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 18:19:52 GMT
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Viewed:
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640 times
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Paul Speed wrote:
>
> Bah,
>
> And I thought mine was small. Compared to yours, mine is a
> big hulking behemoth. :) (I know Wes in real life so I can only hope
> that maybe he was somewhat inspired by my design. ;) ) My linkage
> is completely different and not nearly as clever (although I _thought_
> it was pretty clever), but it does fit within the turn tables like
> yours.
Yes indeed Paul, your model did provide some inspiration. For others reading
this group... Paul introduced me to technics about 4 years ago when he showed
me a pair of Star Wars AT-AT style legs he had designed. Its good for the
creative juices to have other enthusiasts around to bounce ideas off of. That
is what makes lugnet so valuable - it increases the enthusiastic community
beyond my geographic location.
> Anyway, in mirroring the left/right steering linkage it looks
> like you may have the same problems I found in my design. It looks
> as if from your pictures that one of the wheel assemblies is slightly
> out of synch with the others. My question, does this show up as
> error when driving the 'bot. This synch problem combined with the
> fact that my design wouldn't allow me to balance my wheel assemblies
> with two wheels thereby causing a weight distribution problem, caused
> my 'bot to slowly veer to the right or left (depending). This sort
> of nullified the reasons for using the synchro platform in the first
> place so I abandoned my platform for a while.
Yes, the slight sync problem of the wheels causes a slow drift in one
direction. I didn't realize you had the same problem. I've grappled with this
problem over and over, and I can't get around it. A symmetrical placement of
the turntables will eliminate the problem. You say later in this message that
you're going to adapt the linkage to a four turn-table design - I'm working on
the same thing with the hopes it will develop into an all-purpose platform for
various projects.
> Also, is there a particular design reason for using the
> pulley's for the drive train? It seems like a slip in one side or
> the other could also cause the 'bot to become out of "synch".
No reason other than simple connection. A prior design had longer axles that
allowed a 24-tooth gear to be placed outside the pulleys and a chain to link the
two drive trains together, but I've found that the wheels slip before the
pulleys, so the linkage wasn't needed.
> This is definitely inspiring. I think I'll play with this
> a little tonight. I'm going to try and adapte this to my four
> turn-table design.
>
> Good job Wes,
> -Paul (pspeed@progeeks.com, http://www.progeeks.com/)
Thanks Paul, I consider it a compliment that people are duplicating this design
- so far I have heard from four people (on & off the newsgroup) who are
duplicating this design. There is another design flaw - the axle that has a
crown gear on one end and 14-tooth bevel on the other must have these gears
squeezed snug - otherwise the steering slips. I'm working on this one also.
-Wes
> Wes Matchett wrote:
> >
> > I have two new items on my web page:
> >
> > A mini syncro drive:
> > http://www.monumental.com/wesmat/lego/MiniSyncro/MiniSyncro.html
> >
> > Visual internals of a damaged Lego motor:
> > http://www.monumental.com/wesmat/lego/motor/Motor.html
> >
> > -Wes
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Message is in Reply To:
 | | Re: Web Page Update - new syncro/Lego motor internals
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| Bah, And I thought mine was small. Compared to yours, mine is a big hulking behemoth. :) (I know Wes in real life so I can only hope that maybe he was somewhat inspired by my design. ;) ) My linkage is completely different and not nearly as clever (...) (25 years ago, 15-Nov-99, to lugnet.robotics)
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