A work holder includes: a first holding part having three attracting members that are arranged circumferentially apart from each other to attract an axial end face of an annular work; and a second holding part having a contacting member that is held in contact with an inner periphery or outer periphery of the work and restricts radial movement of the work.

A treatment assembly for securing a treatment member to a shaft that includes the treatment member and a female attachment member. The treatment member defines a longitudinal axis, and has a distal end and a proximal end. The proximal end includes an attachment recess defined therein. The female attachment member has a distal end, a proximal end, and a shaft recess defined in the proximal end. The female attachment member is secured in the attachment recess of the treatment member. The shaft recess is defined by an interior surface that includes a first flat surface. The interior surface includes a first detent defined therein. When the shaft is received in the shaft recess, the first flat surface is operatively engaged with a first opposing flat surface on a male attachment member and a first ball is biased into the first detent.

A drilling guard is provided for mounting on a drill head or a drill chuck of a drilling machine, in particular a cordless drill, for protecting the drilling surface against damage during drilling. A method for producing a borehole by using a drilling machine and the drilling guard is also provided.

A fastener driving tool includes a shaft with a working region disposed at a first end of the shaft and configured to drive a fastener, a shank portion disposed proximate a second end of the shaft and configured to couple the shaft to a power tool, and a reduced diameter torsion zone disposed between the shank portion and the working region, the torsion zone extending from a first shoulder closer to the working region to a second shoulder closer to the shank portion. A length (L) and a radius (c) of the torsion zone have been optimized so that approximately half of breakages occur in the working region and approximately half of breakages occur in the torsion zone.

A tool bit coupling assembly includes a coupling rod having an insertion end receiving a coupling device. A slideable sleeve is movable on the insertion end. A receiving hole of the slideable sleeve is larger than the insertion end and includes a coupling section. The insertion end of the coupling rod is received in a rear stop ring including a smaller diameter portion slightly smaller than an inner diameter of the coupling section. The rear stop ring further includes a larger diameter portion slightly larger than the inner diameter of the coupling section. The first coupling section of the slideable sleeve is firstly coupled with the smaller diameter portion of the rear stop ring. When the slideable sleeve is moved toward the driving end of the coupling rod, the coupling section of the slideable sleeve is tightly fit around the larger diameter portion of the rear stop ring.

A magnet sensing portable autonomous device includes a platform. A plurality of wheel sets is coupled to the platform. A drive system is used for driving the plurality of wheels. An attachment mechanism is positioned on an underside of the platform for securing the device to a surface. A control board is used for controlling the operation of the device. In some embodiments, a drill spindle assembly is coupled to the platform. A drill feed assembly is coupled to the drill spindle assembly for raising and lowering the drill spindle assembly. A plurality of sensors are operable to sense one or more magnets disposed below the surface. A drive table is used for positioning the drill spindle assembly in an XY plane based on an output of said plurality of sensors.

A pocket hole jig for locating pocket holes in a workpiece includes a base with a base plate and first and second side walls extending along the base plate, and a body disposed between the first and second side walls and slidable along the base in a forward direction and a rearward direction. The body includes a drill bit aperture angled downward toward the base plate. The pocket hole jig also includes a fastener configured to releasably couple the pocket hole jig to an adjacent second pocket hole jig.

A cutting tool includes a cutting insert mounted to a head attached to a collar at a first end of the cutting tool. A shank is located at a second, opposite end of the cutting tool. A central cavity extends inwardly from the first end toward the shank. An eddy current vibration absorber assembly is disposed within the central cavity. The eddy current vibration absorber assembly includes an absorber mass made of an electrically conductive material, a magnetic material proximate the absorber mass, and a support member for supporting the absorber mass within the central cavity. The eddy current vibration absorber assembly is tuned by selectively adjusting a distance between the absorber mass and the magnetic material.

A cutting tool includes a cutting insert mounted to a head attached to a collar at a first end of the cutting tool. A shank is located at a second, opposite end of the cutting tool. A central cavity extends inwardly from the first end toward the shank. An eddy current vibration absorber assembly is disposed within the central cavity. The eddy current vibration absorber assembly includes an absorber mass made of an electrically conductive material, a magnetic material proximate the absorber mass, and a support member for supporting the absorber mass within the central cavity. The eddy current vibration absorber assembly is tuned by selectively adjusting a distance between the absorber mass and the magnetic material.

Disclosed is a tool system including a drive for driving a tool holder including an electromagnetic generator for generating electrical energy from inertial energy of the tool holder. The tool holder may be driven in rotation, wherein the electromagnetic generator comprises a rotor part, which is rotatably mounted on the tool holder, and a stator part on the tool holder cooperating with each other for generating a voltage by electromagnetic induction. Alternatively, an axially movable inertial mass can be used for utilization of an oscillating linear movement.