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 21:58:30 GMT
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Original-From:
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The WordMeister <dwilcox@wordsmithdigital.NOMORESPAMcom>
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Viewed:
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452 times
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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 has 1 Reply:
 | | 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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