Wall thickness measuring method and apparatus

Details Wall thickness measuring method and apparatus Wall thickness measuring method and apparatus

1987-10-06

1989-01-17

Hix, L. T.

Geometrical instruments

Area integrators

Electrical

356381, A45B 308

Patent

active

047980028

ABSTRACT:
An apparatus for measuring the wall thickness of a nonmagnetic article having a housing supporting a magnet and a contiguous supporting surface. The tubular article and the housing are releasably secured to the supporting surface and a support member of an optical comparator, respectively. To determine the wall thickness of the article at a selected point, a magnetically responsive ball is positioned within the tubular article over said point and retained therein by means of a magnetic field produced by the magnet. Thereafter, an optical comparator is employed to project a magnified image of the ball on a screen and the wall thickness at the selected point is calculated by using a ball surface measurement taken with the comparator in conjunction with a previously determined base line measurement.

REFERENCES:
patent: Re22531 (1944-08-01), Hare
patent: 2346486 (1944-04-01), Hare
patent: 2349429 (1944-05-01), Herzog et al.
patent: 3902811 (1975-09-01), Altman et al.
patent: 4136457 (1979-01-01), Langer
patent: 4220966 (1980-09-01), Montone

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