Subject:
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Re: Back wheel construction advice
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 16 Mar 2003 21:18:11 GMT
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Original-From:
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Vance P. Frickey <vfrickey@ricochet.com=ihatespam=>
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Viewed:
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704 times
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How big is the robot? If we're talking -Lego scale, maybe an actual ball
mouse would be an answer - you can get very small ones meant to be used with
laptops.
Think about it - you're in the right approximate size range AND you get
accurate 2-axis motion encoding in a TINY package, axles, encoders,
everything appropriately placed, in the bargain.
A Dremel or other similar grinding tool should suffice to pare away unwanted
parts of the mouse's case to save weight and space. Most mice I have
disassembled have a DIP header or similar connector allowing quick
disconnect of the mouse cord from the circuit board, so a prototyper's work
is almost all done from that perspective - just supply +5V from your robot's
main board to excite the optical encoders, bring the output lines out to
your main board, and there... you... are.
If you need a bigger "caster" you could do worse than scale up the innards
of a mouse to give you the same 2-axis motion encoding capability - make
that caster pull its weight!
----- Original Message -----
From: "Russ Sprouse" <russprouse@adelphia.net>
To: <lego-robotics@crynwr.com>
Sent: Sunday, March 16, 2003 6:20 AM
Subject: RE: Back wheel construction advice
> I have found myself needing a similar freely-rotating wheel, and have had
> only marginal success with a caster type of arrangement. I've been
> daydreaming about a ball bearing arrangement (think of a mouse ball) but
> this would probably take us out of the Lego-only realm. I'm not a purist,
> and could live with that, but would prefer a Lego solution. Does anyone
> have a good idea, Lego or non-Lego?
>
> -- Russ
>
> -----Original Message-----
> From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com]On Behalf
> Of Teoman Naskali
> Sent: Friday, March 14, 2003 1:37 AM
> To: lugnet.robotics@lugnet.com
> Subject: Back wheel construction advice
>
>
> Does anybody have any good construction ideas for the back wheel of a 3
> wheeled robot, the wheel is mainly for balance, and it will have to rotate
> freely, the front wheels have separate motors so the back wheel is • dragged,
> the robot can rotate whithout moving forward.
>
> thanks for any advice
>
> Teoman Naskali
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Message has 1 Reply:
 | | Re: Back wheel construction advice
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| (...) I disagree. Look more carefully at your mouse. It's weight (and the weight of your hand) is supported by the little plastic feet. The ball rolls on the desktop but it doesn't support any weight. ---...--- Steve Baker ---...--- HomeEmail: (...) (22 years ago, 16-Mar-03, to lugnet.robotics)
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Message is in Reply To:
| | RE: Back wheel construction advice
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| I have found myself needing a similar freely-rotating wheel, and have had only marginal success with a caster type of arrangement. I've been daydreaming about a ball bearing arrangement (think of a mouse ball) but this would probably take us out of (...) (22 years ago, 16-Mar-03, to lugnet.robotics)
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