A pipe machining apparatus includes a frame, a tool support mounted on a tool carrier which is mounted on the frame, and a gearing arrangement for rotating the frame, and a motor for rotating the gearing arrangement. The gearing arrangement includes a toothed pinion gear, a toothed backlash adjustment gear which is moveable relative to the pinion gear and being capable of being fixed in position relative to the pinion gear by a locking assembly, and a toothed bull gear affixed to the tool carrier. The teeth of the bull gear are capable of being engaged with the teeth of the pinion gear and with the teeth of the backlash adjustment gear, the bull gear to minimize backlash.

A positioning jig for locating drill holes or other targets in a workpiece on which the positioning jig is positioned. The positioning jig includes a pinion body and a pair of arms extending from the pinion body. The pair of arms are engaged with a pinion in the pinion body to provide a rack and pinion mechanism for centering the positioning jig on a workpiece. A jig body including at least one aperture is connected with the pinion body. The jig body may be translated with respect to the pinion body for locating the at least one aperture at a target point on the workpiece for drilling a hole or marking the workpiece.

A positive feed tool may include a motor, a gear head and a spindle. The gear head may be operably coupled to the motor and may include a drive assembly and a feed assembly. The spindle may be operably coupled to the gear head and may be selectively driven rotationally and fed axially based on operation of the drive assembly and the feed assembly, respectively. The feed assembly may include a feed rate oscillator having a fixed cam and a movable cam operably coupled to each other via a plurality of rolling elements to oscillate between a maximum width and a minimum width of the feed rate oscillator based on a position of the movable cam. The rolling elements alternate between a first state in which at least some of the rolling elements are unloaded and a second state in which all of the rolling elements are loaded.

An apparatus for drilling a manhole includes a drill comprising a first motor and a drill bit. A rail extends longitudinally away from an exterior surface of the manhole. A carriage is movably engaged with the rail and is coupled to the drill. A mounting device supports the rail on an exterior of the manhole. The mounting device comprises features to transfer axial loading on the drill bit to the manhole. A method for drilling an opening in a manhole includes suspending a drill from a rail coupled to an exterior of the manhole. The rail extends laterally outwardly from the manhole. A drill bit forming part of the drill is rotated while moving the drill longitudinally along the rail toward the manhole. Axial reactive force generated by the drill is transferred to the manhole.

A rotating machining device for machining a work piece includes a support housing adapted for mounting on the work piece and a headstock rotatably mounted on the support housing about an axis. The headstock including an internal gear. A drive module is arranged to drive rotation of the headstock about the axis and at least one gear connection is formed between the internal gear and the drive module. The at least one gear connection is positioned radially inside of an outer diameter of the support housing to protect an operator from a pinch point associated with the at least one gear connection.

The present invention provides a new drill chuck that resolves the problem that the excessive clamping force of the existing drill chuck makes it inconvenient to open the drill chuck and easily damages the cutters. The new drill chuck comprises a front-body, an after-body, and clamping jaws, wherein a thread is provided on the clamping jaw, the after-body is provided with master gears, slave gears are provided between the clamping jaws and the after-body, the master gear fits with the slave gear, a thread is provided inside the slave gear, and the thread of the slave gear fits with the thread of the clamping jaw.

A tool turret includes a turret body having at least one connecting slot for replaceably mounting a tool holder to the turret and a transmission shaft arranged at the connecting slot. The transmission shaft is configured to transmit a drive torque to the mounted tool holder, and includes a torque receiving-side section for receiving driving torque and a connecting-side section for connecting to the mounted tool holder. The connecting-side section has a first gearing for transmitting the drive torque to a corresponding tool holder gearing, wherein at the torque receiving-side section a contacting part is provided for receiving the torque of the drive unit. A mating surface is provided at the connecting-side section of the transmission shaft and is arranged to contact a surface of the mounted tool holder for interacting with the tool holder to remove a gap between the first gearing and the corresponding mounted tool holder gearing.

A method for detecting whether a slip clutch release event has taken place in a power tool includes determining a first speed of a gear device by a first sensor, determining a second speed of a motor by a second sensor, and determining a current value by a third sensor. The method further includes determining a state of the power tool by using the first and second speeds and the current value, determining a state of the gear device in dependence on the current value by a control device, ascertaining a state of activity of the slip clutch in dependence on the first and second speeds by the control device, and ascertaining by the control device by a combination of the state of the gear device and the state of activity of the slip clutch whether the slip clutch release event has taken place.

An actuator for use with a power tool is disclosed. The power tool includes a spindle-chuck body defining a tool axis and a collet nut surrounding the tool axis and rotatable about the tool axis. The collet nut is coupled to the spindle-chuck body. The actuator comprises a holder positionable to engage the spindle-chuck body and an actuation assembly including a first member positioned to engage the collet nut when the holder engages the spindle-chuck body and a second member operatively coupled to the first member to rotate the first member about a first axis. The second member is rotatable about a second axis non-parallel to the first axis.

Composite gearwheel for an electropneumatic hammer drill, wherein the composite gearwheel has a basic body, consisting of a first material, and an encircling toothing, and wherein the encircling toothing is formed, along a first circular arc, by a toothed body of the composite gearwheel, and is formed, along the remaining second circular arc, by the basic body itself, wherein the toothed body consists of a second material that is different than the first material.