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Need a small remotely controlled motor w/ self-contained power

  1. Oct 23, 2011 #1

    DaveC426913

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    I wish to construct a device comprised of beams that grow and shrink by as much as 300%. The beam lengths will be controlled by motors in a specific timing and sequence.

    I cannot supply power or control to the motors from an external source because the object will turn itself inside out, rendering any umbilicals impossible.

    I want a motor that is
    - small
    - battery-powered
    - can be actuated remotely by a computer (via radio receiver I guess)
    - can have its motion converted to a piston

    Any ideas? Looking for suggestions for:
    - the right motor
    - how the motor will be powered (batteries will suffice)
    - the way the motor will actuate the beam pistons
    - a transmitter from the computer to control 32 of these motors
    - the right receiver that receives the signal and activates the motor

    Oh. And a "weekend hobby" budget. :biggrin:


    An example of growing/shrinking beams can be seen here:
    MegaSphere.jpg
     
  2. jcsd
  3. Oct 24, 2011 #2
    Are you sure you want a motor? Sounds like you might actually want a solenoid.
     
  4. Oct 24, 2011 #3

    berkeman

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    Staff: Mentor

    I'd start with a small RC car, and look at ways to convert the rotational motion to linear motion. Some sort of screw drive would probably be the strongest...
     
  5. Oct 24, 2011 #4

    DaveC426913

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    Yeah except it will need to extend by 300%. Like from one foot to 3 feet.
     
  6. Oct 24, 2011 #5

    DaveC426913

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    Yeah. 32 RC cars...

    Perhaps this project is unfeasible.
     
  7. Oct 24, 2011 #6

    berkeman

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    Maybe look at car antennas that extend in multiple sections. They must have some interesting interlocking screw drive sections or something similar...
     
  8. Oct 24, 2011 #7

    DaveC426913

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    Ooh. now that one's a great idea! Thanks!
     
  9. Oct 24, 2011 #8

    berkeman

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  10. Oct 26, 2011 #9
    That's not how retracting car antennas work. The antenna has a flexible plastic rod inside of it that extends or retracts by winding or unwinding from a spool powered by a motor.
     
  11. Oct 26, 2011 #10

    DaveC426913

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    The fact remains, it is the perfect tool for the job I need.
     
  12. Oct 27, 2011 #11
    That's a clever mechanism. I did not know that.
     
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