Jeep Crawler

[Technic156]

Hey everyone,

I have finally finished the crawler. It took me awhile and a lot of versions till I liked something. So lets get right into it.

Features:

• 1 XL motor for drive
  
• 2 Servo motors for steering
  
• 2 IR Receivers
  
• LED lights
  
• 2 Speed gearbox with M motor for remote changing
  
• 1 Lego Lipo battery
  

Images:

I took some ideas from Madoca1977 and Nico71(which are some great builders)

I hope you guys and gals enjoy!

[BusterHaus]

First time I see two servos used for steering, it's a neat solution. How's the steering without differentials?

[Technic156]

I think it does fine. Yea I wanted to do 2, so i can control them separately.

[MajklSpajkl]

Cool! Are those 96 or 108 mm tires? I bought 108 mm and they don't look so wide, so I'm guessing the smaller ones.

[Technic156]

1.9 rc tires. Basically the same as the 94.8 Lego balloon tires

[Rishab N]

Nice work

[AndyCW]

What are the two gears in the transmission?

The body looks a little short. Like it was put in a compactor and flattened.

I'm sure the performance is good. When can we expect a video?

v/r

Andy

[Technic156]

I guess it's short.

H: 1.1

L: 1.16

[MajklSpajkl]

I've built two similar setups with two servos. The first one had really bad bracing on the steering bevel gears, so they got too loose and malfunctioned, the second one (top line, middle photo) was i think too long - the distance between axles was a bit to big. I think you might encounter the problem of getting stuck with your jeep while overcoming top of the hills.

[OneMoreRobot]

Nice work

[Zerobricks]

I would just spread out the 6L links so they are parallel and dont create unnecesary friction. Other than that good work

[Boxerlego]

Excellent work! Those 3rd party tires make the LEGO Jeep look realistic.

[Auranapse]

Will look forward to a video to show it's capabilities if you're making one!

Looks pretty nifty :D

[Technic156]

Thanks guys!

I have to take the 4ws out since I am having a problem climbing up a ramp I made. Making the rear wheels unstable and won't grip. I plan on doing a video but not sure when yet.

[filsawgood]

Well done! I like it!

[Technic156]

So I am back with a whole new chassis for my Jeep lol. I got rid of the 2 speed gearbox and went with a 36 tooth gear for torque. The chassis is a lot more stronger and the suspension seems to do better. The final gear ratio is 1:15. I haven't forgotten a video for the performance, just been busy and was going to do it today but camera was died lol.

[a_h_adl]

Nice improvement

[Technic156]

Thanks!

[Zerobricks]

I suggest you to use the 12:36 gears INSIDE the frames. This way you will ahve more gearing on the axle (less torque twist) and less torque on the U joint inside the ball joint,

[Technic156]

I suggest you to use the 12:36 gears INSIDE the frames. This way you will ahve more gearing on the axle (less torque twist) and less torque on the U joint inside the ball joint,

Not sure what you mean. Like add another side of gears to the driveline?

[AndyCW]

Keep the hubs 24:8 (3:1)

Change the center section each axle to 36:12 (3:1)

Change the key gear ratio off of the PF large motor to 20:2 (1.67:1)

This will reduce the load on the u-joint in the ball joint.

15:1 gear reduction on a PF Large seems like overkill. In my experience 5:1 is the middle of the road. Which receiver version are you using?

v/r

Andy

[Nico van Duin]

It looks like there is not enough space for a 12:36 combination because of the servomotor

Edited November 27, 2014 by Nico van Duin