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Digital Tachometer Questions

Discussion in 'Misc Electronics' started by [email protected], Dec 2, 2005.

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  1. Guest

    I am preparing to do a review of various arcade trackballs and had the
    idea of using a digital tachometer to measure how fast the trackball
    would spin.

    The idea is I can take a power source, like an r/c car's wheel and
    bring the trackball up to a known speed. Then I would take away the
    power source and measure how fast the trackball continued to spin and
    for how long.

    I have a few questions if anyone has used these before.

    1. With a laser and or infared tach, will I need a "dot" or mark on the
    trackball to get a reading?

    2. Does anyone know of a tach that has a PC interface that would allow
    me to create a chart of the speed to time distribution?

    3. Lastly, I also need something to assist in measuring the tracking
    performance of the trackballs. Do they lose accuracy while moving
    faster? DO they skip? etc. I have seen little mouse type
    applications that do similar things but nothing that records results.
    If anyone knows of something like this please let me know.

    james at retroblast dot com
  2. CWatters

    CWatters Guest

    That would measure two things the moment of inertia and the frictional drag.
    How would you tell the difference between a light ball with no friction and
    a heavy ball with lots of friction? Does that difference matter to your
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