Subject:
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Re: Casters
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 23 Aug 2000 02:15:41 GMT
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Viewed:
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781 times
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Something else to think about is what racers call "unsprung weight." This
is basically the weight of the car that is attached to the springs (the part
that sits on the road and is connected to the car using springs/suspension
components). You want to have as little unsprung weight as possible.
In this case, your pictures show that (IMHO) you've "over engineered" the
caster tremendously. Get rid of about half of those pieces. It looks to me
like you could easily get rid of one side of the caster structure. Reduce
the unspring weight and I bet it'll rotate faster.
I typically use a -- I don't know the "official" names, so here's what they
are to me -- a 2x2 plate with a rotating top and an airplane landing wheel
(a wheel under a 2x2 plate that is offset (to provide for the caster part)
as my caster wheel. It's about as small and light as you can get.
--
Mike Faunce
mike at faunce dot com
LUGNET #96
"Greg Betzel" <kelleysoft@pressenter.com> wrote in message
news:l03130300b5c8b79a9c18@[209.224.32.251]...
> > Very interesting ... this is the opposite of what I would think, but • it'll
> > give me something to play with tomorrow. So, shortening the wheel base • might
> > improve caster performance.
> >
> > Maybe I'll just take the kids to Wal*Mart and play with the shopping • carts,
> > seeing which combination of forward/backward and pushing/pulling seems to
> > work best.
>
> Interesting problem! Be careful with the shopping carts though...the
> wobbly wheel might skew your tests (every cart has at least one bad
> wheel!), and the clerks might wonder why you're pushing a cart around
> backwards. :)
>
> Seriously, it might everything to do with geometry, namely in the way the
> casters get loaded (the robot's center of gravity, the "caster" of the
> weight on the, um, casters, etc etc). Moving them in or out, even by a
> little bit, might make all the difference.
>
> Just an informed guess here, too...
>
> Greg Betzel
>
>
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Message is in Reply To:
 | | RE: Casters
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| (...) Interesting problem! Be careful with the shopping carts though...the wobbly wheel might skew your tests (every cart has at least one bad wheel!), and the clerks might wonder why you're pushing a cart around backwards. :) Seriously, it might (...) (24 years ago, 22-Aug-00, to lugnet.robotics)
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