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Discussion in 'Electronic Design' started by Dirk Bruere at NeoPax, Oct 31, 2008.

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  1. GregS

    GregS Guest

    Some turntables fed off a variable frequency power amp. The frequencies
    just jumped, instead of slewing. Other than a servo unit, I think a simple
    DC motor with a gear or belt drive would do it.

  2. That's what I thought, but I was hoping someone somewhere sold such an
    item cheaply, probably for other uses.

    Dirk - Transcendence UK - A UK political party - Our podcasts on weird stuff
  3. GregS

    GregS Guest

    The stirrer plates used in labs are too fast and not enough torque.
    Look in the Jameco catalog under gearmotors. You shold be able to grab a large
    diameter hub somewhere.

  4. Guest

    Go to a hobby shop and check out the selection of Tamiya gearbox kits.
    There might be something there of interest.
  5. Rich Grise

    Rich Grise Guest

    Potter's wheel?"potter's+wheel"&btnG=Search+Images&gbv=1

    Weld positioner?"weld+positioner"&btnG=Search+Images

    Have Fun!
  6. Possibly potter's wheel.
    I'll check prices, but need a speed controller.
    Maybe the model shop gearbox the netzero guy suggested.

    Dirk - Transcendence UK - A UK political party - Our podcasts on weird stuff
  7. Carl Ijames

    Carl Ijames Guest

    That's 30 to 600 rpm. Chuck it in a variable speed hand drill, the kind
    where the trigger pull controls speed and it has a set screw on the trigger
    to make it reproducible, or take a small dc muffin fan and run it off a
    variable dc supply (cut off the blades if they bother you). We used the
    muffin fan idea back in school, with a small glass plate glued on the hub to
    put grinding paste on, to polish the ends of glass fibers. If you need
    faster chuck it into a dremel tool, but they go up to 6-12000 rpm so the low
    end speed control is very coarse.
  8. mpm

    mpm Guest

    Option-1: Gerbils. ?
    Plus, a supply of other Gerbils injected with varying doses of
    testosterone. ?

    Sorry. Let me put my weekend serious cap on:
    One of my standup drill presses uses a two-pulley system (multiple
    Adjusting the belts changes the speed and torque.
    Also, what about a microwave oven turntable? Can you do anything with

  9. Cheap mains fan with an added speed controller.
    Would a dimmer switch work, or is the load too inductive?
    Maybe an auto transformer?

    Dirk - Transcendence UK - A UK political party - Our podcasts on weird stuff
  10. Too slow probably.
    And my oven is still working, despite all the graunching noises from the

    Dirk - Transcendence UK - A UK political party - Our podcasts on weird stuff
  11. K Ludger

    K Ludger Guest

  12. Rich Grise

    Rich Grise Guest

    Microwave ovens are free, if you know where to dumpster-dive. ;-)

  13. JosephKK

    JosephKK Guest

    I have several ideas based around variable speed hobby motor /
    controller combinations.
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