A machining center for machining a center groove on a pulley and a flange formed at opposite ends of a crankshaft of a vehicle includes a measurement unit configured to measure a moment of the crankshaft when the crankshaft is loaded and actuated, a control unit configured to calculate an imbalance amount of the crankshaft and to derive center drill coordinates for removing the imbalance amount, a compensation unit mounted in a base frame and configured to compensate a position of the crankshaft by rotating first and second rotating elements based on the center drill coordinates inputted from the control unit when the crankshaft is transported and clamped by a clamping system, and a machining unit configured to machine the center groove in the pulley and the flange of the crankshaft.

A machine tool includes: a tool holder which includes a key groove; a spindle drive unit which includes a spindle key that can be fitted into the key groove of the tool holder and a spindle and which removably holds the tool holder; a tool exchanger which includes a grip key and a grip that holds the tool holder at a fixed position with respect to the spindle; and a numerical controller which controls the tool exchanger so as to fit and remove the tool holder with respect to the spindle, and the numerical controller controls the spindle drive unit such that when the tool holder is fitted to the spindle, in a state where the key groove of the tool holder is inserted in the spindle key, the spindle is rotated to press the spindle key to the key groove so as to determine the phase of the tool holder with respect to the spindle.

A hand-held tool system comprises a hand-held tool and a positioning device matching the hand-held tool. The hand-held tool comprises an output shaft and a working head coupled to the output shaft. The positioning device comprises a detecting module configured to detect a positional feature and/or a movement feature of the positioning device and output a parameter indicative of the positional feature and/or the movement feature, the detecting module and the working head having a preset distance therebetween; a storage module configured at least to record reference position information about the working head; a control module configured to acquire real-time position information about the working head based on the parameter, the preset distance and the reference position information; and an output module configured to output the real-time position information in a way that can be perceived.

A hand-held tool system comprises a hand-held tool and a positioning device matching the hand-held tool. The hand-held tool comprises an output shaft and a working head coupled to the output shaft. The positioning device comprises a detecting module configured to detect a positional feature and/or a movement feature of the positioning device and output a parameter indicative of the positional feature and/or the movement feature, the detecting module and the working head having a preset distance therebetween; a storage module configured at least to record reference position information about the working head; a control module configured to acquire real-time position information about the working head based on the parameter, the preset distance and the reference position information; and an output module configured to output the real-time position information in a way that can be perceived.

Locating apparatus for machine tool including supporting portion for placing at fixed point on object's machining surface, detector including cable to connect apparatus with machine, and locating portion to release or receive cable to measure distance between machine and apparatus and including frame, first device, second device and third device. First device attached to the frame and for receiving or releasing cable in opposition to or pushed by elastic element. Second device attached to frame and includes transmission member to allow the cable passage. Third device attached to frame and allows cable release or reception by apparatus towards machine. First device includes discoidal element rotating around axis of rotation respective to frame to wind or release cable on winding surface. Second device includes guiding slider for conveying cable along conveying direction and moving along translation direction parallel to axis of rotation in proportion to discoidal element rotation.

Locating apparatus for machine tool including supporting portion for placing at fixed point on object's machining surface, detector including cable to connect apparatus with machine, and locating portion to release or receive cable to measure distance between machine and apparatus and including frame, first device, second device and third device. First device attached to the frame and for receiving or releasing cable in opposition to or pushed by elastic element. Second device attached to frame and includes transmission member to allow the cable passage. Third device attached to frame and allows cable release or reception by apparatus towards machine. First device includes discoidal element rotating around axis of rotation respective to frame to wind or release cable on winding surface. Second device includes guiding slider for conveying cable along conveying direction and moving along translation direction parallel to axis of rotation in proportion to discoidal element rotation.

A method of monitoring a tool clamping device mounted on a machine spindle, the clamping force of which tool clamping device is generated by a spring assembly which exerts a force in the direction of the clamping position on an actuating element actuating the clamping or the release of a tool or tool holder. In the method, the spring force and the displacement of the actuating element are continuously measured during the release and/or clamping of a tool or tool holder and recorded as functions of the time. These recorded functions are used to identify at least one parameter characteristic for the status of the tool clamping device. Based on the spring force and the displacement over time, a spring characteristic curve is plotted in the form of the spring force as a function of displacement, the analysis of which spring characteristic curve provides information about a number of characteristic parameters.

A two degree-of-freedom nano positioning stage with a parallel flexure hinge mechanism includes two driving systems respectively arranged along an X axis and a Y axis, a moving stage, a parallel flexure hinge mechanism and a base frame, wherein each of the driving systems includes a piezo actuator, a connecting block, a lever, a preloading spring, a push rod and a plurality of connecting hinges; the piezo actuator is fixed on the base frame at one end and connected with the connecting block at the other end; the lever is connected between the connecting block and the preloading spring, the connecting block is connected with the lever through one of the connecting hinges; the preloading spring is fixed on the base frame at one end and connected with the lever at the other end, and the lever is connected with the base frame through another one of the connecting hinges.

A two degree-of-freedom nano positioning stage with a parallel flexure hinge mechanism includes two driving systems respectively arranged along an X axis and a Y axis, a moving stage, a parallel flexure hinge mechanism and a base frame, wherein each of the driving systems includes a piezo actuator, a connecting block, a lever, a preloading spring, a push rod and a plurality of connecting hinges; the piezo actuator is fixed on the base frame at one end and connected with the connecting block at the other end; the lever is connected between the connecting block and the preloading spring, the connecting block is connected with the lever through one of the connecting hinges; the preloading spring is fixed on the base frame at one end and connected with the lever at the other end, and the lever is connected with the base frame through another one of the connecting hinges.

A handle is coupled to an industrial machine tool, along with a method of operating the industrial machine tool via the handle. The handle comprises a housing, a first switch, and a second switch. The housing includes a first side, a second side, a top end, and a bottom end, the first side facing toward the industrial machine tool and the second side facing away from the industrial machine tool. The first switch actuates a float mode for the industrial machine tool, the float mode being a mode in which movement of a moveable portion of the industrial machine tool is power assisted for an operator of the industrial machine tool. The second switch actuates a machining portion, coupled to the moveable portion of the industrial machine tool, to perform a machining process on a workpiece.