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首页> 美国政府科技报告 >Prototype Gauge for Measuring Contour and Wall Thicknesses of Hemispherical Parts.
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Prototype Gauge for Measuring Contour and Wall Thicknesses of Hemispherical Parts.

机译：用于测量半球形零件的轮廓和壁厚的原型仪。

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A prototype gauge (gage) was designed and fabricated using air bearings in a new configuration to provide less error and distortion during inspection of hemispherical parts. No wear occurs on the moving parts during operations and accuracy of alignment is maintained. The gauge will check outside radial distance,inside radial,and outside radial and wall,and inner radial and wall thicknesses of parts. The gauge contains only four moving parts,which increases the measuring accuracy. A horizontal table rotates. A table mounted on the horizontal table at 45exp 0rotates through two transducers. All moving parts are mounted on hydrostatic gas bearings. Laser interferometric,air-bearing gauge heads are used to obtain the required data. Investigation of a hemispherical part is in any desired spiral path from equator to pole. Measurement information is obtained from two laser interferometric transducers using linear air bearings. The transducers use a Spectra Physics Model-120helium and neon laser. Working range of each transducer is 1.5inches. The fringe voltage signals are amplified and converted to inches to be displayed on a digital readout. A punched paper tape contains the nominal inside diameter (ID) and outside diameter (OD) information in Binary Coded Decimal form. The tape is fed into a digital computer which calculates error information on ID,OD,and wall thickness. This information is converted to analog form and displayed simultaneously on a strip-chart recorder. (ERA citation 01:014243)

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