Nico71's UNIMOG Axle Building Instructions

[DLuders]

On his Brickshelf Gallery, Nico71 has posted 25-step Building Instructions for his Lego Technic Unimog Axle: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=440484 . He wrote "Building instructions of the axle of my unimog, the best I have made. Powered by SR3D builder and Lpub4." 47 photos of the axle assembly appear at http://www.brickshelf.com/cgi-bin/gallery.cgi?f=440367 . The Unimog uses a "94mm wheel, very strong portal axle with turntable, pendular axle with shock absorbers, BB [battery box] in the frame...."

[backbone]

4L Universal joints.

And those Bevel gears:

Heavy duty? I think this word isnt perfect for this axles.

[Jurgen Krooshoop]

If you take a look at the video, it seems pretty powerful:

[backbone]

If you take a look at the video, it seems pretty powerful:

Now maybe is powerful, but add 1 kg of weight, and those bevel gears will break.

[darksheep]

Now maybe is powerful, but add 1 kg of weight, and those bevel gears will break.

are teh back and front axels the same ?

[Anio]

Now maybe is powerful, but add 1 kg of weight, and those bevel gears will break.

Yeah. And if you add 50 kg, the chassis will break. -_-'

The model is perfectly optimised. It works damn good !!!!

I played with it last week end during a meeting : it goes easily everywhere where any other truck has difficulties, or even don't succeed to pass an obstacle.

In short : the best truck trial I have ever seen.

Edited August 5, 2010 by Anio

[backbone]

The model is perfectly optimised.

Maybe yes. But deffinately not for polish trtr condintions and terrain.

This is reason why this is weak for me personally.

Edited August 5, 2010 by backbone

[nico71]

Heavy duty? I think this word isnt perfect for this axles.

Hi, for me, built 4kg truck isn't a optimised truck. That is the reason I have chosen to built the more lighter as possible. Lego isn't modelling, the motors are low powered and the plastic isn't very resistant. The frame is enought rigid for 1kg, for 2kg no, but in lego we build only what we need, The truck is optimised for its power and its weight.

For the axle, even if it has bevel gears and universal joins, if I block all wheel and I run, the XL will be stalled without break parts. So the axle is very strong, mount it if you aren't convince. This truck could participate to the polish races, for me, built lighter avoid breaking parts, that not the case for the huge TT of polish races.

That the same reason why I prefer lotus with 200hp instead veyron (2t) with 1000hp (spite of the fact buggati is french ^^). Do you understand my choice about design process ?

Edited August 5, 2010 by nico71

[Jurgen Krooshoop]

And those bevel-gears could easily be replaces by knob-wheels to make it stronger. To have the same power, you'd have to an an additional gear-reductions stage in the drivetrain, which would propably make the model more co,plex. I agree with Anio & Nico71 that building an optimized vehicule is more preferable than making it as strong as possible. If the XL-motor stalls if all the wheels are blocked (and it does), than the drivetrain is stron enoug IMO.

[Parax]

Now maybe is powerful, but add 1 kg of weight, and those bevel gears will break.

In this case That is NOT correct! Normally I would agree, BUT in this moc there is a geared wheel hub (3:1) so the stress is no way near as high on the bevel gears or the UJ's. they rotate 3 times faster and have 1/3rd of the torque. This is a good design. Try it out and see.

Parax.

[backbone]

In this case That is NOT correct! Normally I would agree, BUT in this moc there is a geared wheel hub (3:1) so the stress is no way near as high on the bevel gears or the UJ's. they rotate 3 times faster and have 1/3rd of the torque. This is a good design. Try it out and see.

Parax.

Ok, build and do some tests. Hold a wheel with your hand - and look, to divetrain. Guess - bevel gears / u -joints will break, or motor will stop?

[nico71]

Ok, build and do some tests. Hold a wheel with your hand - and look, to divetrain. Guess - bevel gears / u -joints will break, or motor will stop?

I have said the motor will stop in this case.

[backbone]

I have said the motor will stop in this case.

Ok, perform the test and publish results :)