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 22:12:12 GMT
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Viewed:
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551 times
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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
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 has 1 Reply:
 | | Re: Web Page Update - new syncro/Lego motor internals
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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 (...) (25 years ago, 15-Nov-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Web Page Update - new syncro/Lego motor internals
|
| 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 (...) (25 years ago, 15-Nov-99, to lugnet.robotics)
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