Let's Make Robots!

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

Zalzer's picture

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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myblack60impala's picture

Its been a long time. Did you finish this project?

We (LMR) sure would like to see it running around!

Just make it walk using Lego's, if you haven't finished it.

 

Be motivated!!!

jip's picture

Oh no, you should NEVER have showed me that prototype in lego! Now you made me want to build a tripod in lego as well :-). Anybody up for tripod racing? :-D

I'm looking forward to seeing this in action!

And remember... a tripod is only half a hexapod... so it must be half as hard to do as a hexapod, no? ;-)

Zalzer's picture

Definetly up for a Tripod race when E.I.T v.1 is build and able to walk.

Could be interesting to build one in LEGO, but I would not advice using mindstorm as brain it's to heavy and you limited by how many motors you can use, and the motors are too clumsy

jip's picture

But but but... I want to build it in lego! :-D.

No I guess using standard servo motors would be much easier since the lego "servo" motors are not really servo motors but rather dc motors with encoders. It would be a pain to do the book keeping on the encoders if I was not to use the NXT brick for brains. Also it would be kind of expensive to get all the lego motors anyway :-)

Anyway... I have another lego project going on right now (where I'm actually going to go through the pain of book keeping of the encoders), so tripod will have to wait :-)

BTW. you do know that the NXT can talk to I2C devices, right? It's no so limited as many people think and it could easily control as many motors as you'd like it to given you build some extra I2C motor controller with additional power.

Cheers

BaseOverApex's picture
I can see it, but I just don't see how you're going to left a leg to move it.
Zalzer's picture
Lifting the legs without the whole thing falling is definetly the most tricky part of this Robot, but as written have some ideas, I'll try and see if I can skeetch them og simulate them somehow, maybe I can build a virtual prototype in Garry's Mod a Source Engine Game, but could be realy hard but have seen people do more tricky things with that game
Krumlink's picture
fritsl's picture

Boy - this is your first robot.. you cannot do it :) It is a VERY hard task.

Perhaps give it wheels on each leg, and a propeller :D

(sorry, but someone had to be honest and direct - for your own sake - make an easy robot first time - at least a hexa, not a tri!) 

jklug80's picture
I agree. The huge problem with a tri is shifting weight so it doesnt fall over when it is only on two legs. Start off with a few more legs and it will be easier. When it works take off a leg and get it working...
fritsl's picture

LOL! Yeah, that may just be a good aproach; Start with 8 legs. and then take off one leg at a time :D:D:D

 Zalz; Anything less than 6 legs that is walking is hard, because you will need to balance. This is why hexa's are popular; You can rest on 3 legs, move 3..