Eddy current bearing ball flaw detector

Details Eddy current bearing ball flaw detector Eddy current bearing ball flaw detector

1980-12-10

1984-02-07

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324262, G01N 2782, G01R 3300

Patent

active

044306148

ABSTRACT:
Apparatus for detecting surface flaws in generally spherical articles such as bearing balls. A spindle carrying a vacuum chuck at one end for gripping the ball is driven to rotate the ball about a first axis. An eddy current probe mounted for rotation about a second axis generally orthogonal to the first axis is urged against the ball to scan a circular strip for cracks and is rotated about the second axis to vary the location of the strip being scanned along the first axis. The probe output is applied through a bandpass filter to a threshold alarm and to the vertical input of an oscilloscope triggered synchronously with the rotation of the spindle.

REFERENCES:
patent: 2994032 (1961-07-01), Hansen
patent: 3921065 (1975-11-01), Rawling et al.
patent: 4155455 (1979-05-01), Spierer et al.
patent: 4330748 (1982-05-01), Holden

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