Abstract:
The invention provides a circularity and cylindrical shape measuring device that can decrease the measurement errors generated due to the weight of a measured workpiece. A circularity and cylindrical shape measuring device (10) is configured such that a rotation axis of a rotary table (30) is positioned on a leg (21) that supports a base table (20) or is positioned on a straight line that connects adjacent legs (21A and 21B)
Abstract:
A brake drum caliper is disclosed having a beam and two jaws for measuring the inside diameter of a cylinder, with the improvement of limit stops on each jaw for accurately measuring diameter of the cylinder in at least two depths from the top of the cylinder.
Abstract:
An adjustable gage comprises a centerline hub and a swing gage. The hub includes a body with position jaws adjustably attached thereto, and a central post. The gage comprises a pair of parallel slide bars and front and rear blocks slidable along the slide bars. A movable, spring-biased probe is slidably connected to the front block via a rail and carriage bearing apparatus. The probe is operably connected to a probe-movement indicator. The rear block has a fixed probe. Both probes have end roller bearings. In use, the part to be measured is placed within the position jaws, previously adjusted to the approximate inner or outer diameter of the part. Then, the gage is placed over the post, with the roller bearings coming into contact with the part, and the gage is rotated. The probes track along the part, with any variances in part diameter showing up on the indicator.
Abstract:
An air bearing drive system has a base, a moving portion, an air bearing for forming an air film gap between the base and the moving portion, air nozzles and a suction inlet. The air nozzles and suction inlet are formed on the base. The air nozzles blow air toward the moving portion so as to exert a levitation force on the moving portion. The suction inlet applies suction to the air film gap so as to attract the moving portion toward the base and thereby exert an attraction force on the moving portion. An air supplying device supplies air to the air nozzles. A vacuum source applies suction to the suction inlets. Two adjusting devices are adapted to adjust the levitation force produced by the air issuing from the air nozzles and the attraction force of air drawn into the suction inlet so as to provide an accurate and low cost air bearing drive system.
Abstract:
The peripheral surface shape measuring apparatus can simply and accurately measure a peripheral surface shape of a roll-like object. The peripheral surface shape of a roll-like object is measured by moving a displacement amount measuring device which pinches a diameter direction of the roll-like object with a sensor part and a reference point part arranged opposite to each other in the diameter direction of the roll-like object, from one end side to the other end side in an axial direction of the roll-like object by using a moving device.
Abstract:
An object is mounted and rotated on a rotary table. An encoder outputs a rotary angle signal corresponding to the rotary angle of the rotary table. A detection head outputs a displacement detection signal while tracing the surface of the object. The detection head moves within a plane including the axis of rotation, so as to oppose the outer or inner surface of the object. When the detection head is opposed to the inner surface of the object, the positive and negative signs of the displacement detection signal is reversed, while at the same time a 180.degree. angle is added to the rotary angle signal. By utilizing the reversed displacement detection signal and the corrected angle correction signal, the obtained result can be displayed through a displaying processing common to the processing for the outer surface.
Abstract:
A centering system in a roundness measuring instrument comprises a computing section, a detecting device and a programming device. The computing section seeks an average circle of an article to be measured, a value of eccentricity and a direction of an angle of eccentricity in response to a displacement signal of a forward end element, sets an output signal of a detector so that the position of the detector at the time the measurement element is present on the arc of the average circle becomes zero, and further, calculates only a displacement value of the measurement element in a direction of an X-axis or a Y-axis to the value of eccentricity. The detecting device detects an angle of rotation of an X-Y table in a direction of an angle of eccentricity of the X-axis or the Y-axis. Then, the X-Y table is moved in the direction of each of the X and Y-axis so that the value of eccentricity in the direction of each axis at the time the respective axis is rotated to reach a predetermined angle of rotation becomes zero, thus carrying out the centering. With this operation, the centering work is facilitated and even an unskilled operator can carry out the centering of the article to be measured in a short period of time.
Abstract:
An object is positioned in fixed relation to a measuring axis without regard to centering the object on the axis and at least one series of data samples correlated to the distance between the measuring axis and a series of points located at angularly spaced intervals on at least one surface feature of the object are generated and stored. To determine the center of a first surface feature, the corresponding series of samples is analyzed to identify samples therein corresponding to points lying on a maximum inscribed circle whose center corresponds to that of the surface feature. To measure a second surface feature of an object with reference to the center of a first surface feature thereof, a first signal and a second signal correlated to the distance between the measuring axis and points on the first surface feature and second surface feature, respectively are generated. The center of the first surface feature is then determined to define a vector indicating the positional offset between the measuring axis and that center. The second signal is then adjusted in accordance with that vector to provide a coordinate-corrected signal to be used as a basis for a centered measurement.
Abstract:
The apparatus comprises a bifurcated head rotatably mounted upon a spring loaded arm. The head has two edge plates which can be brought into tangential contact with the periphery of a rotating object. When the head is brought into contact with objects of different diameters, the points of contact with the edge plates progress along location locus lines which, when produced, intersect an an apex. A displacement transducer mounted upon the head has a spring loaded plunger with a probe which is contacted to and detects inaccuracies upon the periphery of the object. In order to accommodate test objects of different diameters, the displacement transducer is bodily movable along an axis of adjustment relative to the head. The point of contact between the probe and test object will, between objects of different diameter, progress along a straight measurement locus line parallel to or coincident with the axis of adjustment. This measurement locus line passes through the apex but does not bisect the included angle between the location locus lines. This arrangement is mechanically simple yet gives unequal angular spacings between the points of contact which do not depend on the diameter of the test object. This facilitates the application of accurate harmonic (Fourier) reconstruction of the roundness profile of the test object. No precision turntable or spindle is required and the method is therefore suitable for in situ measurement. The diameter of the test object need not be known.
Abstract:
A rotundity gage for measuring the roundness of a wheel tread of a railway wheel. The gage includes a measuring device and is adjustable so as to be capable of measuring different size wheels.