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There I've done it I have decided to combine the idea of a promotional fun robot with my intention of one day making a walker!! :uhoh: :uhoh:
Now all I have to do is design and build it. :shock: :shock: :shock:
My intention is to go for an eight legged arachnid type robot. I have seen one at the robot rumble and loved it.
Can anyone think of any other robots like that? :idea: :idea:
Mechadon:
How the heck did that thing work?? :shock:
Hi craig
I built ARAC 2 the spider bot you are refering to at the Brentwood rumble...
Get in touch and ill see if i can help ya..
Cheers Froggy :mrgreen:
Those walkers you have got to be impressed!!
The one I am making wont be a combat one as I don't think I could make one strong enough
The mechanism I hope to use will look like this.
http://www.youtube.com/watch?v=JoQj-...eature=related
that things got little wheels on its claws , If it had wheels which locked up going one way , so it could sort of shuffle about , does it still count as a walker ?
Can someone ask Edd Wallis to email me @ craigcolliass(at)dsl1.co.uk thanks.
Hi Craig
This is the link you need...http://www.mechanicalspider.com/
WARNING !!! building this type of mechanism can send you crazy !!!
I should know ive done it twice now !!!
Cheers Froggy :mrgreen:
this thing is just asking to be made into a heavy weight , theres some really in depth instructions there , and the thing uses wheel chair motors as is !!
http://www.instructables.com/id/Hexabot ... ged_robot/
Mecadon
http://homepage.mac.com/roninsfx/Team_S ... ter16.html
http://www.youtube.com/watch?v=El8ne4zSCY0
Some little kits http://www.hexapodrobot.com/index.html , really nice bloke met him at space centre and Dublin, hes planning on making a big version i think.
lynxmotion sell something similar to this , they look fantastic but they are really expensive.
http://www.youtube.com/watch?v=c1YMQQ8ySXM
I just won an auction on eBay for a pair of 24v-geared motors. They should do for the power they are rated at 300rpm but they will be connected via chain so a speed of no more than 95rpm at the cranks.
I am not sure of the stride length but I hope it will be approximately 200-250mm, giving a theoretical speed of 1.1-1.4kmh this will be quite fast for a walker!!!
I love the robots shown on this thread by other people, if all goes well I hope to have some component pictures up in the next few weeks.
Thanks for everyone€™s input.
cool , id love to see the results , are you using the wheel -less bicycle design ?
If you could imagine 2 of them stuck side by side to give an 8-legged version this way I hope to be able to steer it. :idea:
Also I hope to place some sort of device either a screen or billboard for advertising on top between the leg mechanisms,
I will probably have to put polycarbonate panels over the side to prevent fingers getting trapped.
But first thing is getting the bits and then make the thing work. :uhoh: :uhoh:
Go on Craig, you know you want to build it like this......
http://www.youtube.com/watch?v=40debSRrAOw
Too scary I would rather build this
http://www.youtube.com/watch?v=49dko...om=PL&index=30
all this talk of walkers and all the videos is tempting me to make a feather walker im gonna have to stop looking at this thred
that video kcr posted looks quite a bit like what you described craig
Hello everyone, 'tis my first post.
I may be wrong, but I'm not sure that using an exceptionally clever linkage like a Klann or Jansen (http://www.mechanicalspider.com/comparison.html)to convert continous rotary motion of a motor to movement of a step counts as a walker.
I have always thought a true walker to have to use the drive motor to reverse the legs direction i.e. using pneumatics, hydraulics, linear actuators or servo motors being moved backwards and forewards in a specific order to make the robot walk.
To me, a linkage is an overcomplicated shuffler. However, as yours is only a promotional bot then you have no need to worry about whether you will be allowed the extra weight allowance (unless you want to fight with it.)
If you're interested in wanting to build a true walking robot then I have a two designs, one hexapod and another quadrapod on Incredibots (http://incredibots.com/). Unfortunately, their servers are down at the moment so I can't post the bot. However, when they do come back online i'll post them and you all can have a look.
On a final note, I suggest using Incredibots in modelling linkages etc. as it's very good at that (I'm pretty sure I saw a spider using either a Klann or Jansen linkage on there.)
Just my 2p (more like 10) on walking robots.
The Incredibots servers are back up now so I can give you a link to my walking machines.
Quadrapod: http://incredibots.com/?robotID=dali...31c04.54213413
Hexapod: http://incredibots.com/?robotID=dali...b3a39.03183432
Both only need four motors to move and they would both use the same walk cycle programme (see instructions in game.) If you look at one side of the walk cycle for the hexapod (red or blue legs) then you can sort of see how it would turn using normal tank steering. Invertability is relatively simple with the hexapod, just extend the legs out the top.
