Little Boy- Lego Technic Rock Crawler (With Instructions)

27 09 2011

IMG_1514 by yoraish

A rock crawling remote controlled vehicle. No obstacle too tough for it!

*Instructions Tab*

For a long time a saw other people build or drive rock crawlers, and their abilities amazed me. I never thought XL motors could give so much torque for a vehicle to give it a chance in going over the obstacles it clears. So I thought why not give it a try and see how good can I get?

The outcome is much much better than I expected, it can literally go over everything (well not everything, but lots of stuff :)). The first thing I started with was the suspension. Which is the four link suspension of course. From my prior experience I thought the links in this kind of suspension must all originate and end in the same line. But after a little research I figured out they don’t have to, a thing that really helped. The next thing I paid attention to was the chassis and the axles, lets start with the chassis. Chassis for a rock crawler must be dead simple and lightweight. So what I did was to build 2 flat (2D) sides of the chassis and connect them with horizontal liftarms. The chassis consist a battery box mounting place, a receiver and 4 ball joints to mount the shock absorbers on. And now for the axles, a rock crawler needs 2 strong solid axles. The rear axel was just a solid one. But the front one had to be steered, in order to get rid of ant U-joint problems I mounted the steering M motor to the axel itself.

That’s it for the design. Lets move on to its performance. In my opinion it has optimal speed. It isn’t too slow and boring and not too fast-it doesn’t slip off obstacles because of its speed.  If we talk about slipping, I must say that that the Lego tires impressed me. I never thought they will be so good! And the suspension works great as well. It has about 45 degrees of travel on each side, and as I know- thats good ;)

As I always write, a conclusion. So what are we left after all this rubbish?

  • A cool rock crawler with a VW Beetle  body
  • 4 link suspension
  • Lights
  • 2 XL’s for drive + M for steering
  • 4×4
Pictures!!!<<<<<click it
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24 responses

29 11 2011
gtapawner

i got at saturday power functions !!! 1 controller 1 reciever 2 xl motors 1 m motor

13 12 2011
Adam Davis

I love this project and want to have some of my middle school students build it. However, they need building instructions. Can they be provided?

13 12 2011
yoraish

As you could have read in the description they are already made. All you need to do is is click on the Instruction tab above and download the .lxf file.
I really appreciate your decision choosing my creation! Please keep me up to date with your progress. (Video is the best option if you could arrange that :))

P.s. Don’t forget to watch the Corrections video for the instructions, because they are not perfect. LDD doesn’t have all the required parts.

14 12 2011
Joseph

Where can i get these parts?

14 12 2011
Joseph

If you made kits for this i would love to buy one, as long as the price is reasonable

14 12 2011
yoraish

I have not made any kits for this model. You can buy Lego over at bricklink.com .
Also keep in mind that the instructions does not include the body- only the chassis. You might want to take a look at this thread http://www.eurobricks.com/forum/index.php?showtopic=60544&st=0
it answers some questions and has a part list somewhere.

10 01 2012
Fabian Naier

Hello Yoraish

Ive got a Question:
Id like to build your Little boy Rock crawler, but I havent all of the “special” bricks.
Now, Id like to now from were, do you have this brick or were do you buy your brick for your creations.

Greetings
Fabian

10 01 2012
yoraish

I’m glad you liked it!
I usually buy bricks from Bricklink.com.

15 01 2012
Fabian Naier

Thank you for your answer but i can’t fin the “lt steering gear” can you please post the link for this part?

Thank you!
Fabian

15 01 2012
yoraish

I can’t see any part called “lt steering gear”. Are you talking about a gear, or a part used for steering?

15 01 2012
Fabian Naier

Can you give me your E-mail adress, than I can send you an Image of this brick.

Fabian

15 01 2012
yoraish

You can send it to steampunk1577@walla.com

27 01 2012
daago

i am very impressed. i love it and i couldn’t come close to that. i want to build it but i don’t have pf, so is there any way to do this with an NXT and motors?

P.s. what remote do u use?

28 01 2012
yoraish

Thanks!

There must be a way, that you must come up with yourself.

And I’m using the Power Functions remote.

28 01 2012
daago

thank you! can you use the pf remote with an NXT? I will come up with a way then hopefully post it on YouTube. i will also send you pics by e-mail if you want.

28 01 2012
daago

my B-day is also coming up, so i wish to get a Lego jeep. there might be some different parts due to lack of pieces.

28 01 2012
yoraish

Sounds great! I would love to see pictures.

There is a way to use pf remote with NXT:

http://www.hitechnic.com/cgi-bin/commerce.cgi?preadd=action&key=NIR1032

1 02 2012
daago

i tried to make the front but i only have 4 of the 4 links, 3 live axles, and i am lacking a few other essential pieces so it might take time. i also might need to work to get that piece needed for the remote. the estimated time will be 1 month if i don’t run into any problems.

6 02 2012
legoli

please send instruction ^_^

benstone4_4@hotmail.com

3 03 2012
nico

where’s the instructions ?

3 03 2012
yoraish

In the Instructions tab at the top of the page.

21 07 2012
Leo

Does exist instructions of the Tube Chassis?

5 09 2012
Jay

Okay 1st where do i get the parts for this awesome project 2 where can i get the instructions besides uptop i cant open that for some reason really wierd huh well thx yoriash lemme know

5 09 2012
yoraish

Hello,
you canbuy parts from bricklink.com .
Try and download LDD again.

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