Allied Machine & Engineering Corporation

Timothy G Stokey

Joseph P Nuzzi

Wendell E Mast

Robert E McKinley

Greg Fiegl

William H Stokey

A spade drill insert and drilling tool assembly is provided wherein the lands of the spade drill insert have helical margins which provide increased stability during cutting operations. The margin may have a helical trailing side or leading side, a parallel helical margin, or may also include a gullet or flute adjacent the helical margin.

Spade drill insert having helical margins

The present invention relates to a spot and chamfer drill insert which can be utilized to create accurately located spots for subsequent drilling operations while simultaneously providing a chamfer for the finished hole. The present invention utilizes web thin clearance surfaces that are formed at web thin clearance angles, wherein the web thin clearance angles are oriented with respect to a projected plane normal to a plane through the web thin cutting edge and parallel to the longitudinal axis of the insert, wherein the projected plane is tangent to the web thin cutting edge.

Spot and chamfer drill insert

The present invention provides a novel drill insert having chipbreakers, or chip splitting grooves formed through the cutting surfaces. The cutting tool insert has a specialized geometry including a chip splitting groove formed at a negative rake angle. The chip splitting grooves increase the cutting efficiency of the tool while allowing the edge strength to be increased while also allowing higher feed rates.

Drill insert geometry having chip splitting groove

The present invention provides a new cutting tool assembly comprising a replaceable cutting head and a tool body having a common longitudinal axis and mating peripheral surfaces. The cutting head has a cutting portion forming a leading end, a pilot portion forming a trailing end, and a cutting head mounting portion adjacent the trailing end of the cutting head. The tool body has a cutting head receiving portion formed at a leading end of the tool body and a pilot recess disposed in the leading end of the tool body to matingly receive the pilot portion of the cutting head. The cutting head mounting portion and the cutting head receiving portion of the tool body each have at least two coupling portions. The cutting head coupling portions and the tool body coupling portions are bound by their peripheral surfaces and generally mate in shape and dimensions. Each coupling portion has a pair of base surfaces, including upper and lower surfaces. The base surfaces extend transversely to the longitudinal axis and provide support of the cutting head in the tool body. A torque transmission wall extends between the upper and lower base surfaces from the pilot portion surface in a generally transverse direction relative to the longitudinal axis and oriented transversely to the base surfaces. A fastener may be disposed in the tool body along its longitudinal axis where it matingly engages the pilot portion of the cutting head and exerts an axial force on the cutting head for pressing the cutting head mounting portion against the cutting head receiving portion of the tool body.

Cutting tool assembly with replaceable cutting head

The present invention is a drilling system for cutting flat bottomed holes in work pieces. The tool has two opposing angled cutting edges extending from a rotational axis, with the inner portions of these cutting edges extending upwardly to create an overlapping web at the center. The overlapping web strengthens the center portion of the cuttings edges of the tool. The angle at which the inner portion of the cutting edge is inclined can be increased to create a center point on the cutting surface of the tool. The center point adds stability to the tool as it rotates along its longitudinal axis. The cutting edge has a rake surface with a positive rake angle that lessens the forces on the insert and also allows for better formation of chips of stock material being removed. Chip breakers can be cut into the cutting edges of the insert, further aiding in the removal of stock material.

Flat bottom tool

The invention is directed at a drill tool assembly including a holder having a shank and head portion and having a axial centerline or rotational axis on which said holder is rotated in use. The head portion includes a holder slot at least over a central portion of the head, with the slot being oriented perpendicularly to the axial centerline of the holder. The holder slot also includes a locating boss extending upwardly from the bottom of the slot, which includes first and second surfaces, with at least one of the surfaces being located in a predetermined position with respect to the axial centerline of the holder, and substantially parallel to this centerline. A drill insert having first and second cutting surfaces is selectively positioned within the holder slot, and includes a locating slot adapted to be positioned in a predetermined orientation relative to the boss provided in the holder slot. Both the position of the boss and corresponding position of the drill insert and locating slot with respect to the boss are controlled by orienting the drill insert in a predetermined manner with respect to the holder to minimize offset errors in these relative positions. In the preferred embodiment, the holder and the locating dowel or boss share a common rotational axis and the drill insert is installed in the holder in a single orientation and configured so that when it is cammed into place by an offset retaining screw, the bit indexes so that the centerline or rotational axis of the bit, locating boss and holder are substantially co-linear.

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Dover, OH, United States of America

Timothy G Stokey