Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
2006-11-28
2006-11-28
Banks, Derris H. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C408S227000, C451S048000, C076S108600
Reexamination Certificate
active
07140815
ABSTRACT:
The present invention is directed to a helical drill configuration that allows substantially flat bottomed holes to be machined. At the cutting end of the body member, there are at least two cutting edges that are symmetrically oriented on apposing sides of the rotational axis of the drill. In an embodiment of the invention, first and second cutting edge portions form a continuous surface which provides strength and tool stability. The height of the second portions of each of the cutting edges remains relatively consistent along the horizontal for formation of a generally flat bottom hole. In the embodiment, a center point is defined by two sloped peak surfaces. A central straight chisel edge is formed by the intersection of the two sloped peak surfaces. The first cutting edge section extends from the chisel edge to the second cutting edge section. The first cutting edge section for both cutting edges is formed by symmetrically thinning the two peak surface. In the invention, stress at the center portion of the helical cutting tool is limited by the chisel edge and first sections of the cutting edge near the center portion having a balanced geometry. The balanced geometry of the helical drill also prevents the drill from wobbling and creating deviations in the hole being formed.
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RTW Advertisement, “You Only Get One Shot to Make a Good Impression,” Rogers Tool Works, Inc., Rogers, AR, One Page.
RTW Advertisement, “One Shot Drill Facts,” Rogers Tool Works, Inc., Rogers, AR, One Page.
RTW Advertisement, “New High Performance Drill Provides Elevated Productivity,” reprinted from Metalworking Digest, Oct. 1994, by Rogers Tool Works, Inc., Rogers, AR, One Page.
Ford David L.
George Stephen M.
Moring Raymond E.
Kennametal Inc.
Smith Matthew W.
Williams J
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