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    A New Look at an Old Idea: The Torque Curve Revisited

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    Current lubricant testing methods for the pin and vee block machine produce only two data points, the torque at the final failure load, and the final failure load. Lubricant designers have had trouble correlating these single point data with field results. To obtain correlation of bench testing with field performance, it is imperative to examine all of the data produced during the course of the Extreme Pressure test, and appropriate plots of the data. An improved correlation of the laboratory test to industrial machinery performance has been found when plots of torque versus load are compared for lubricants under development. There are certain features in the torque versus load curve which can provide additional information and further improve correlation of bench test results to field data. An example metalworking process will be described.


    pin and vee block, lubrication, extreme pressure, testing

    Author Information:

    Helmetag, KM
    Chemist, Houghton International, Valley Forge, PA

    Committee/Subcommittee: D02.L0

    DOI: 10.1520/STP10513S