Subject:
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RE: moving in a straight line with two motors?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 13 Nov 1998 15:00:23 GMT
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Original-From:
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Carl G. Schaefer, Jr. <[cgschaef@]spamless[futurelinkinc.com]>
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Viewed:
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2092 times
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Uhh --- that was a stupid comment, wasn't it? How do the Lego guys guard
(or shield) against the possibility of the motor magnets disrupting the
electronics or memory onboard the RCX?
Carl (with a very red, I-can't -believe-I'm-an-engineer, face)
-----Original Message-----
From: Laurentino Martins [mailto:lmartins@marktest.pt]
Sent: Friday, November 13, 1998 9:37 AM
To: cgschaef@futurelinkinc.com
Subject: RE: moving in a straight line with two motors?
Err... just on thing, what do you think motors use? Magnets!
Other type magnets will do as much as harm as your motors do, which is no
harm at all (if they are not too much strong).
Laurentino Martins
--//--
At 14:25 13-11-1998 Friday , you wrote:
> Ah-Oh...
>
> Magnets in close proximity to the RCX brick may not be a wise idea. On • just
> about all of my mobile bots, the motors are immediately adjacent to the RCX
> brick.
>
> Just my 2 cents (US, of course!)
>
> Carl
>
> -----Original Message-----
> From: Giesen, Oliver [mailto:OGiesen@mdsintl.com]
> Sent: Friday, November 13, 1998 8:39 AM
> To: 'lego-robotics@crynwr.com'
> Subject: RE: moving in a straight line with two motors?
>
>
> G'Day
> My 3 cents (Canadian, Eh).
> The most elegant solution I have seen to this problem I believe came from • an
> old Milton Bradly 'Big Trak', in which the designers used a magnetic • clutch.
> The idea is simple , getting the forces involved to balance may be more
> tricky I have not yet tried this with Lego(TM) bricks.
>
> Basically you get two large pulleys (or bars) and mount two magnets • opposite
> each other on the same side, one pulley has the two north poles facing out
> and one has the two south poles facing out, when the two pulleys are • mounted
> so that the magnets face each other the two pairs of magnates will attract
> each other and then when one axle is turned the other will turn with it.
>
> Now the tricky(?) part... the idea is that when both wheels are driving
> forward together the difference in torque will be low enough and the • magnets
> strong enough that the two axles will stay in step. When turning by only
> driving one motor and thus only side of our little clutch the torque will • be
> great enough to unstick the magnets and one side will spin freely.
>
> Its kind of cool to watch.
>
> This also seems to work better if the clutch turns faster that the wheels
> being driven, so it should be placed closer to the motor than the drive
> wheel end of the transmission drive chain.
>
> I hope I have been clear in my description, it is obvious when you see
> it.(sorry no web page yet)(;(
>
> Cheers!
> Oliver.
> ogiesen@mdsintl.com
> sent to lego-robotics@crynwr.com
>
> Horrible ASCII art:
> Top View
>
> | < axle
> | <
> ---------- < pulley 1
> n n < two magnets mounted on pulley 1's surface
> < air space
> s s < two magnets mounted on pulley
> ---------- < pulley 2
> | <
> | < other axle
>
> -----Original Message-----
> From: lugnet.robotics@lugnet.com [mailto:lugnet.robotics@lugnet.com]
> Sent: Thursday, November 12, 1998 10:11 PM
> To: lego-robotics@crynwr.com
> Subject: moving in a straight line with two motors?
>
>
> Hi,
>
> One of the first things I ran into when making a mobile 'bot using one
> motor for each of two drive wheels was the mismatch in their speed.
> Needless to say, it's a nice way to make curved path. Not what I want.
>
> <snip>
>
> Unfortunately, gear slop keeps this from working well for me. Any
> suggestions?
>
> Thanks,
> -Tim
>
> --
> Tim and/or Shelley Rueger - rueger "at" io.com
> WWW page: http://www.io.com/~rueger/
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Message has 1 Reply:
 | | RE: moving in a straight line with two motors?
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| Carl G. Schaefer, Jr. <lego-robotics@crynwr.com> wrote (...) By making sure the magnets are not strong enough to do those things. Which isn't hard - it takes a very strong magnet to interfere with solid state electronics. It's only magnetic media (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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