My first robot : a quadruped with 3 DOF by leg

It just trying to walk correctly for the moment :)

Update 2 : new video of the "spider style" walk

Hi everybody my name is MoX First i want to say sorry for my english : I'm French ...(and sorry for my president

So this is my first robot, a quadruped with 12 standard servomotors and 3 dof by leg.

I make all the part myself with aluminum plate.

For now, it's just control by my computer link to it with a RS232 connection, and a SSC32 controlling servomotor card by Lynxmotion (a real good card i think :)

Today I'm trying to control it with an Arduino car but the com with UART between the two cards is not operational for the moment :( I'm also trying to include a URM37 ultrasound sensor :)

The first step was to create a second axis for all servos.

I used some support of roller-blade ball-bearing, and I stuck it to the servo with cyanoacrylate adhesive :

Now , let's use my best enemies (which offer me a lot of blister ! ) :  Saw, file, and tech vice (lol not the same signification in French MDR)

The body :  PVC plate (dimensions 180x180mm,5mm of thickness) :

Now the legs : I am going to use the terms of "shoulder", "leg" and "scratch" for the 3 parts of the legs... (sorry I know that my english vocabulary have to increase .....)

All the aluminum parts are from an old 19" computers rack ( 2mm of thickness )

First type of servos support : for the 2 servos of the "shoulder"

I have fold the plate following the dotted line, using a tech vice :

It's very important to align correctly the axis of the servo with it's new axis (the bearing part)  and to follow this alignment with the aluminum support of servomotor. Personally it's not perfect (i wish i had a numeric CNC :) future project ?!

when you love, you don't count (French proverb) 3 more to make ... or you could count your blisters LOL : 600W blister by hand !! thank you Miss metal file ! ........ heuuuu if you don't understand the blister thing....just French technical joke LOL

And the result with servos , but not yet fix to them ( one of them is on the "leg")

The result with the 4 supports of "shoulders":


Now the support for the "leg" : more simple than the other LOL ...... but... but's just a poor piece of aluminum ?? ... YES o_O

The leg:

The result with 4 legs :

Now my favorite part : the scratch:

Same idea : Saw, file, and tech vice ...and blisters !

Result :



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thanks dude :)

I'm still working on the software, improving the way to walk (more smooth...)

But I'm working on a biped now , so my poor quadruped is a little jealous :) lol 

A take a lot of photos of my biped and i will post them soon :)


I think you can modified it into this:

yes but I'm busy the weekend .. too bad ..MDR

... and very smooth motion !

Did you use a kit to build the chassis or is it 100% homemade ?


An other frenchy ;)

Salut LordGG

Le chassis est 100% homemade, réalisé avec des plaques d'alu de 2mm d'épaisseur (récup de rack info de 19") (bon en fait quand on regarde bien les axes pas vraiment en face .... :( on sens bien les coups de scie à métaux et la lime à s'en faire de ampoules :)

Si ça te botte j'ai plein de photos des différentes étapes ....

bon délirs robotique l'ami


Hi LordGG

The frame is 100% homemade, I build it with aluminum plates of 2mm of thickness.

It's a salvaged materials of a 19" computers rack.

Good luck with your robot :)

... carrément, ça m'intéresse de voir tout le processus de fabrication ! En tout cas bravo, le résultat fait vraiment très pro ! :)

I look forward to see the pictures, I hope you will post them as lumi suggested you, I think many of us will be interrested.

Et j'ai hâte de voir la bestiole devenir autonome ;)

Have fun !

Cool design, well done.

But please do not send emails with pictures to the guys, just post them here so we all can see the step-by-step development.

thanks man !

You are totally right ....So  I'm going to post pictures of the different steps of the mechanic part ...


Very good description of the progress. Merci!