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Thread: Dynamic & Static Resistance of Rollers

  1. #1
    ash_bhatnagar Guest

    Roller

    Can you please advise us on the following?
    1) How to test and measure dynamic and static resistance for roller?
    2) What should be acceptable value of dynamic and static resistance for roller say 6205 bearing

  2. #2
    chafekar - FMC Technologies Inc. Guest

    Roller Resistance

    Mr. Ashwanik,

    The University of Hannover, Germany has a machine to determine the running resistance of an Idler Roll. The university offers its services to Idler manufacturers by charging them some fees.

    This is the only machine that I am aware of, and I would be interested to know if anybody else around the world has a similar kind of machine.

    Chafekar

  3. #3
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

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    First the easy question:

    Melco South Africa build and test idler drag with caveates such as:

    a) load variations
    b) temperature range
    c) test bias
    d) grease types
    e) speed range
    f) accuracy needs
    g) variation between rolls
    h) isolation of seal, bearing and lubricant contributions
    i) guaranteed drag values from above criteria

    Contact them at: www.melco.co.za

    Sandvik (Prok Australia) have a test facility: http://www.materialshandling.sandvik.com/au

    Many academics and mfgs. around the world practice in measuring the idler drag for R&D purposes and to undestand the competition.

    There are many test methods and noticable limitations on results. Some simple static and dynamics resistance procedures practiced are:

    Static:

    1. support idler on simple shaft rest and wrap string around shell center, add weights till breakaway - read weight and calc.

    2. grab shell and read torque measurement on free shaft similar to point 1.

    Dynamic:

    3. grab shaft as in point 1, in a lathe and add rotating load with roller with pressure control onto shell while reading shaft torque resistance

    There is a long list of the types and their biases. I would believe Bulk Solids library has some good input.

    Lawrence Nordell
    Conveyor Dynamics, Inc.

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