Abstract: Apparatus as described for centering a collet chuck relative to the longitudinal axis of a dop arm for a gem faceting machine. The apparatus includes a socket mounted to the dop arm and a plug slidably received within an open longitudinal bore formed within the socket. The plug mounts a collet chuck. Two longitudinally spaced sets of screws extend radially into the socket. The individual screws of the two sets can be turned against the plug to adjust the collet chuck into a secure precise coaxial relation with the dop arm axis.

Abstract: A tool fastening system for woodworking machines or the like wherein the tools or tool collars carry radially directed means for releasably securing the tools or collars to a drive shaft or axle in such a manner that the tools or collars may be positioned at any axial position along the axle regardless of the width of the tool or collar and without the use of spacers.

Abstract: Disclosed is an electric tool particularly adapted for the grinding and refinishing of different sized and shaped faucet seats. The tool comprises an electric motor having a rotary output shaft, an adapter in the form of a double-ended chuck one end of which is sized to receive the rotary output shaft of the electric motor, and a plurality of mandrels each one of which comprises a stem sized to be received in the other end of the adapter and a working shaft sized and shaped to receive different sizes and/or shaped faucet seats. The electric motor may be either hand-held or bench mounted.

Abstract: An adjustable length rotary cutting tool extension for a numerical controd machine to adjust the length of a resharpened or shorter tool to match the preestablished length set into the numerical controlled data program.

Abstract: A holder for tightly gripping the shank of an elongate cutting or like tool comprises a shank portion and a base portion with a cylindrical outer surface. The holder has a central bore for receiving the tool shank and transverse screws intersecting the bore for tightening against the tool shank. A ring encircles the cylindrical portion of the base member and under stresses caused by tightening the screws against the tool shank, the ring and base portion deform between conditions in which the ring is rotatable on the base portion and non-rotatable on the base portion. The rotatable or non-rotatable condition of the ring indicates the tightness of the screws.

Abstract: A rotatable mandrel is provided for stippling various surfaces, including the surface of plastic material, and is disclosed as comprising a cluster of burrs symmetrically arranged about the axis of rotation of the mandrel.

Abstract: A clamp arrangement for clamping saw blades to the blade holder of a power driven saw includes a seating surface formed on the end portion of a blade holder of the power driven saw for receiving the saw blade thereon. A collar surrounds the end portion of the blade holder and the shank portion of the saw blade. A threaded annular member threadably engages the collar and presses the saw blade against the seating surface and the end portion of the blade holder is, in turn, pressed against the inside wall surface of the collar. A clear passage through the annular member facilitates access to the shank portion of the saw blade held between the annular member and the seating surface whereby the shank portion can be easily removed from between the annular member and the receiving surface with the aid of an instrument passed through the clear passage in the event the blade should break off at the shank.

Abstract: An adjustable head arrangement for the shank of a boring bar is disclosed having an easily replaceable tool unit and also having an axially adjustable abutment means on the tool unit so that the cutting point of the tool unit is firmly supported and held during cutting operations but is adjustable with respect to the shank of the boring bar in between different cutting operations.

Abstract: A cutting tool having one portion including a cutting head and another portion including a stem, the portions being separately produced from the same or different metals, or nonmetals, ceramics and the like, and then connected together in coaxial relation by a slip, press, or shrink fit of a polygonal shank of uniform cross section throughout its length on either one of said portions into a complementary polygonal socket in the other portion. Novel means are provided for adjustment of the portions generally radially of the cutting axis to offset differences in concentricity due to manufacturing errors and to assure firm and precise coaxial relation of the assembled portions.