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# Would it be possible to make a walking 8 legged... thing? Answered

I'd like to make a walking spider, about 30 cm tall, preferably out of metal. It wouldn't even have to go in a perfectly straight line. Ideas?

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yes.

www.lynxmotion.com/Category.aspx has some 6 legged walkers. i remember there being an 8 legged one, but can't seem to find it. you might be able to do it off the servo erector set

Well that's cool.

I heard some where where they made robotic "cockroaches" that worked off a bi-axial principal. while two legs on one side would go down, the middle leg on the other side would be down as well while the rest were up. Each set of three legs would then rotate in a forward motion kind of like a motor with a leg sticking off in one direction from the shaft, so that it will go forward every time the leg kicks off from the ground.

Sound familiar?

it does... the principal being that at any given point 3 legs would be on the ground, forming a triangle. (the minimum number of points to make a stable surface.)

you might be able to modify the idea so that there are 8 legs, and the 2 outer legs on one side, and the 2 inner ones on the other side move at the same time. not a true octapod, but it might work.

or if you do legs 1,3 on one side and 2,4 on the other to do the same.

I haven't a clue here, but I would suggest avoiding overly complicated things like the one I picture below:

I heard some where where they made robotic "cockroaches" that worked off a bi-axial principal. while two legs on one side would go down, the middle leg on the other side would be down as well while the rest were up. Each set of three legs would then rotate in a forward motion kind of like a motor with a leg sticking off in one direction from the shaft, so that it will go forward every time the leg kicks off from the ground.

Sound familiar?

Crabfu steampunk might have one, otherwise there's a mechanical ant somewhere for sale.

I was hoping to make one instead of buy one, but thanks any way.

If you can figure out how you want to make a 4 legged thing walk then it's just the problem of how to add 4 more legs.  You can probably connect them to what ever is moving the first 4 or add another complete unit.

Have you thought out the problem of how to get 4 working yet?  What materials do you want to use and what motor/gear setup are you thinking about?

I heard some where where they made robotic "cockroaches" that worked off a bi-axial principal. while two legs on one side would go down, the middle leg on the other side would be down as well while the rest were up. Each set of three legs would then rotate in a forward motion kind of like a motor with a leg sticking off in one direction from the shaft, so that it will go forward every time the leg kicks off from the ground.

Sound familiar?

It's made out of laminated card, a motor, a battery and a reciever.