Alt-BEAM Archive

Message #09803



To: beam@sgiblab.sgi.com
From: Steven Dang az-anuxm1@usa.net
Date: 5 Feb 00 13:49:02 CST
Subject: [alt-beam] lens motor


Where can i find some good high torque motors for a walker. I've heard t=
hat
the lens motors from bg micro are good, but i can't find them in the cata=
log. =

Could someone tell me where to find some good motors.

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9804 Sat, 05 Feb 2000 19:55:33 GMT [alt-beam] "Redefining Robots" beam@sgiblab.sgi.com "Mike Kulesza" I highly recommend getting a copy of February 2000s Smithsonian Magazine...
Has a very interesting 12 pg. feature on Tilden and his creations, with some
nice pictures.
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9805 Sat, 05 Feb 2000 20:02:49 GMT [alt-beam] Blue LEDs beam@sgiblab.sgi.com "Mike Kulesza" Why is it or was it so difficult and complicated to produce Blue LEDs? This
also makes them so expensive... and extremely rare - never saw one. Cant you
just use different dye for plastic? Or is it a special device inside?? I
mean Red, Yellow, and Green LEDs are usually coloured (except for clear
LEDs).
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9806 Sat, 5 Feb 2000 15:18:25 -0500 [alt-beam] Re: Blue LEDs "Dennison Bertram" It's a special device. They are very fragile, and are produced differently.
There is a big difference between them and other diodes. Not just different
dye. As you notice, White LEDS are also very expensive.

dennison

Why is it or was it so difficult and complicated to produce Blue LEDs? This
also makes them so expensive... and extremely rare - never saw one. Cant you
just use different dye for plastic? Or is it a special device inside?? I
mean Red, Yellow, and Green LEDs are usually coloured (except for clear
LEDs).
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9807 Sat, 05 Feb 2000 15:28:00 -0500 [alt-beam] Re: My first Photovore beam@sgiblab.sgi.com "FCO Enr." Greetings Pete,

Thanks for your reply! I am using parts which were ordered
from Solarbotics and I am sure the motors are efficient. I am also
pretty sure it is some mistake of mine rather than defective components
that is causing me such irritation.

I am learning a lot about electronics just putting this little
kit together and I guess my question is, if you've put the circuit together
4 times already and checked all connections and still nothing.. what
do you do then? How can I test the motors.. you know just get them
spinning so I know they work? What is the valid range of the 100k pot
so I could determine what the middle is (it just spins endlessly in both
directions), for the siemmens IR1 sensors what is the leg which goes to
the pot? the long or short one? ( I tried one in one direction while the
other reversed just to see if one side worked but nothing). etc..

Thanks again for the reply.

Andy

On 05/02/00, at 11:25 AM, Pete McCarthy wrote:

>I really think that the problem is your motors are inefficient. That
>was the cause of my photovore failure, and could be one reason why your
>photovore isn't working. If it were a bad part, then probably only one
>half of the robot would work while the other would function perfectly.
>-Pete

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