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A new type of movement
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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cool idea, although i get the idea that it would slow down the bot beacuse you wouldnt be able to spin on the spot very easily and there would be more friction, omni wheels can only go forwards and sideways. that is a problem with a lot of omni bots (exept for the mechanum wheels) more friction is created with the different wheel positions. even though might be the case, straifing can be invaluable, i would sacrafice a little speed for straifing anyday.

Post Tue Jun 07, 2005 8:59 pm 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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does anybody have any idea to what i could use for the ball.
Confused

i would like them to be 6 to 10cm in size, be fairly light and must be able to take a bit of punishment. dont worry about grip although that would help, i will probably be attatching rubber onto it from a car tyre inner tube.

Post Wed Jun 08, 2005 9:07 pm 
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prong
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Joined: 19 Jun 2004
Posts: 839


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hmmm, well not too sure. Would be nice to be able to machine one up!

failing that you can buy styrofoam balls from craft shops, you could then use that as a base to coat it with soemthing to make it strong. Possibly also you could track down a wooden ball at a craft type shop, or a garden centre....

Post Wed Jun 08, 2005 9:22 pm 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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yeah i had the idea of a styrofoam ball, but i dont know of any resins that
or glues that might do the job, but i have no idea.

Post Wed Jun 08, 2005 9:32 pm 
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kkeerroo
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Joined: 17 Jun 2004
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Location: Brisbane


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Skin a tennis ball. Very Happy
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Post Thu Jun 09, 2005 7:39 am 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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the tennis ball might work as a temp fix though i dont think that its strong enough. i might give it ago if i cant find something else.

Post Thu Jun 09, 2005 3:10 pm 
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prong
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Joined: 19 Jun 2004
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you could try filling the tennis ball with that expanding builders foam stuff, that would make it pretty strong. Or if you wanted a bigger ball you could buy one of those little kiddy balls and fill it.

Post Thu Jun 09, 2005 4:17 pm 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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sounds better than using a strait tennis ball, any undercutter would destroy all control that you once ha, thy split to easily normally. sounds the cheapest option yet.

Post Thu Jun 09, 2005 9:44 pm 
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Giant Robo
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Joined: 17 Jun 2004
Posts: 583
Location: Marayong NSW


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Billiard balls?

Post Fri Jun 10, 2005 2:22 am 
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dyrodium
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Joined: 24 Aug 2004
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Location: Sydney


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Arn't they glass? Sad smash....
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Post Fri Jun 10, 2005 11:49 am 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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i did also say i wanted one that is light.

Post Fri Jun 10, 2005 8:31 pm 
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Glen
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Joined: 16 Jun 2004
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you could cast them from solid epoxy. that wouldnt work too bad. although no idea how you would get the mould of a solid ball.

your best bet would more than likely be to just get a big ball castor and rip the steel ball out of it. ive also seen big rubber castors that have large ball wheels on them. there maybe 50-60mm diameter.
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Post Fri Jun 10, 2005 8:42 pm 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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the epoxy idea i have been toying with, but if i would make it i would get a hockey ball(grass) make a cast out of clay. when that sets make 2 hollow halves out of the mould like they make easter eggs by hand (if you dont know, they get the runny chocolate and coat the inside making thin layers until it is thick enough.) then i would glue the two halves together Very Happy .

Post Fri Jun 10, 2005 9:02 pm 
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Glen
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ah the trusty hockey ball, would be a good item to use in itself if it wherent for the weight. (i should know ive been smacked in the head with one lol).
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Post Fri Jun 10, 2005 9:06 pm 
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muzzoid



Joined: 04 Apr 2005
Posts: 42
Location: ballina N.S.W


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hmmmmmm, maybe i could hacksaw one in half and take out the innards, glue her back together.

Post Fri Jun 10, 2005 9:11 pm 
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