(WIP)(LDD)LEGO Technic Train

[Imanol BB]

Hello everyone, some time ago i got amazed when i saw the lego trains, and after a long time watching thems i wondered, if there was any lego technic train, so i decided to search, and i didnt find any one,i ve just found some trains on internet, but none really a technic model, so i wanted to make one by myself, so here it goes:

This is the main idea its to have a fully working lego technic train, i wanted to make it to work without rails (because it would be to hard to make or buy them), it would work like a crane like movement.

The whole model isnt very good because i had almost no time to make it, the idea its to have 2 bogie motors, both powered and steerable, i have used normal wheels with tires, because normal lego train wheels arent enough big or grippier, also the profile and the look wouldnt work, so i made this:

The bogies would be powered by XL motors in the frame (from the green part) and rotated by servos, the drivetrain its like a normal truck rear transmission (but without suspension), differentials are to prevent damage to the axles during turning:

And this is a picture showing how it would work:

I know this model is really ugly and simple, but is because i hadnt time and im first designing the working parts, there are obviously some strength problems, but i will do my best and i will keep working on it to make it better (and maybe bigger), any suggestion for an improvement or ideas are welcome (sorry if i have a wrong spelt or misused word).

Thanks.

[Kman860]

I'm wondering of you could use that chassis for something else.. That would be great for one of those huge dump trucks people are building lately

[Imanol BB]

maybe i will try to make what you are saying Kman (its a very nice idea), but maybe in other topic, so far i will see if i can do something better for this project.

[Kman860]

maybe i will try to make what you are saying Kman (its a very nice idea), but maybe in other topic, so far i will see if i can do something better for this project.

maybe i will try to make what you are saying Kman (its a very nice idea), but maybe in other topic, so far i will see if i can do something better for this project.

If you use it on a truck let me know :)

[dr_spock]

That looks like a good starting point for one of those rubber tired trains like the Paris or Montreal Metro.

Edited October 17, 2015 by dr_spock

[Imanol BB]

thanks dr spock, i didnt knew about them, now i have a clear idea of what i should change or improve.

EDIT: some advances with the drivetrain idea:

Edited October 17, 2015 by ImanolBB

[Kman860]

thanks dr spock, i didnt knew about them, now i have a clear idea of what i should change or improve.

EDIT: some advances with the drivetrain idea:

How is steering done now?

[Imanol BB]

it should work with a servo, i will see if i can make it, but maybe i will just put a M motor and worm gears to steer the turntables.

EDIT: a first experiment.

Edited October 17, 2015 by ImanolBB

[Kman860]

Oh I see now :) looking good

[Imanol BB]

right now i think i finished the drivetrain and the steering system, maybe it need some improvements:

[rollermonkey]

Um, why have powered steering on something that runs on tracks?

[aminnich]

Um, why have powered steering on something that runs on tracks?

I was just going to say that. If the train is running on tracks, their is no need for a steering system.

[rollermonkey]

Even if you are making a train that won't have true rails, those rubber trains still operate in guideways where it seems, based on rub marks, that simple side-force turns the bogies. It would certainly simplify your design requirements.

[Imanol BB]

The main idea its to have a fully working lego technic train, i wanted to make it to work without rails (because it would be to hard to make or buy them), it would work like a crane like movement.

i decided to make it without rails, but they can be made, it is just that i didnt like that it wouldnt have more functions than normal trains, also, imagine how big the rails should be for the size of this train.

Edited October 17, 2015 by ImanolBB