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A simple RC platform, approximately 24" x 24", capable of moving 100 lbs. on sand.... — Parallax Forums

A simple RC platform, approximately 24" x 24", capable of moving 100 lbs. on sand....

qwerty11qwerty11 Posts: 3
edited 2013-06-22 11:04 in Robotics
I need some help with this idea. Like the subject says I need a platform 24" x 24" capable of moving 100 pounds on sand. Max speed needed is 3.5 - 5 mph. Frame will need to be built out of wood probably using 2x4s. Maybe use something like this for the tire: http://www.northerntool.com/shop/tools/product_200331323_200331323 Idea is to have four tires and each side will be indipendently controlled. I.E. to turn you could reverse the left side tires and forward the right side. I'm starting from scratch and don't really have any idea where to start.

Comments

  • PublisonPublison Posts: 12,366
    edited 2013-05-14 10:43
    qwerty11 wrote: »
    I need some help with this idea. Like the subject says I need a platform 24" x 24" capable of moving 100 pounds on sand. Max speed needed is 3.5 - 5 mph. Frame will need to be built out of wood probably using 2x4s. Maybe use something like this for the tire: http://www.northerntool.com/shop/tools/product_200331323_200331323 Idea is to have four tires and each side will be indipendently controlled. I.E. to turn you could reverse the left side tires and forward the right side. I'm starting from scratch and don't really have any idea where to start.

    Welcome to the forums!


    How much do have to spend?

    The QuadRover will pull that load @ $5,000. Unfortunately, they are no longer available.

    http://www.youtube.com/watch?v=j1GK00oe170

    G    as Powered?

    Battery Powered?.
  • qwerty11qwerty11 Posts: 3
    edited 2013-05-14 10:51
    Publison wrote: »
    Welcome to the forums!


    How much do have to spend?

    The QuadRover will pull that load @ $5,000. Unfortunately, they are no longer available.

    http://www.youtube.com/watch?v=j1GK00oe170

    G    as Powered?

    Battery Powered?.

    Thanks for the welcome!

    I would like it to be as cheap and simple as possible and still accomplish the task. This is just going to be a platform for me to play around and have fun with so I certainty don't want to break the bank.

    It definitely needs to be battery operated.

    The TX/RX will be Spektrum 5.4ghz.
  • PublisonPublison Posts: 12,366
    edited 2013-05-14 11:02
    Those are pretty big tires to drive. I'll have to let some of the robotic experts chime in. Mine robots are limited to less than 1 LB. :)
  • qwerty11qwerty11 Posts: 3
    edited 2013-05-14 11:09
    Publison wrote: »
    Those are pretty big tires to drive. I'll have to let some of the robotic experts chime in. Mine robots are limited to less than 1 LB. :)

    The other option, if it would be easier, would be rigging this to be RC drivable (http://www.northerntool.com/shop/tools/product_200411313_200411313). I'm ok with whichever would be easier. With the wagon all I would need is a motor to modulate the pivot attached to the front axle and the motor(s) for the drive wheels in the rear.
  • PublisonPublison Posts: 12,366
    edited 2013-05-14 12:24
    Anyone remember the guy that built a platform to haul around his computer stuff?

    I remember his avatar had a cat in the corner with red eyes.
  • fixmaxfixmax Posts: 91
    edited 2013-05-14 13:42
    Well, I have used these on a large rover project, and they moved it just fine.

    http://www.ebay.com/itm/Pair-Quickie-Sunrise-Medical-Wheelchair-Power-Chair-Motors-and-Wheels-/111069297657?pt=LH_DefaultDomain_0&hash=item19dc3efbf9

    They are typically about $150-$200 per set though.

    They come with brakes that you can remove, and are 24V powered.
  • SiscoSisco Posts: 5
    edited 2013-06-18 22:11
    Just pick up a used electric wheelchair. Its a prebuilt platform, you just need a way to either connect into the current joystick/controller (I just messaged someone on this forum about such a method) or you need to pick up a motor controller like the Sabertooth 2x25.

    This is just a wheelchair base, a sabertooth 2x25 and a cheap R/C receiver. It's being controller with a Specktrum DX transmitter.

    Rick
  • SiscoSisco Posts: 5
    edited 2013-06-18 22:22
    The video I posted above was my first test of the project. The next test I welded mounts on the top so I could place a removable steel box on the base. The box held the sabertooth 2x25, the r/c receiver and an arduino. The arduino merely read the incoming R/c commands and passed them on to the sabertooth. This way later i could use the arduino to control the base, add sensors, etc. This setup will push a 55gallon can of water around the yard with very little effort. It will carry over 350lbs.

    The current tires should be changed because they are for inside use. You want something with outdoor tread.

    This first test/prototype is currently sitting in my spare room and I am now onto designing the actual Project ATLaS. Below is a photo of where I am so far..

    474789_588529327846334_254463347_o.jpg


    1008275_588115557887711_1671497434_o.jpg
    474789_588529327846334_254463347_o.jpg
    1024 x 768 - 73K
    1008275_588115557887711_1671497434_o.jpg
    1024 x 768 - 79K
  • kwinnkwinn Posts: 8,697
    edited 2013-06-19 08:19
    If this is for use on hard sand like that shown in post 8 you could buy a power chair and use the parts from that to start. If it is loose sand such as that found on a beach tracks would be much better.
  • FalconFalcon Posts: 191
    edited 2013-06-22 11:04
    I hope this isn't a high-jack, but where did you get the track assemblies? I can see where they would be great in sand.

    falcon
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