This paper, describes an eddy current system developed to detect cracks, splits, and folds in 5.56 mm cartridge cases at a rate of 1200 cases/minute. The system inspects each cartridge case around its entire circumference, and has an operating frequency of 100 kHz which minimizes sensitivity to wall thickness variations. Also discussed in this paper is the use of this instrument to monitor cartridge case wall thickness by reducing the operating frequency. At a frequency of 25 kHz, wall thickness can be measured with an accuracy of 0.013 mm (0.0005 in.). Maximum, minimum, and average wall thickness are simultaneously recorded for each case about its circumference at four different locations on the case.


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    Title :

    An eddy current system for high-speed inspection of M-16 cartridge cases


    Additional title:

    Ein Wirbelstromsystem zum schnellen Pruefen von M-16-Geschosshuelsen


    Contributors:
    Dilbeck, R.A. (author) / Davis, T.J. (author)

    Published in:

    Materials Evaluation ; 39 , 4 ; 396-400


    Publication date :

    1981


    Size :

    5 Seiten, 11 Bilder


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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