Subject:
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Re: Web Page Update - new syncro/Lego motor internals
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 15 Nov 1999 22:20:07 GMT
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Original-From:
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Paul Speed <pspeed@SPAMLESSaugustschell.com>
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Viewed:
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755 times
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And,
They are worth every penny and then some if you are making
a synchro 'bot. There are alternatives (differentials being one of
the better) but none of them are very easy. Believe me, I tried for
many months before finally breaking down and buying some turntables.
One word of caution, once you get in the habit of ordering
things from Pitsco, et al. it will be difficult to stop. Scrounging
for change in the couch cushions so that you can score another set
of worm gears is not unheard of. :)
-Paul (pspeed@progeeks.com, http://www.progeeks.com/)
Wes Matchett wrote:
>
> I don't have an alternative, but you can buy two turntables from Pitsco for 9.75
> - a real bargain in my opinion. The cost is actually 15.75 - minimum shipping
> is 6.00.
>
> I bulk up my orders from them to maximize the shipping cost value.
>
> -Wes
>
> The WordMeister wrote:
> >
> > The synchro drive looks amazing, and I mistakenly left a printout of Wes's
> > images where my 4-year-old could find it.
> >
> > I kept banging my head against the wall with my attempts for a reliable
> > rack-and-pinion steering system 'bot, and, as I've already half-dismantled
> > that prototype, thought I might take a breather with a synchro-drive.
> >
> > However, I don't have those big turntables (and can't really blow $30 to $40
> > on them). Has anyone tried a similar mechanism without depending on those? I
> > can _almost_ visualize it, but thought I'd hit the group up for ideas before
> > digging in this evening.
> >
> > --Doug Wilcox
> >
> > -----Original Message-----
> > From: Doug Carlson <dcarlson@net-info.com>
> > To: lego-robotics@crynwr.com <lego-robotics@crynwr.com>
> > Date: Monday, November 15, 1999 4:49 PM
> > Subject: Re: Web Page Update - new syncro/Lego motor internals
> >
> > > Wes,
> > >
> > > You can add me to the list of impressed synchro enthusiasts! :-)
> > > Very nice design.
> > > Your compact design inspired me also...
> > > So, I went off and found another suitable tire for the small wheel hubs.
> > > It's actually two smaller o-rings and a larger one offset to one side.
> > > (small o-rings are size 014 : 1/16" width, 1/2" ID, 5/8" OD
> > > and the large one is size 114 : 3/32" width, 5/8" ID, 13/16" OD )
> > > Placing the large o-ring closest to the inside edge of the wheel hub • preserves
> > > the 1:1 ratio of wheel radius to wheel offset from center of the turntable.
> > >
> > > A picture of this 'tire' is at :
> > > http://www.net-info.com/~dcarlson/images/synwheel.jpg
> > >
> > > BTW, I only use one wheel per turntable because it enables the bot to
> > > change directions without
> > > altering it's locatation or direction due to wheel scrub.
> > > And keeping the wheel radius and offset equal reduces errors even more.
> > > Of course, this is only if the bot doesn't tip over. ;-)
> > >
> > > -- Doug
> > >
> > >
> > >
> > >
> > >
> > > Doug Carlson
> > > dcarlson@net-info.com
> > > http://www.net-info.com/~dcarlson
> > >
> > >
> > >
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Message is in Reply To:
 | | Re: Web Page Update - new syncro/Lego motor internals
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| I don't have an alternative, but you can buy two turntables from Pitsco for 9.75 - a real bargain in my opinion. The cost is actually 15.75 - minimum shipping is 6.00. I bulk up my orders from them to maximize the shipping cost value. -Wes (...) (25 years ago, 15-Nov-99, to lugnet.robotics)
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