. 9-42.
"Mathematical Model for Multifacet Drills", by Wu and Shen, University of Wisconsin--Madison, Department of Mechanical Engineering, Mar. 1981, revised Jan. 1983.
"Selecting Your Drill Point Geometry", from Cutting Tool Engineering, pp. 16-18, May 1968.
"A New Angle on Drill Points", from American Machinist, p. 55, 1982.
"Drill Grinders Produce `Three Rake`Geometry", from American Machinist, p. 165, Jan. 1982.

Affiliated with

Also associated with

Rating

Twist drill does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Twist drill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Twist drill will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-637282