A roundness measurement device provides a rotation table on a base and measures roundness of a measured object placed on the rotation table while rotating the rotation table, and includes a detecting main body, a detecting device driving mechanism, a stylus, a contact member, and a control device. The detecting device driving mechanism displaces the detecting device main body with respect to the base. The stylus has a base end rotatably supported on the detecting device main body and can change an angle position with respect to the detecting device main body using an external force. The contact member is provided at a position where the stylus comes in contact due to displacement of the detecting device main body by the detecting device driving mechanism. The control device controls driving of the detecting device driving mechanism.

A sensor is placed on a plate lowered into the hollow of the shaft and guided by taut wires between a lower attachment device and an upper motorized winder. The deformations, responsible for measurement errors and caused either by static deformations, produced by the weight or poor construction of the apparatus, or by vibrations, are to a large extent eliminated.

A method of placing a work piece on a measuring device in which a work piece is placed on a table of a measuring device is provided. The method includes: using a retainer capable of holding the work piece above the table and a lifting/lowering device lifting and lowering a top surface of the table; holding the work piece above the table with the retainer; lifting the top surface of the table with the lifting/lowering device to bring the top surface of the table into contact with a bottom surface of the work piece; and, after a load of the work piece is borne by the table, releasing the hold of the retainer on the work piece.

A measurement device can include a plurality of wheel support modules. Each of the wheel support modules can be configured to attach to a different type of vehicle wheel and to provide for rotation of the vehicle wheel about an axis. An arm can be removably attached to the first wheel support module. A measurement element that measures deformation of the vehicle wheel can be moveably attached to the arm. The different configuration of each of the wheel support modules allows for various types of vehicle wheels to be measured for deformation using the same measurement device.

A measurement apparatus includes a horizontal plate. The horizontal plate includes a first plate end, a second plate end disposed away from the first plate end in a longitudinal direction, a first plate surface extending between the first plate end and the second plate end, and a second plate surface extending between the first plate end and the second plate end. The second plate surface is disposed away from the first plate surface in a normal direction. A first support member extends from the first plate end longitudinally toward the second plate end and protrudes in a direction normally away from the second plate surface. A second support member extends from the first plate end longitudinally toward the second plate end and protrudes in a direction normally away from the second plate surface. A measurement bar contacts the first support member and the second support member.

A shaft precision automatic measurement device for motors is provided that is able to automatically measure shaft precision of a motor. A shaft precision automatic measurement device (1) for a motor (9) includes: a gripping mechanism (3) that grips the shaft (7); a first contact-type displacement sensor (41) that is able to measure a position of the flange face (82) by contacting to follow the flange face (82); a second contact-type displacement sensor (42) that is able to measure a position of the fitting face (81) by contacting to follow the fitting face (81); a rotary mechanism (5) that causes the device main body (2) to rotate in a state gripping the shaft (7) by the gripping mechanism (3) and executing measurement by way of the respective displacement sensors; a displacement data acquisition part (63) that acquires displacement data of the flange face (82) and displacement data of the fitting face (81); and a measurement part (64) that measures center runout and face deflection of the shaft (7) based on the respective displacement data acquired by the displacement data acquisition part (63).

A rotary disk rotatable around a vertical rotation axis; a bearing supporting the rotary disk so as to be freely rotatable; a slide disk slidable on a top surface of the rotary disk; a position adjustment bracket that displaces the slide disk along the top surface of the rotary disk; a placement disk that is supported by the slide disk; a plurality of air nozzles that are arranged on a top surface of the stator in an annular shape centered on the rotation axis, and form a static pressure air film between the top surface of the stator and a bottom surface of the rotary disk; an aerostatic pocket formed between the top surface of the rotary disk and a bottom surface of the slide disk; and a communication aperture is formed on the rotary disk and introduces pressure of the static pressure air film into the aerostatic pocket.

The inner surface shape measurement device, which measures an inner surface shape of a small hole formed in a workpiece, includes: a rotating body for rotating the workpiece around a rotation axis, and a linear-and-tilting-motion stage; an elongated probe capable of being inserted into the small hole of the workpiece; a probe linear-and-tilting-motion mechanism capable of adjusting posture of the probe; a camera, configured to be rotatable integrally with the rotating body, for imaging the probe from at least three circumferential positions on a rotation trajectory centered on a rotation axis; and a controller for adjusting the posture of the probe using the probe linear-and-tilting-motion mechanism based on an image taken by the camera at each of the circumferential positions.

The following are observed using a camera: a first position of a small hole of a workpiece, which is fixed to a linear-and-tilting-motion stage and rotating with a rotating body, and a second position thereof different from the first position, at a first rotation angle of the rotating body; and the first position and the second position of the small hole of the workpiece at a second rotation angle different from the first rotation angle of the rotating body. A position and a tilt of the small hole are calculated from coordinates of the respective observed positions, and small hole information, which includes the position and the tilt of the small hole, is outputted.

A radial force device for a contour measuring instrument for measuring a contour of a shaft-shaped workpiece which can be rotated about an axis of rotation. The radial force device has a clamping body, a force introduction roller, at least one counter-roller and a coupling device. The clamping body is shaped for fitting radially around a workpiece portion, received in the contour measuring instrument, of the workpiece. The force introduction roller is designed to apply a mechanical radial force to the workpiece in order to apply a load to the workpiece, wherein the force introduction roller is mounted in a radially movable manner on the clamping body. The counter-roller is mounted in the clamping body and designed to support the workpiece during the application of the force. The coupling device is shaped for coupling the clamping body to the contour measuring instrument.