Various embodiments of power tool and method of operating same are described. The power tool may include a first position sensor, a second position sensor, a third position sensor, and a controller. The first, second, and third position sensors may each generate a signal indicative of a distance between the respective position sensor and a workpiece. The controller may determine one or more angles of the power tool with respect to the workpiece based on the first, second, and third signal and present an indication as to whether the one or more angles are within a predetermined range. The controller may further obtain a depth measurement based on the first signal, the second signal, and the third signal and generate, based on the obtained depth measurement, one or more control signals that control operation of the power tool.

Various embodiments of power tool and method of operating same are described. The power tool may include a first position sensor, a second position sensor, a third position sensor, and a controller. The first, second, and third position sensors may each generate a signal indicative of a distance between the respective position sensor and a workpiece. The controller may determine one or more angles of the power tool with respect to the workpiece based on the first, second, and third signal and present an indication as to whether the one or more angles are within a predetermined range. The controller may further obtain a depth measurement based on the first signal, the second signal, and the third signal and generate, based on the obtained depth measurement, one or more control signals that control operation of the power tool.

Machining tool comprising a frame in which a drive shaft for a tool is mounted so as to pivot about a rotation axis and to move axially along the rotation axis. The shaft is connected to two rotary motors, namely a first motor connected to a member for meshing with a fluted portion of the shaft in order to drive the shaft in rotation and a second motor connected to a nut engaged with a threaded portion of the shaft in order to move the shaft axially. The motors are connected to at least one control unit designed to control the motors independently of one another, and the first motor and the second motor are coaxial with one another.

Machining tool comprising a frame in which a drive shaft for a tool is mounted so as to pivot about a rotation axis and to move axially along the rotation axis. The shaft is connected to two rotary motors, namely a first motor connected to a member for meshing with a fluted portion of the shaft in order to drive the shaft in rotation and a second motor connected to a nut engaged with a threaded portion of the shaft in order to move the shaft axially. The motors are connected to at least one control unit designed to control the motors independently of one another, and the first motor and the second motor are coaxial with one another.

A power tool includes a control for the motor of the power tool that senses an operating characteristic of the motor and controls the operation of the power tool based on the sensed characteristic. The sensed characteristic includes variations in reluctance of the motor. A controller may sense changes on load on the motor as a result of interaction between a working element such as a saw blade or drill bit and the work piece. The controlled operation may include variation in speed or torque or both, or may include stopping the motor. Emergency conditions may be sensed by changes in reluctance.

A power tool includes a control for the motor of the power tool that senses an operating characteristic of the motor and controls the operation of the power tool based on the sensed characteristic. The sensed characteristic includes variations in reluctance of the motor. A controller may sense changes on load on the motor as a result of interaction between a working element such as a saw blade or drill bit and the work piece. The controlled operation may include variation in speed or torque or both, or may include stopping the motor. Emergency conditions may be sensed by changes in reluctance.

A motor control device that generates, based on acceleration time constant and deceleration time constant, a control signal for a motor driving a drive shaft includes a synchronous operation command extraction unit extracting, from within a machining program, blocks where set-point control is continuously commanded for the drive shafts that synchronize and extracting synchronous operation commands included in the blocks; an operation state computation unit computing, based on acceleration time constant and deceleration time constant, operation time and consumption energy associated with machining performed with the machining program; an optimum parameter computation unit computing, for each synchronous operation command, the acceleration time constant and the deceleration time constant that result in the operation time of the drive shaft being within allowable operation time for operation and the consumption energy being minimum as optimum parameters; and a motor control unit generating the control signal based on the optimum parameters.

A motor control device that generates, based on acceleration time constant and deceleration time constant, a control signal for a motor driving a drive shaft includes a synchronous operation command extraction unit extracting, from within a machining program, blocks where set-point control is continuously commanded for the drive shafts that synchronize and extracting synchronous operation commands included in the blocks; an operation state computation unit computing, based on acceleration time constant and deceleration time constant, operation time and consumption energy associated with machining performed with the machining program; an optimum parameter computation unit computing, for each synchronous operation command, the acceleration time constant and the deceleration time constant that result in the operation time of the drive shaft being within allowable operation time for operation and the consumption energy being minimum as optimum parameters; and a motor control unit generating the control signal based on the optimum parameters.

A workpiece machining method that machines a workpiece surface by moving a rotating tool, which has a cutting blade for interrupted cutting of the workpiece surface, relative to the workpiece comprises: a first process of determining the pattern of arrangement of multiple cavities on the surface of the workpiece formed after cutting by the cutting blade; and a second process of determining the tool path of the rotating tool so that the multiple cavities are disposed on the surface of the workpiece according to the pattern of arrangement determined in the first process.

A method for operating a power tool, wherein the power tool is initially operated with a first combination of operating parameters such that a first working progress is obtained. During operation of the power tool with the first combination of operating parameters, the first working progress can be determined and compared with a second working progress that is obtained when the power tool is operated with a second combination of operating parameters. Depending on the result of the comparison, the power tool can continue to be operated with the second combination of operating parameters or the power tool can return to operation with the first combination of operating parameters. This comparison of the working progresses can be repeated until a maximum, i.e. optimal working progress is reached or found. A power tool, wherein the power tool is preferably in the form of a drill, preferably a core drill.