neat robot design (to copy mercilessly of course)

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Steven Pickles

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May 8, 2013, 9:12:00 PM5/8/13
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Ken

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May 8, 2013, 10:13:25 PM5/8/13
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If you had a need for such a thing, that would be a cheap way to get the platform.  It looks snifty in a cheap plasticy way.
I'm tempted, but I'm supposed to be getting rid of useless stuff at home, not accumulating it.
(And I'm not going to start Android programming at that level.  A "hello world" is more like it for me.)

Ken.


On 9 May 2013 10:42, Steven Pickles <thatp...@gmail.com> wrote:

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Damien P

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May 9, 2013, 5:36:55 AM5/9/13
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On Thursday, May 9, 2013 10:42:00 AM UTC+9:30, pix wrote:

Next group project maybe... build a big one of these with bike wheels.  (Would bike wheels hold their shape without spokes?)

Kim Hawtin

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May 9, 2013, 6:24:04 AM5/9/13
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​it looks like a nice simple platform shape. i'm sure we could knock up something like this that used an arduino and recycle hardware...
i saw it and immediately though 26" mountain bike wheels, granny gopher motor controller, drivetrain and batteries ;)

cheers,

kim

Kim Hawtin

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May 9, 2013, 6:34:01 AM5/9/13
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Damien P <ath...@gmail.com> wrote:
Would bike wheels hold their shape without spokes?

snap!

yes they would if the rim was double walled or heavy enough. however you have to work out some kind of cog/tooth arrangement.

be better off using the axle as a mounting/hanging point and thread up a fixed gear onto a pair of rear hubs. not hard and I've done something similar for a trike years ago =) easy enough to work out the same virtual pivot point where the center of mass is on the robot versus on a bike wheeled version =) Same basic self balancing logic Geoff Bennets Segway clone. Keeping the torque low enough so as not to spin on the spot. University of Adelaide guys have a similar project to carry a person called EDWARD; http://www.youtube.com/watch?v=nNgt-6WgS8Q

cheers,

kim
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"Art without engineering is dreaming; engineering without art is calculating."  --SKR

Matthew Croucher

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May 9, 2013, 8:16:45 AM5/9/13
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Looks like the same mechanics as this Makerbot design on Thingiverse.
Just without the cool rockets:
http://www.thingiverse.com/thing:23688

Steven Pickles

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May 9, 2013, 10:56:06 PM5/9/13
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Between this and the suggested group projects, I sense a frustrated desire to build something BIG.

pix

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Steven Pickles

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May 9, 2013, 10:58:31 PM5/9/13
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Nice find Matt. I'd seen it before but I didn't realise how it actually turned the wheels. I just really like the fact that these design don't need a third idler wheel, like most of the other simple robots.

pix

Damien P

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May 10, 2013, 4:34:27 AM5/10/13
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On Friday, May 10, 2013 12:26:06 PM UTC+9:30, pix wrote:

Between this and the suggested group projects, I sense a frustrated desire to build something BIG.

If it were small, we'd build it ourselves!
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