Let's Make Robots!

Bigger version of the DAGU 6wd Wild thumper

Hello i am thinking of building a bigger version of the dagu 6wd wild thumper. a big one that can tow and go over larger obstacles much like the smaller current one. The motors i have selected to use are winshield wiper motors and will be powered by either a custom build lithium polymer battery pack (putting a bunch of  3 cell 2200mah batteries in parallel) or a car battery. I would probably go for the lithium polymer as they have a greater energy density.

 

What inspired me

http://www.superdroidrobots.com/shop/item.aspx?itemid=1234

and ofcourse 

http://www.pololu.com/picture/view/0J2312

Now the only problem would be implementing a suspension system. Any ideas? Thank you

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
OddBot's picture

What do you mean when you say "it can tow"?

Normal wiper motors probably won't be good enough unless they have all metal gears.

You might find you need wiper motors from a bus or truck. They are 24V but they are much stronger with HD metal gears. I have one with a 50Kg/cm output.

tawanda's picture

I am meaning that it can pull small trailers e.g for use on a small farm. I currently have wiper motors that i removed from nissan pulsars a while ago that i want to put in place. Yeah i agree that metal ones will be more suitable however on a previous project i was able to tow a 75kg Bbq stand with two wiper motors with no problem. i will see how these can cope but im not expecting too much.

Thanks Oddbot! 

birdmun's picture

I have come to the conclusion a plate, that will mount the motor, could have any manner of suspension added to it. I don't know what kind of horizontal/vertical force the wiper motors could put up with. You might really require some creative shock absorbtion.

I was using the following for reference

And, this is what I came up with:

Anything beyond that is on you. :)

tawanda's picture

That could actually work! i will start experiementing with this idea with some heavy duty torsion springs Decemberish as i have final year exams to study for.  Thanks for your help

birdmun's picture

I didn't mean to make it seem like I slaved over anything. It was more, I suppose, condemning the fact that after an hour of fumbling around, the best I could come up with was a plate to mount the motor and suspension to.