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Thread: Lumia motor pulley system

  1. #1
    Join Date
    Apr 2009
    Location
    North of Jackson Michigan USA
    Posts
    316

    Default Lumia motor pulley system

    Greetings, all;

    For me, I can never get my lumia going slow enough. Research continues, but here is a means of dialing down while ramping up.

    I have long been a champion of these motors:

    http://www.ebay.com/itm/12V-DC-2-RPM...-/400988936731

    Click image for larger version. 

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    Available in a variety of speeds, 2RPM is the slowest I’ve found.
    Still too fast.

    Soooo, you rig it into a pulley system with a ~3:1 slow down:

    Click image for larger version. 

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    Pulleys are available here:

    https://www.pololu.com/product/111

    They also sell the 5mm hubs shown attached to the disk above.

    https://www.pololu.com/product/1998

    The disk shown was cut from 1/8” plexi with a laser cutter, then smeared with epoxy.

    The support was machined from a 1” x 2” section of aluminum angle iron.

    This gets you pretty slow, but to crank it down further, I use a PWM speed control:

    Click image for larger version. 

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    Available here:

    http://www.ebay.com/itm/151681732135...%3AMEBIDX%3AIT

    Dirt cheap (<$10 with shipping), tiny, works a treat.

    I hope this helps some Lumiators out there.

    Will add to Lumia Wiki when it is back up.

    Cheers…Mike
    Runs with Lasers

  2. #2
    Join Date
    May 2014
    Location
    Connecticut
    Posts
    666

    Default

    Nice, thanks! I'm looking into building my first lumia, and this helps greatly!

  3. #3
    Join Date
    Jun 2013
    Location
    Sydney, Australia
    Posts
    243

    Default

    Getting some parts together to make one too, saw this you might like, have ordered one to try out, will keep you posted....

    http://www.ebay.com.au/itm/271944207184

  4. #4
    Join Date
    Nov 2013
    Location
    St George UT
    Posts
    118

    Default

    Interesting thread. I'm working on a lumia box as well. I'm driving the wheels with cheap 12 DC motors, and I'm driving the motors with spare GM-20 amps I have in my projector. This way, I can control the speed of the motors to an extent, and since my amps are bi-polar, I can reverse the rotation.
    For media, I'm using scrap shower door glass I talked the local glass shop out of. Glass shops usually have broken bits and scraps of all sorts of patterns laying about, and sometimes they will just give you some when they see what you're doing (bring a laser pointer)
    I bought a 4" dia diamond hole cutter on Amazon for about $10. You need a drill press to cut the circles, and you have to build a little "dam" out of modeling clay around the circumference of the cut. The dam is then filled with a little water to cool the diamond cutter. Keep the cutter wet all the time, and DO NOT TRY THIS WITH A HAND DRILL!!!! You can then use a Dremel diamond drill (also in the drill press) to cut the mounting hole using the same clay dam/water trick
    I'm a little leery of plastic, since I have had them burn when hit with powers over a watt or so.
    To select colors, I am going to direct outputs of 4-5 diode lasers of different wavelengths onto GM-20's with mirrors mounted to the shafts 'a la scanner. The individual beams will be walked across a row of pick-off mirrors (soldier mirrors) that direct the beam(s) through the media disks. If I get the layout right, I'll be able to get the individual beams through one or several of the wheels. That's the theory, anyway.
    I'll post photos as I progress.

  5. #5
    Join Date
    Jun 2010
    Location
    Syracuse, NY
    Posts
    287

    Default

    I'm looking into building another lumia soon. I have a bubbled glass light fixture I found at a hardware store and I'm looking at using these.

    http://www.ebay.com/itm/201465923408...%3AMEBIDX%3AIT

    The goal here is to maintain a shallow lumia box with a vertical projection onto the ceiling. They only provide a 2:1 ratio but with a gear reduction motor and a PWM controller like the ones you linked they should still work well.
    LASERS!!

    1x Homemade 500mW 405nm Projector
    1x Homemade 1.2W RGB Projector
    1x Lightspace Color Ray Series 6W RGB
    2x Lightspace Venus 2W RGB

    ZPL Lighting www.zpllighting.com

  6. #6
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    972

    Default

    I just bought a couple of these...
    http://www.ebay.com.au/itm/271944207184

    They are quite small at 46mm X 32mm X 26mm
    with high torque.
    With PWM on the DC motor I should get this to go
    down to almost a dead stop.

    Jerry
    See the LaserBee II and all other LaserBee LPM products here....
    All LaserBee Laser Power Meter Products

    New 3.2Watt RS232/USB LaserBee II LPM REVIEW


    Always in stock and ready to ship....
    Subsidary:-Pharma Electronic Solutions

  7. #7
    Join Date
    Nov 2013
    Location
    St George UT
    Posts
    118

    Default

    Those of you looking for glass media might want to check out http://www.whittemoredurgin.com. They sell stained glass supplies and have a sample box of various stippled glass for about $30. I've heard that there are a lot of useful samples, but they are only 2" x 3". Too small for my project, but a lot of folks might find this useful.

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