Instructables

R/C LEGO® "The Bull" Buggy

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There are more than 20 models of LEGO®'s Dune Buggy type car, even more than the models in LEGO® Race Car category.
Dune Buggy is usually four wheels drive off road vehicle,  which would not be used on the road.

Now that I got excited on the "dune buggy", and was also inspired by 1998 LEGO®'s Turbo Command 8428/8432 (See picture 6 and 7), I designed my own buggy, "The Bull" Buggy

"The Bull" Buggy is larger, and more complicate car to build than my two other LEGO cars, R/C Lego Car (or R/C Lego Car Redux) and Wireless Lego Car. It needed bigger or more power (torque) to drive the car. So I decided to use round 24mm. diameter with 9V input power. That made me to design another version of 3D printed motor housing (See details in Step 1.)

This 3D printed motor housing was designed to be used with the Lego's parts, and compatible with Lego Modular System just like my smaller version of the motor housing for 130-type DC motor (See Step 1 of my R/C LEGO Car Redux.) 

After I built the first "Bull" Buggy, I realized that when I want to access the Palm Arduino and motor controller PCB, I had to tear apart the rear frame to get to PCBs. So I altered the design by adding the hinges to the rear frame so I can just flip the rear roll cage up instead of tear them apart (picture 2 and 3.)

The "Bull" Buggy's  features:
  • Shock absorbers.
  • The chassis is not all paralleled to ground.
  • Can be constructed without shock absorbers as an alternative, so the chassis is all paralleled to ground level. With this alteration, the motor could be mounted using the side holes on the motor housing to and connectors to mount to the LEGO bricks (photo 5, or see Step 11 for details installation)
  • Rotatable rear roll cage.
  • Switchable steering wheel. (Can be switched between the left side and the right side of the vehicle.)

Lego Bricks or parts are already reusable/recyclable products. And it could be passed on to the next generation just like all the Lego parts do. I would say this is the right way to solve the problem and more "green" than hacking toy R/C Motor housing, like I did earlier with R/C Lego Car and Wireless Lego Car projects.

For the wireless control, I used XBee module as an alternative) for controlling the car wirelessly, similar to my previous cars, R/C Lego Car, Wireless Lego Car, Ford Mustang Arduino Controlled R/C Car. (Picture 8)

More photos and video in Step 13.


Disclaimer:
LEGO®, TECHNIC, are property of The LEGO Group of Companies (http://www.lego.com), which does not sponsor, own, authorize or endorse this creation.

 
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ella101 year ago
Wow I always build Legos and I never thought of that
sath02 (author)  ella101 year ago
Thanks.
I like the back suspension!
sath02 (author)  technicgeek101 year ago
I like them too!
armstk1801 year ago
Really nice !
I like your ideas !
sath02 (author)  armstk1801 year ago
Thanks for the kind words.
gcanders1 year ago
Outstanding. I just finished building a techniques model and am using some of the designs for my Arduino robot schematic. Your motor housing is awesome. What do you use to secure the motor in the housing. I see where you can secure it with screws through the holes, but I can't see them in the final design. And have you had any problems with the heat from the motor melting the 3D material?

Thanks,
sath02 (author)  gcanders1 year ago
Thanks and looking forward to see your robot post on instructables.
Yes, it needs M2.3 (about 4mm long) screws to secure the motor to the housing. The screws did not come with the motor, because I got it as used motors from eBay.
The 24mm motor housing as used in this instructable was a first prototype, it still has round mounting holes, t he latest version has two pill shape mounting holes. So it could accommodate the different distance of the mounting holes.
I did the test run eight times (for video shooting, the last one shown in Step 13). I looked at the motor, as I aware of the mounting screw as well. The motor shifted (rotated) away a little bit. For the heat and the 3D material question, I can removed the motor out and did not see any sign of melting 3D material on the motor or on the motor housing itself. I will try to do more heavier test run than what I had don before, may be doing it outside!
Thanks for your good question and observation! :)
andrewt1 year ago
That's so awesome. Is the mount model public on the 123D site?
sath02 (author)  andrewt1 year ago
Thanks.
Yes, it is public on 123D site, here is the link,
http://www.123dapp.com/FullPreview/Index.cfm/ID/1540902
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