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Trying to create rotating device/minimum speed. Could use some advice!

Discussion in 'General Electronics Discussion' started by schizotypal_boy, Apr 5, 2012.

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  1. schizotypal_boy

    schizotypal_boy

    3
    0
    Apr 5, 2012
    Hi there..

    So, I know pretty much nothing about electronics but have been trying to create a device that will rotate a painting, as slowly as actually possible..

    I picked up one of these http://www.mfacomodrills.com/gearboxes/918d_series.html (918D1001ME) Ideally, I would have a motor this size, that could have it's speed regulated by something like this: http://www.maplin.co.uk/panel-mounte...r-module-30310 but due to the voltages not being compatible, this seems not possible. One person mentioned buffering the circuit with a transistor but I tried to look into that and it seems way beyond me! Am I right in thinking I can use the speed regulator with this motor, and it would be possible to slow it down as slow as it can go? http://www.maplin.co.uk/large-single...earboxes-43368 (148:1 Lge Gear Box)

    I would hugely appreciate any thoughts, ideas, links regarding this.. I literally want to fix a motor to the back of a 50 x 50cm painting and have it rotate counter clockwise at minimum possible speed.. and I don't have much time left! :S

    Thanks for reading and I look forward to hopefully a simple solution!

    C.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,993
    2,498
    Nov 17, 2011
    http://www.maplin.co.uk/panel-mounte...r-module-30310 -> HTTP 400

    What are the ratings of the motor you use (Volts, Amps, RPM)? Which gearbox do you use (there are quite a few different ones on the page you linked)?

    You can always just try at which voltage the gearbox spins at a rate suitable to you. Adjust the voltage with an adjustable power supply (or, less elegant, use series resistors to that purpose). Once you know the right combination of voltage and/or series resistor you can find (or build) the matching power supply for your project.

    Harald
     
  3. schizotypal_boy

    schizotypal_boy

    3
    0
    Apr 5, 2012
    Thanks for your reply.. Strange, the links from Maplins that I provided doesn't seem to route back to the page I copied the link from..

    I did try putting a resistor between the triple A battery pack and the motor, and it reduced the voltage from 1.5 to 0.8v, but I need it slower still.. I tried to attach another resistor so that there would be two which I thought potentially would reduce it a further 0.7v to 0.1v I guess, but nothing happened.. As I mentioned before, I am a complete novice and have very little idea what I'm doing..

    this is the speed regulator I mentioned, in any case: http://www.ebay.co.uk/itm/PANEL-MOU..._Control_ET&hash=item4ab5201f97#ht_2392wt_983

    The motor I have is 918D1001/1 (1.5v - 3v) WITH RE 280 MOTOR (RATIO 100:1). 4mm SHAFT

    and the larger one I mentioned is 950D1481 (4.5v - 15v) WITH RE 385 MOTOR. RATIO 148:1
     
  4. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Does it need to be an electrical solution? Maybe you could add some more gears to the gear motor. Or add some pulleys to reduce the speed. How about a disk of quarter-inch plywood where the wood edge has been routed in the fashion of a pulley, attached to the back of the painting, and the other smaller drive wheel is put on the shaft of the gear motor? That could easily give another 20:1 speed reduction.
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    10,993
    2,498
    Nov 17, 2011
    I too think a mechanical solution will be the better option. If you reduce the power to the motor too much, it will not start, as you have observed. You need a certain minimum power and with that comes a minimum speed of the motor.

    By mechanically reducing the speed you gain two advantages:
    1) you don't waste power in a series resistor - your battery will last longer.
    2) you have more torque available

    Harald
     
  6. schizotypal_boy

    schizotypal_boy

    3
    0
    Apr 5, 2012
    thanks for all your advice.. I will certainly take note and give the mechanical option a whirl.. I think I need it to go about 1 rotation per minute..
     
  7. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    You could consider intermittent operation, say 1 second every 10 seconds.
     
  8. thor

    thor

    4
    0
    Apr 2, 2012
    Sorry guys I have nothing to share, just new here and tying to learn my ropes. But your idea of a rotating painting is really cool. Goodluck!
     
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