A device for keyway broaching is provided with a housing, a drive shaft, a broaching carriage received and supported in the housing, a tool support connected to the broaching carriage, and a crank drive that couples the drive shaft and the broaching carriage with each other. The broaching carriage, when driven by the drive shaft, performs an oscillating movement comprising a cutting movement and a return stroke. A sleeve is arranged between the housing and the broaching carriage. A first seal is provided between the housing and the sleeve and/or between the sleeve and the broaching carriage. The tool support is connected to the broaching carriage with a rocking lever interposed between the tool support and the broaching carriage. The drive shaft has a control section that controls a relative movement between the rocking lever and the broaching carriage.

A device for keyway broaching is provided with a housing, a drive shaft, a broaching carriage received and supported in the housing, a tool support connected to the broaching carriage, and a crank drive that couples the drive shaft and the broaching carriage with each other. The broaching carriage, when driven by the drive shaft, performs an oscillating movement comprising a cutting movement and a return stroke. A sleeve is arranged between the housing and the broaching carriage. A first seal is provided between the housing and the sleeve and/or between the sleeve and the broaching carriage. The tool support is connected to the broaching carriage with a rocking lever interposed between the tool support and the broaching carriage. The drive shaft has a control section that controls a relative movement between the rocking lever and the broaching carriage.

A power tool includes a motor including a rotor and multi-phase stator windings; a driver circuit having multiple switch elements for outputting switch signals to drive the motor to rotate; and a controller electrically connected to at least the driver circuit and the motor. The controller is configured to acquire rotor position information of the motor and adjust a resultant magnetic potential of the motor according to the rotor position information such that an output electrical parameter of the motor corresponding to the resultant magnetic potential is within a preset parameter range.

A power tool includes a motor including a rotor and multi-phase stator windings; a driver circuit having multiple switch elements for outputting switch signals to drive the motor to rotate; and a controller electrically connected to at least the driver circuit and the motor. The controller is configured to acquire rotor position information of the motor and adjust a resultant magnetic potential of the motor according to the rotor position information such that an output electrical parameter of the motor corresponding to the resultant magnetic potential is within a preset parameter range.

A machine tool includes: a frame; a hollow ram disposed on the frame in a reciprocable manner; a hollow spindle to which a tool is mountable, rotatably supported by the ram, and having a lever hole penetrating the spindle in a radial direction and extending in an axial direction; a drawbar including a collet, reciprocate in the spindle, and urged toward a basal end of the spindle; a lever connected to the drawbar and extending radially outward of the spindle through the lever hole; a trigger fixed to the frame; a feed unit that reciprocates the ram, advances the ram toward a distal end to machine a workpiece, and retracts the ram toward a basal end to bring the lever into contact with the trigger for the drawbar to advance with respect to the spindle to open the collet.

A machine tool includes: a frame; a hollow ram disposed on the frame in a reciprocable manner; a hollow spindle to which a tool is mountable, rotatably supported by the ram, and having a lever hole penetrating the spindle in a radial direction and extending in an axial direction; a drawbar including a collet, reciprocate in the spindle, and urged toward a basal end of the spindle; a lever connected to the drawbar and extending radially outward of the spindle through the lever hole; a trigger fixed to the frame; a feed unit that reciprocates the ram, advances the ram toward a distal end to machine a workpiece, and retracts the ram toward a basal end to bring the lever into contact with the trigger for the drawbar to advance with respect to the spindle to open the collet.

A machine tool, includes: a frame; a hollow ram disposed on the frame in a reciprocable manner; a hollow spindle rotatably supported by the ram, the spindle including a spindle hole located at a distal end, and a spline hole located at a basal end; a guide block disposed in the spindle and having a guide hole extending along a center axis of the spindle; and a spindle drive shaft rotatably supported by the frame, the spindle drive shaft including a spline shaft that engages with the spline hole, and a support shaft disposed at a distal end of the spline shaft to be guided in sliding contact with the guide hole.

A machining device (1) comprising a housing (2), a spindle (4) comprising at least one bearing, a pulse shaft (11), an amplitude disc (8) coupled to the pulse shaft (11) and arranged concentric to it, the pulse shaft (11) defining an axial direction (AD), the amplitude disc (8) further comprising at least one recess (20), in which a sled (24) is arranged. The sled (24) has an irregularity (28), which comprises a concave part as seen in a plane defined by the amplitude disc (8). The machining device (1) further comprising at least one first elastic element (12a), a first motion link (14a) and a first embedding disc (10a) comprising at least one contact element (26), the first embedding disc (10a) being arranged concentric to the amplitude disc (8) and the spindle (4) being coupled to the first embedding disc (10a), the first motion link (14a) being connected to the housing (2) and the first embedding disc (10a). The at least one first elastic element (12a) abutting the housing (2) with one end and the first embedding disc (10a) and/or the first motion link (14a) with the other end for pre-tensioning the first embedding disc (10a) towards the amplitude disc (8), whereby the contact element (26) of the first embedding disc (10a) is abutting the amplitude disc (8) and the irregularity (28) at least once per turn when the machining device is in use, so that a relative rotation between the amplitude disc (8) and the first embedding disc (10a) results in vibration in the spindle (4).

A machining device (1) comprising a housing (2), a spindle (4) comprising at least one bearing, a pulse shaft (11), an amplitude disc (8) coupled to the pulse shaft (11) and arranged concentric to it, the pulse shaft (11) defining an axial direction (AD), the amplitude disc (8) further comprising at least one recess (20), in which a sled (24) is arranged. The sled (24) has an irregularity (28), which comprises a concave part as seen in a plane defined by the amplitude disc (8). The machining device (1) further comprising at least one first elastic element (12a), a first motion link (14a) and a first embedding disc (10a) comprising at least one contact element (26), the first embedding disc (10a) being arranged concentric to the amplitude disc (8) and the spindle (4) being coupled to the first embedding disc (10a), the first motion link (14a) being connected to the housing (2) and the first embedding disc (10a). The at least one first elastic element (12a) abutting the housing (2) with one end and the first embedding disc (10a) and/or the first motion link (14a) with the other end for pre-tensioning the first embedding disc (10a) towards the amplitude disc (8), whereby the contact element (26) of the first embedding disc (10a) is abutting the amplitude disc (8) and the irregularity (28) at least once per turn when the machining device is in use, so that a relative rotation between the amplitude disc (8) and the first embedding disc (10a) results in vibration in the spindle (4).