It is stated that an out-of-round surface having an even number of high-spots requires a checking instrument that has opposed measuring points; and that, if the number of high-spots on the surface is uneven, an instrument having three-point contact, and one of the points of contact located on the center line between the other two, is necessary. Concerning the use of the three-point method, for close work, the angle between the three points of contact must be selected according to the number of high-spots.Divisions of the subject include types of out-of-roundness and those peculiar to certain machines, the three-point measurnig system, errors of the V-block method, use of the V-block for elliptical objects, other methods of checking elliptical forms and indicator-reading correction. Three items for instrument improvement are suggested to manufacturers.


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    Title :

    FACTORS GOVERNING “OUT-OF-ROUNDNESS” MEASUREMENT1


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Pre-1964 SAE Technical Papers ; 1906



    Publication date :

    1923-01-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English


    Keywords :


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