Abstract:
A roundness measuring device includes: an eccentric position calculation unit calculating, based on a measured distance and a measured angle, a distance between a axis of the measured object and a rotation axis as an eccentric distance, and calculating an angle formed between the detection line and a line segment connecting the rotation axis and the axis of the measured object as an eccentric angle; and a measurement correction unit correcting the measured distance based on the eccentric distance, the eccentric angle, the measured angle, a radius of the measured object, and a length from the center to the surface of the detector unit, and correcting the measured angle by adding a correction angle to the measured angle, the correction angle being formed between the detection line and a line segment connecting the rotation axis and a contact point where the measured object and the detector unit come in contact with one another.
Abstract:
A method of determining geometric parameters of a wafer (16) is disclosed. For this purpose, the wafer (16) is inserted in a wafer holder (30). The wafer holder (30) is equipped with at least three mechanical contacting elements (22). The wafer is in mechanical contact with the contacting elements (22). The contacting elements (22) are distributed on the wafer holder (30) in such a way that they define a geometric figure which is configured such that the center point (40) of the wafer (16) comes to lie within the geometric figure. The position of each contacting element (22) is determined. Each desired geometric parameter of the wafer (16) is then calculated from the position of the contacting elements (22).
Abstract:
The invention is directed to a gauge assembly that is used to measure parameters of camshaft journals or other objects with cylindrical surfaces. The gauge assembly includes two gauges, the first is an air snap gauge and the second a linear variable differential transducer. The air snap gauge is slidingly attached to the base and the second gauge is attached to a base as well. Air resistance measurements, taken through the air snap gauge provide a measure of diameter of the journal while relative linear motion between the base and air snap gauge, measured by the second gauge, provides a measure of journal runout relative to the center axis of the camshaft. Control logic is used to calculate other parameters such as runout of a journal relative to another journal on a common camshaft.
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 method of reducing an n-order component of a radial run out (RRO) of a wheel rim is disclosed, wherein an average Y of RRO Y1 and RRO Y2 of the bead seats is obtained around the wheel rim; the peak-to-peak amplitude X of the n-order component of the average Y is obtained; minimum position(s) at which the n-order component becomes minimum is found to determine deep position(s) P on the wheel rim corresponding to the minimum position(s); a corrective tape having a thickness t of 0.1 to 0.5 mm is applied to the bead seat(s) at each deep position P, wherein the length L of the corrective tape is determined by the following precision expression (1) or alternatively simplified expression (2) L0 = R π × n × arcsin ( X t × a × 1.3 ) ( 1 ) L0 = 100 × R × X 360 × t × a × n where 0
Abstract:
The disclosed tools and method perform measurements of bore parallelism and location in mating machine parts. One of the tools, used to perform measurements on bores in a machine part, includes two platforms separated by risers. The lower of the two platforms has a surface that mimics the mounting surface of a mating machine part. Spindle assemblies mounted on the upper platform are located in precise correspondence with the blue print locations of side-by-side bores in one of the mating machine parts. Each of the spindle assemblies comprises a hollow column receiving a rotatable spindle that carries a dial indicator at its lower end. To perform measurements on the machine part, it is fastened to the underside of the lower platform, and the movable probe of the dial indicator engaging one of the bores, a sweep of the feeler about the bore is performed by turning the spindle. Another tool includes a base with a surface that mimics the mounting flange of a machine part. Carried on the base is a spindle assembly located in precise correspondence with the blue print position of a bore in a mating machine part. With the base of the tool fastened to mounting pad on the mating machine part, the movable probe of a dial indicator fastened to the spindle assembly is swept about a bore in the mating machine part to perform measurements of the location and orientation of the bore.
Abstract:
An apparatus is disclosed for checking the geometric characteristics of mechanical objects having rotational symmetry, such as shafts or bushings. A longitudinal support element defines a longitudinal axis and first reference surfaces, at least one modular coupling element is removably coupled to, and is adjustable longitudinally along, the longitudinal support element and provides second reference surfaces which cooperate with the first reference surfaces to align a linear guide portion transversely of the longitudinal axis. A fastener secures the modular coupling element, which removably supports a gauging device, to the longitudinal support element and a locking/unlocking device cooperates with the gauging device and guide portion for locking the gauging device to the modular coupling element.
Abstract:
An apparatus for inspecting the inner surface (8a) of a hole includes a rotor shaft (12) supported rotatably (14, 16) around its lengthwise axis and movably along the axis and a sensor assembly (7) which is linked by a tilting mechanism (1) with the rotor shaft so that it can be inclined with respect to the axis of the rotor shaft and rotates and moves as the rotor shaft rotates and moves. The sensor assembly selectively assumes the upright position in which its axis coaligns with the lengthwise axis of the rotor shaft, which is necessary for inserting the sensor assembly through a hole (9a) into the hole in the object being inspected, and a titled position in which its axis is inclined with respect to the axis of the rotor shaft, which is necessary for scanning the inner surface (8c) of the hole, by tilting mechanism (1). The rotor shaft is connected to a rotating mechanism (3) and a lifting mechanism (2).
Abstract:
A measurement tool adapted for measuring surfaces of a known desired curvature and specifically grooves, holes, chips, gouges, chafing and/or out of round areas therein. The measurement device is constructed with an attachment member having a curvature matching the "set up" curvature of the part to be measured. The measuring member or probe, is sharpened to permit it to extend through an aperture formed in the attachment member for facilitating its initial setting relative to the attachment member and the surface to be measured. Any movement of the probe during measurement is then a manifestation of a deviation from the original "set up" curvature.
Abstract:
An ovality gauge includes an elongated frame member carrying a roller support arm having a pair of rollers rotatably mounted to the roller support arm and spaced apart from each other. Preferably the rollers are adjustable to various positions. The ovality gauge also includes a moveable contact spaced from the pair of rollers, with the moveable contact and rollers in a plane parallel to the elongated frame member. The moveable contact is connected to an indicator means whereby movement of the moveable contact with respect to the pair of rollers is detected and indicates deviations of a cylindrical member contacting the gauge from perfect roundness.