Originial Lego Robot - 4WD, 4W steer, 5 spd transmission

[animatorSimen]

use the xl motors instead, they're so f.... strong. The rc motors need a rc unit to not stop.

[Halljac]

Whats the NXT motors for that are not plugged in?

[zakeunc]

those were the motors that would control steering. the bot is drastically different from this now though. come back soon for an update! I guarantee it will blow your mind.

[Ostemorder]

buy a inline 3 2.0 from lpepower . c o m,

that engine easly power a 5kg car.

[legostuffguy]

and snap the u-joints

[myfukingusernames]

the gear is not a good idea

[reck361]

woot thats kool add me and then look at my vids

also by the way i would give you a 5/5 rating so just work a little more and add the power functions set and the nxt for extra power and so it wont burn out

[u111fo]

you have the same motor as me!^^ VERY VERY cool car 5/5

[DTMeadows1]

Dude, I would like to know how you bulit that tranny. I've been trying to bulid something like that, only 3 speed and reverse with neutral in the middle, just like a stickshift vehicle. Also for an engine, I'd use those pneumatic pumps and cyclinders.

[monstertrucker1]

well, dtmeadows1... what u need, is a

2 gear forwoard

and 1 gear reverse

transmission, shifted -in line- by a pneumatic pump. i know the plan... if u want, i will make some photos... just write to me, if u are interested. greetings mt1 =)

[axdurian2]

what kinds of motors do you use? I would suggest some very high torque servo motors that are not really "lego" motors but can still be integrated in a lego robot

[KrystianMajewski]

You stalled the Motor while the car wasn't even moving very fast. Doesn't seem like an efficient transmission to me. What is taking away all that power?

[zakeunc]

The transmission actually is the most efficient part of this robot. The biggest reason this bot struggles in 5th gear is weight - it was pushing 12 lbs. There also are 5 places where the axel's are 'bent' via a U-joint which you probably know is always an area where power is lost. Since it has 2 suspensions the axel's must flex in 2 spots (2 U-joints in each) and since this bot utilizes rack-and-pinion steering each of the 4 wheels can angle, which causes even more power loss.

[KrystianMajewski]

Weight is not your problem. During the Anxt challenge robots were able to move over 18 kg using only NXT Motors with much greater speed. Just search for "Anxt" in YouTube. In any case, the reason for a transmission is precisely to overcome inertia created by mass. So it seems to me like you are loosing LOTS (!!) of power in those U-Joints. Even in the 1.9 version.

[zakeunc]

The AnXt bot yall made is impressive, but it is designed completely differently. I know the problem with my bot is mass. It takes a tremendous amount of power to simply rotate the wheels - each of which outweighs the hi-speed motors I am using in the engine by almost 3-1. My transmission is more of a transfer case, actually, since before it there is a 24-1 reduction (via worm-gear) and after it there is a combined 9:1 reduction before the power gets to the wheels.

[zakeunc]

There is some power lost in the mechanical complexity of the transmission, as in any, however the reason it is so slow is because of the incredible gear-reductions I have utlized throughout the drivetrain to give enough torque to turn the massive wheels and to climb. Another problem with the original robot (above) was the structural instability of the chassis. There would be so much torque that would build up the beams themselves would twist and move.

[zakeunc]

Also you should know the NXT motors intrinsically generate a WHOLE lot more torque than the hi-speed motors or the older 9V motors do. MUCH more. One as experienced with LEGO robotics, and mechanics in general, as you seem to be should know not to compare one robot designed one way to another designed a different way. This is an incredibly complex assembly and the fact it can move and climb at all is a feat itself. If you disagree I invite you to try and replicate it.

[zakeunc]

I do appreciate your criticism though.  I am still not satisfied with how even Bot v.1.9 performs and I am in the midst of rebuiling it now actually. I will be replacing the 1st layer of wishbone suspension with another swivel zone, only it will be a vertical swivel and not horizontal like I have already built - it will have both. I am also building a lockable differential, which is a huge challenge, which will sap some more power due to its complexity. The overall weight will increase too.

[zakeunc]

The struggles it has just moving, and its inability to climb are the main reasons I totally redesigned this bot. Check out my other videos of 'Bot v.1.9' which is the upgraded version. It incorporates and more efficient dual-suspension, it is lighter overall, has fourfor swivel steering which is incredibly more efficient, better gear pre and post-transmission gear ratios, and a simpler overall drivetrain post-transmission. it performs much better.

[MetalLonelyKnight]

slow...

build a motor with pistons and gearbox (your actually transmition is cool)...

[zakeunc]

thanks! Im actually almost finsished with the upgraded version of this robot. check back soon for a new, cooler video of a new, cooler robot!

[warriorider303]

i see u are using a cv joint/universal joint welll i know its a universal joint , but did u make that or did it come with a set?

[zakeunc]

well actually i am using both CV joints and Universal joints.  8 U-joints and 4 CV joints to be exact. all of them are lego-fabricated parts. the CV joints go in tandem with the steering hub and the 1st level of wishbone suspensions.

[warriorider303]

thanx, and nice car lol

[jbarryt2007]

how did you do that????? i have had trouble just trying to make a 4wd 4w steer car with one speed

[Degr8n8]

Yea i feel your pain its a big pain in the ass to get 4 wheel drive with steering what i did was i used 2 lego motors and had one motor work the left two tires and the other motor work the right two tires so that i could turn using the same concept as a differential just manualthough.

[zakeunc]

the key is structural stability. with this robot i found i had to build the chassis strong enough to withstand tremendous amounts of torque. what was happening was the gear axels were actually stressed so much that they were actually twisting and moving the beams that held them in place. significantly so - in many places. check back soon for an upgraded version with a four-for swivel steering setup and improved suspension/rigity of chassis. my new robot performs MUCH better than this one!

[theassociatedlosi]

what kind of tires are those... they look like something you modified to put on thier like from a hobby grade rc car...

[zakeunc]

they came from the lego off-roader set 8466 - which has been discontinued for quite some time and is rare - but you can still find some on ebay.

[launboy8]

You should build one of those pneumatic lego engines, like a V6 or V8 or something and put that on there.