Let's Make Robots!

E.I.T. - The way of the Martians (Work in progress)


E.I.T. - Earth Invading Tripod v. 1

"...higher than many houses, striding over the young pine trees, and
smashing them aside in its career; a walking engine of glittering
metal, striding now across the heather; articulate ropes of steel
dangling from it, and the clattering tumult of its passage mingling
with the riot of the thunder."

-- The War of the Worlds by H.G. Wells (1898)

Allways liked those Invading Tripods coming from space bringing chaos and destruction upon earth and mankind.

So want to build a Tripod, it's probaly not going to be the invading, man destroying kind like in The War of the Worlds, but that's definetly my source of inspiration.

At the moment 12 June 2008 I'm laying sick but skecthing how I think the first working model of the Tripod should be, as soon as I get better and get back to my own place I'll upload my sketches and come with some more details.

Did a quick paint drawing of what I hope to end up with in the end or it should be something like that.

EIT_the_goal.jpg

 

 

 

 

 

 

 

 

 

Lego Prototyping

So had to finde out how to build a Tripod which has a good chance of walking, so at the PROSA Robotics meetup on June 18th I build a prototype of how the legs should be positioned and work and thx to the input and help to move around the lego prototype from JKA and Thomas Å, I now have a couple of ideas on how this Tripod could move around.

PIC-0012.jpg

PIC-0013.jpg

PIC-0014.jpg

Tripod Movement

 Have been doing some research/studying of tripod movement, from different movies and animations, and think I have figured out a way to move, working on some sketches of how it should work, will post them as soon as they are finishe, also started to finde materials to build E.I.T v.1 with.

 To be continued ....

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Clever,

I bet it will  do the boogey woogey when it walks by a Tesla coil.

Even this "RoMeLa StriDER" has 4 DOF on each leg!
THAT is a cool project, though! Flipping.. Cool! :D

After having messed about with a biped, I realised I should have started with a hexapod!

Having said that, I really want this to work for you. So I will point out that to a certain extent, taller is better. If it's short, the legs will need to be FAST. Each will need to get up, move and get down again before the bot falls too far. The taller it is, the longer it takes to start to fall, so the slower the legs can be.

If we assume that the leg which is about to leave the ground is "number 1," I presume you're going to do something clever like shifting the centre of balance over number 2 and 3 before number 1 leaves the ground?

Will it do anything besides not bump into objects? You might want to equip it with a standard laser pointer in honor of the book and movie. :) Just an idea.
 
 
Brennon 

 

“Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us.... -Marianne Williamson

Well my first goal will be to make it walk, when that's done then a lot more fun can begin, but definetly could be cool to add some laser pointers to it or maybe some simple arms or something.

Something made of materials like this

 http://www.eshopmegastore.com/images/flylight3_2.jpg

just hanging from both sides of the head and down with laser pointers, but first things first, something that resemples a Tripod and can walk that's the first goal.

Oh yeah, they're the most lovable machines ever built! Until they're standing over your house! :)
 
If you make it big enough you can have 2 functions per leg: 1 servo controlling overall movement and 1 controlling the movement of the 2nd half to act as a knee. I don't think you'll get the fluid movement seen in the movie or described in your book on the first try, but this will undoubtably be a fun robot!
 
Brennon 

 

“Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us.... -Marianne Williamson

Two servos per leg will definetly be the way to go I think, or else it won't be a real Tripod I think, but yea the fluid motion like in the newer movie would be way out of my league and well the Tripods from the good old movie (my favorite) which uses some kinda electromagnecticfield based legs is definetly totally for the more gifted people to make :)

That got me thinking...  I wonder if memory wire, like Nitinol, could be used?  Apply current and the wire would go limp and become flexible, drop current and the wire would return to it's initial shape and become rigid.  It could provide the very flexible wavy legs like in the movie.  I have no idea how much current is required for the wires to become limp or how much weight the wire could support when rigid.  It may be possible to bind several pieces of wire and have them move in unison.  Maybe the wire could be put inside a flexible piece of rubber, like a marine antenna, to provide more rigidity and weight bearing capability.  Just a thought.

Some Nitinol products:

http://www.imagesco.com/catalog/nitinol/index.html