An observation device observes a balance state of a main spindle of a machine tool including the main spindle and a moving body to which the main spindle is rotatably fixed and which moves in a direction orthogonal to the axial direction of the main spindle. The observation device includes a first acquisition unit for acquiring rotation angles of the main spindle during rotation; a second acquisition unit for acquiring movement information indicating a movement state of the moving body when the main spindle is rotating; and an output generation unit for displaying, on a display unit, each of the rotation angles of the main spindle and the movement information in association with each other.

This observation device includes a command output unit that rotates a rotating body and stops a moving body; a first acquisition unit that acquires the rotation angle of the rotating body; a second acquisition unit that acquires the positional deviation of the moving body; and a display control unit that displays, on a display unit, the current rotation angle and a graph showing the correspondence relationship between the rotation angle and the positional deviation, said relationship being corrected on the basis of a first angle difference between a prescribed operation position and an operation position.

This observation device includes a command output unit that rotates a rotation part and stops a moving body; a first acquisition unit that acquires the rotation angle of the rotation part; a second acquisition unit that acquires the positional deviation of the moving body; a correction unit that corrects the rotation angle on the basis of an angle difference; a second storage control unit that establishes a correspondence between the rotation angle and the positional deviation; and a display control unit that displays, on a display unit, a graph indicating the correspondence between the rotation angle and the positional deviation.

A dynamic balancing test and correction apparatus capable of shortening the time required for correcting imbalance in a correction part and improving the entire workflow of the apparatus.

A modular method of balancing a rotor assembly comprising two or more rotor sub-assemblies comprises dynamically balancing a set of rotor units each comprising one of the rotor sub-assemblies (52) and in which every other rotor sub-assembly is substituted by a respective simulator (54A, 56A). A respective set (55X, 55Y, 55Z) of balancing weights is applied to one or more of the rotor sub-assembly and simulators of a rotor unit (50A) to achieve dynamic balancing such that each set only corrects unbalance contributed by that rotor sub-assembly or simulator to which it is applied. Each set which is applied to a simulator is transferred to the corresponding sub-assembly. The sub-assemblies are then mated to form the balanced rotor assembly. Excitation of flexible modes of the balanced rotor assembly during its rotation is reduced or avoided.

A modular method of balancing a rotor assembly comprising two or more rotor sub-assemblies comprises dynamically balancing a set of rotor units each comprising one of the rotor sub-assemblies (52) and in which every other rotor sub-assembly is substituted by a respective simulator (54A, 56A). A respective set (55X, 55Y, 55Z) of balancing weights is applied to one or more of the rotor sub-assembly and simulators of a rotor unit (50A) to achieve dynamic balancing such that each set only corrects unbalance contributed by that rotor sub-assembly or simulator to which it is applied. Each set which is applied to a simulator is transferred to the corresponding sub-assembly. The sub-assemblies are then mated to form the balanced rotor assembly. Excitation of flexible modes of the balanced rotor assembly during its rotation is reduced or avoided.

In a method for identifying an unbalance correction for flexible rotors (1), the rotor (1) is rotatably mounted in two bearing devices. An RPM sensor (4) records the speed of the rotor (1) and a radial movement of the rotor (1) is recorded, by means of position sensors (3) at measuring points (6), during an unbalance measurement run or a plurality of unbalance measurement runs for different rotor speeds. The measured values recorded are fed to an evaluation device (5), which determines the eccentricity measured values assigned to the measuring points (6) by means of expanding the influence coefficient method, and therefore unbalances are determined per plane and eccentricities are determined per measuring point for each measurement run.

The present disclosure is directed toward a method for measuring a true concentricity of a rotating shaft. The method includes simultaneously measuring, with diametrically opposed position sensors, opposite sides of the rotating shaft at an initial state to acquire a first measurement data and at a 180-degree rotation to acquire a second measurement data. The method further determines a rotational centerline and a shaft centerline based on the first and second measurement data, and calculates a concentricity error of the rotating shaft based on the determined rotational centerline and the shaft centerline.

A crankshaft balancer suspension system for measuring an imbalance of a crankshaft. The crankshaft balancer suspension system has a base structure, a measurement bridge structure configured to support the crankshaft during rotation, and a plurality of flexural support legs extending between the base structure and the measurement bridge structure. The plurality of flexural support legs are sized and shaped to permit flexure of the measurement bridge structure relative to the base structure. The crankshaft balancer suspension system further having a drive system having a drive shaft connectable to the crankshaft for rotating the crankshaft and a sensor coupled to the measurement bridge structure for detecting an imbalance in the crankshaft during rotation and outputting imbalance data.

A crankshaft balancer suspension system for measuring an imbalance of a crankshaft. The crankshaft balancer suspension system has a base structure, a measurement bridge structure configured to support the crankshaft during rotation, and a plurality of flexural support legs extending between the base structure and the measurement bridge structure. The plurality of flexural support legs are sized and shaped to permit flexure of the measurement bridge structure relative to the base structure. The crankshaft balancer suspension system further having a drive system having a drive shaft connectable to the crankshaft for rotating the crankshaft and a sensor coupled to the measurement bridge structure for detecting an imbalance in the crankshaft during rotation and outputting imbalance data.