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Thread: Pulleys

  1. #11
    500+ This must be a daytime job Jackpilot's Avatar
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    Re: Pulleys

    Seems much more precise than a pot...could be a great addition.

    Maybe Mike Powell could enlighten us....Mike ...Hello...Anybody Home???
    Jackpilot
    B737-700 Posky
    FS9/P.Magenta
    without PMSystem

  2. #12
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    Re: Pulleys

    Jackpilot,

    An LVDT provides an AC voltage output, that can be filtered to
    obtain DC voltage ( with a simple diode bridge ). You can build one,
    and using the variable voltage output to get the position.

    For mounting it on the throttle quadrant, you have many options.
    You can mount direct on the throttle, that you will move the
    LVDT in and out.

    As an Optical Encoder, you could print a hi resolution print, a simple
    circle with some things, and a infrared led and photo-transistor.
    Then attach the circle in a way that it rotates with the throttle.

    You need to provide some friction to the throttle, as this methods have
    like zero friction, and so have a very low wear.

    With the LVDT, the resolution is manly dictated by the LVDT construction,
    some exciting parameters ( the LVDT should be excited by an AC voltage ),
    and if using digital electronics for reading the LVDT output ( and you will ),
    the resolution of the digital converter.

    With the digital encoder, the resolution of the printed circle is what determine
    the resolution of the encoder.

    Nice info about LVDTs:
    http://www.mikesflightdeck.com/lvdts.htm

  3. #13
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    Re: Pulleys

    Some drawings to clarify



    First is the one with LVDT.
    Second and third is with optical encoder, with two mounting options;
    in the side of the circle and in the circumference of it, respectively.

    In the LVDT mount, the response is not linear, because the manner the
    LVDT and the throttle are mechanically connected. You can get a linear
    response from this non-linear response, with many ideas.

  4. #14
    500+ This must be a daytime job Jackpilot's Avatar
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    Re: Pulleys

    Jackpilot
    B737-700 Posky
    FS9/P.Magenta
    without PMSystem

  5. #15
    75+ Posting Member cscotthendry's Avatar
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    Re: Pulleys

    Uh oh! Jackjack is going to burst into flames!
    Regards: Scott Hendry
    www.scotthendry.com

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