Author Topic: can anyone design me a perfect body for a hexpod (Read 4367 times)

diablocyrus · « **on:** June 27, 2009, 09:59:37 AM »

well i have built a spider bot by buying one body and integrating ultrasonic obstacle detection

but now i want to make a hexpod

actually with strong materials prefarably metals

can anybody give me some design with dimensions

my plan is to have 3 motors per leg

2 motors used for up down of the two parts of leg

and third one for the forward and backward motion

well i have a crazy idea to include another motor per leg with tyres on the second part of the leg

that is whenever needed the robot can bend its legs and make the wheels touck the ground and move like a car in speed

a type of transformer

plus

even if the hexpod falls down it can get up on its own by rotating its legs to the opposite direction

i want to mount a camera and a powerful battery to it

what do u think

jamort · « **Reply #1 on:** June 27, 2009, 01:35:47 PM »

you've built a spider bot but you need somebody to design this for you

HINT: there really never is a "perfect" design it works or it doesnt

SmAsH · « **Reply #2 on:** June 27, 2009, 04:03:42 PM »

why not buy a kit? or just a hexapod chassis?
google for hexapod and look at other peoples designs.

jamort · « **Reply #3 on:** June 27, 2009, 04:26:17 PM »

i think robotshop.ca has a hexapod chassis atleast

SmAsH · « **Reply #4 on:** June 27, 2009, 04:29:51 PM »

a lot of places do, but some are very expensive so look around.

Admin · « **Reply #5 on:** June 27, 2009, 09:48:30 PM »

If a hexapod kit is what you want, try http://www.lynxmotion.com or http://www.trossenrobotics.com

diablocyrus · « **Reply #6 on:** June 28, 2009, 01:10:04 AM »

well

i think none understood that

i have to make a hexpod that can TRANSFORM into a car with 4 wheels for speedy movements

so this one has to be have atleast 3 degrees of freedom

and it should be able to support the load of the power supply
and a wifi camera -3.5 kgs

i also plan on to give two gripping hands

i can never make it work with a robo kit

is there any software with which i can design the body kit

SmAsH · « **Reply #7 on:** June 28, 2009, 01:43:49 AM »

Quote

is there any software with which i can design the body kit

yep, cad. computer aided design/drawing. check out google sketchup.

what experience do you have?

jamort · « **Reply #8 on:** June 28, 2009, 10:33:32 AM »

whats the point of making it have to switch? thats going to be a royal pain in the... to build...
but heres the way id do it... it wouldnt transform id have wheels on one side and the hexapod on the other then have some type of mechanism to flip the robot...

madchimp · « **Reply #9 on:** June 29, 2009, 04:08:33 AM »

why have the wheels on the legs at all just have a pair of wheels that lower in the rear and a set of casters that lower in the front then you can start with a hexapod kit and just modify it to have the wheels and casters that lower

jamort · « **Reply #10 on:** June 29, 2009, 04:33:47 AM »

I think that it would be easier to design a flip mechanism.... and maybe trackson the other side even better (if thats an option)

SmAsH · « **Reply #11 on:** June 29, 2009, 05:45:59 AM »

what about wheels on the underside of the robot and the legs just lift off the ground when it needs to go?

Metal Slug 2 · « **Reply #12 on:** June 29, 2009, 06:16:06 AM »

I googled "hexapod with wheels" for you and found this: http://www.lynxmotion.net/viewtopic.php?p=51733&sid=5d0c84843eda3522c2f73747ee144fcd
From the design IMO the transition between legs and wheels would be quick and effortless. It may not be suited for what you have in mind however, because you want the wheels on the legs and the capability of moving while flipped over right?

There is also this idea, not exactly a hexapod, but it might inspire you: http://hackedgadgets.com/2009/05/08/halluc-walking-and-rolling-robot/

SmAsH · « **Reply #13 on:** June 29, 2009, 06:22:20 AM »

that last ones a good idea, just have the drive motor apply an electrical brake when it wants to walk!
but the first one is an ingenious idea, thats what i was thinking...

Canabots · « **Reply #14 on:** June 29, 2009, 10:02:00 AM »

Hmmm...this is a quadruped, but it doesn't mean you can't add 2 more legs

Quadruped Robot

Also, don't forget the power requirements for the robot. 18 servos, that's alot. And they will likely be running continuously, even in wheeled mode, since they have to retain their position. Also, in wheeled position, you're robot will take up more power, since 4 motors are being driven aswell as the servos...but I think a few extra battery packs should do it ^_^

Good Luck!

SmAsH · « **Reply #15 on:** June 29, 2009, 03:56:27 PM »

wow, that little guys so fast!
i cant believe he got up that ledge so easily!

diablocyrus · « **Reply #16 on:** June 30, 2009, 12:25:36 PM »

OH MAN

SO COOOOOOOOOOOOOOOOOOOOOL

thats what i am talking about

could u give some more details about that quadrapod

how does it senses that obstacle

and how does it uses its legs for that stepping motion around an obstacle

i guess that it have 4 degrees of freedom

Metal Slug 2 · « **Reply #17 on:** June 30, 2009, 04:47:00 PM »

Quote from: diablocyrus on June 30, 2009, 12:25:36 PM

i guess that it have 4 degrees of freedom

Your thinking makes sense, but *I think* each leg actually has 4 degrees of freedom (of you include the servo with the wheel part), so the quadruped actually has 16 degrees of freedom.

Based on the video, it seems that when the quadruped encounteres an obsticle, it raises the front of its body to a certain degree, and it seems an IR rangefinder then senses if the robot can "look" over the edge of the object. If it can "see" over an object, it attempts to climb over it. In the video you see it spproach a wall, it angles itself upward, but when it does not sense that it can see past the object, it turns around and goes a different direction. When it encountered the small conatainer, it climbed over it. But then again, it may have been remotely controlled via the GPS feature unless it was programmed to turn and drive down the ramp after climbing up the container...

diablocyrus · « **Reply #18 on:** June 30, 2009, 07:00:38 PM »

which is the cheapest way to make a gps simple enough to map the entire thing stored in some memory onboard the device rather than on a pc during the first run then using it for further automated motion

and how does it rotate the front legs in the wheel mode

i see only one tire

?

can anyone give me a sketch of how its legs are designed just want to be sure

Metal Slug 2 · « **Reply #19 on:** June 30, 2009, 09:21:22 PM »

If you look closely (from the vid.) you will see that each leg has a wheel, and attached to that wheel there is a small servo. The quadruped also uses the wheels as "feet" when in walking mode.

diablocyrus · « **Reply #20 on:** July 01, 2009, 12:41:33 PM »

thanks a lot guys

but could anyone draw one of the legs from the quadrapod legs in the videofor me in autocad

i would like to make them

SmAsH · « **Reply #21 on:** July 01, 2009, 02:28:43 PM »

it can rotate the wheels the same way it moves the legs forwards...
but it cannot "rotate" them while they're stationary.

diablocyrus · « **Reply #22 on:** July 02, 2009, 11:13:58 AM »

hello everyone

could someone draw one of the limbs of the leg wheel hybrid quadruped robot from the video for me

i dont know how to design mechanical section

please

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Author Topic: can anyone design me a perfect body for a hexpod (Read 4367 times)