The Quadrapod one is only one side of it and two of those would be needed for tank steering. I believe it to be a more solid machine with more grip, however, it would be far more difficult to make it invertible without complicated shafts that go through one another (at the moment I would be placing motors on top of the leg.)
I hope you enjoy my long, ever so slightly mad ramblings about walking robots.
JB
Hi Jordan welcome to the forum
I just went to the rules on building a fighting robot, and for walkers there are only two entries.
The first about Weight limits
2.2
Legged robots (walkers) can weigh up to twice the specified weight in all classes. A walker must employ moveable legs to support its weight. Robots with rolling or sliding mechanisms will not be classified as walkers.
And the second about drive definitions
3.1.1.
Rolling (wheels or the whole robot)
3.1.2.
Walking (linear actuated legs)
3.1.3.
Shuffling (rotational cam operated legs)
As you can see any robot that is held up on its legs, and moves as a result of their linear motion (that is not rotational eg camshaft, or in other words it is not a wheel with legs sticking out of it) is a walker by these rules. :shock:
None of this matters because as you say my robot won't be used for combat but I would love to see a feather walker it would be good fun for the crowed to watch but I don€™t see it as being competitive. even if it did weigh 27.2kg!!
Still that€™s never stopped me before!! :mrgreen: :mrgreen: :mrgreen:
As promised some photos
http://s569.photobucket.com/albums/ss13 ... GA5007.jpg
http://s569.photobucket.com/albums/ss13 ... GA5005.jpg
http://s569.photobucket.com/albums/ss13 ... GA5004.jpg
http://s569.photobucket.com/albums/ss13 ... GA5006.jpg
http://s569.photobucket.com/albums/ss13 ... GA5003.jpg
The legs are cut from 6mm thick aluminium plate the links between the bell crank parts will be doubled up to help strengthen the legs. the long links go to the crank.
The next jos is to make up the Oilon bearings and washers for the link joints!
Made 36 thrust washers from 3.2mm nylon only 134 more to go :(
Started fixing the transmision shaft bearings to the first pod, I have decided to go for a reduction gearbox with the motor, and a two stage reduction chain drive, with a friction torque limiter, this should give a reduction ratio of around 100:1. Final drive 17mm silver steel shaft for the cranks to be fitted on. :D
this looks fantastic :)
I thought you might like to see the first mock-up of one of the legs sorry the picture is 90 deg out!!
http://www.youtube.com/watch?v=VfD7tbUI3rk
Looks very good Craig, I can see it looking quite impressive when all the legs are going at once :)
Just an idea for shoes, two blocks of wood (in the shape of the shoe) on either side of the leg bolted together through the metal. Glue some strips of rubber on the bottom of them for grip or just cut the ends of the wooden blocks to be textured. What you do with the bottom of the feet really depends on what the robot will be walking on. Really smooth (like a wooden floor), use the rubber. Reasonably rough (like a playground), go for wood.
Looking really good.
I have decided to call the robot The Pilgrim, after all what else would you call a walking Saint!! :D :D
This video is probably the closest thing to what i hope to make but my one will be much bigger. :D
http://www.youtube.com/watch?v=HrVAE...eature=related
thats electro luminiscent wire (EL wire :)) it requirs about 2.5 KV input to work , but inverters are available , i think maplins sell it if you are after some , most people use it in custom pc cases :)
That is awesome, if you can make it anything like that Craig, it will be a big hit and I€™m sure you will!
Stu- you want that music for RR!
Tom
Hi all
this is a picture of the drive pods the motors are in and the transmision is going ok. the walking pace will be about 42 per minute, I have had the leg bushes machined up they are made from Oilon oil impregnated nylon.
http://s569.photobucket.com/albums/ss13 ... GA5024.jpg
OOps it is a bit big!!!
Next to the dustbin you get an idea on how big the walker is going to be, it is about 1.5mtrs long and just under 1mtr high at the moment but finnished it will stand just over 1 mtr tall. :proud:
http://s569.photobucket.com/albums/ss13 ... GA5030.jpg
I hope i can get it in the van :uhoh: :uhoh:
That thing is huge !
Hope the rest goes just as well.
Some pictures so far on the walker
I now have 4 legs sub assemblies so when the support brackets are finished I will be able to dummy up the first pod to see if it actually walks!!
Also I have dug out some 12 amp/hr batteries for the power, I will probably have one battery in each pod with connecting wires between them.
http://s569.photobucket.com/albums/ss13 ... GA5034.jpg
Anyone want a go at making this type of walker?
http://www.youtube.com/watch?v=RI8VD...c-HM-fresh+div
[quote=craig_colliass]Anyone want a go at making this type of walker?
http://www.youtube.com/watch?v=RI8VD...c-HM-fresh+div
Jordan
It might be a bit hard if you want to make that walking robot out of Lego try this type.
http://www.youtube.com/watch?v=MqIehwrnF5E