05642 [alt-beam] dicovery channel

Alt-BEAM Archive

Message #05642

To: "alt-beam@egroups.com" alt-beam@egroups.com
From: michael.hirtle@ns.sympatico.ca (Michael Hirtle)
Date: Wed, 11 Aug 1999 14:43:53 -0300
Subject: [alt-beam] dicovery channel

--------------310EB7F923F88B96C07E558B
content-transfer-encoding: 7bit
content-type: text/plain; charset=us-ascii

hello list i know you like robots and such i and i know most of u have
the dicovery channel so i was woundering if u could got to
http://www.dicovery.com/about/contact.html and send an email to the
viewer relations asking them since they have a bear week and a snake
week and a shark week and all the other animal weeks that they should
have a robot week divoted to robots and robot makers so people that get
the dicovery channel will learn more about robots

--------------310EB7F923F88B96C07E558B

Attachment: contact.html

Discovery Online, Contact Us

> >

>http://www.discovery.com/online.html" TARGET="_top"
>

http://www.discovery.com/gallery/logolg.gif"
WIDTH=135 HEIGHT=84 border=0
> > >

>
>

Click here for more information on Eukanuba Dog Food

> >

>http://shopping.discovery.com" target="_top"
>

> >

Contact Us!

So ... how are we doing? Give it to us straight -- we can take it.

Online Questions

letters@discovery.com

TV Questions

viewer_relations@discovery.com

For a quicker response to your television questions, please call us at 1-888-404-5969.

But first check our Frequently Asked Questions (FAQs) lists for both online and television.

A B O U T T H I S S I T E
Welcome! Contact Us! Online FAQs Television FAQs Who We Are Site Guide Software Tools Advertising DISCOVERY ONLINE HREF="/copyright.html" target="_top">Copyright © 1999 Discovery Communications Inc.

--------------310EB7F923F88B96C07E558B--

5643 Wed, 11 Aug 1999 12:34:30 -0700 (PDT) [alt-beam] Solarbotics Miniball Kit for Sale beam@sgiblab.sgi.com Lee Golden Hi --

I bought a Solarbotics Miniball kit several months ago, but have yet to
get around to building it. The kit is complete and unbuilt including
the custom made hand built gear motor!

MY cost was $160.00, but I am willing to entertain cash/trade offers
for it. Just not enough time to do everything I want to...sigh.

Please don't "reply" to this message as it will send to the entire
list! If you are interested, make an offer to "leemon1@yahoo.com".

Thanks,

Lee Golden
Olney, MD USA

5644 Wed, 11 Aug 1999 13:15:21 -0600 [alt-beam] "Linear Wheels" (was: LEM videos now on-line) beam@sgiblab.sgi.com "John A. deVries II" At 11:31 AM 08/11/1999 , Sean Rigter wrote:

>I found that net linear motion does results in my 3 motor design but is very
>inefficient with a lot of wheel dragging and slipping resulting in high
>frictional losses compared to, for example, Bolt's 2 motor design!
>These losses are caused by the "toe in" of the 3 wheels which oppose
> all net linear motion. Even if one wheel is held perfectly stationary causing
> the platform to rotate about that relatively low friction pivot point , the
> sideways dragging and slipping between wheel and
>surface (ie friction losses) of the other 2 wheels is very high.
>
>So my question are:
>
>Am I missing something?

This might have no bearing (pardon the pun) on what you are talking about,
Sean, but I strongly suggest that you take a look at a two
degree-of-freedom "linear wheels". They are more complex than everyday
wheels, but they ARE free to move (with quite low friction) in directions
other than the driving direction. See:

http://carol.wins.uva.nl/~leo/lego/killough.html

for the basic description and the following mpg movies to see the Killough
platform in motion:

http://www.net-info.com/~dcarlson/klw1.mpg high resolution/shorter
length movie
http://www.net-info.com/~dcarlson/klw2.mpg low resolution/longer
length movie with several different motions

Zoz

---------------------------------------------------------------

Do you have a BEAM question?
Try one of the following sites -- they really help!

BEAM Mailing List Archive http://www.egroups.com/list/alt-beam
Advanced BEAM Mailing List http://www.egroups.com/list/spinalcolumn
BEAM Heretics http://www.serve.com/heretics/
BEAM Robotics Tek FAQ http://people.ne.mediaone.net/bushbo/beam/FAQ.html
BEAM Mailing List Archive http://www.egroups.com/list/alt-beam/
BEAM Online http://www.beam-online.com/
Chiu-Yuan's BEAM Page http://www.geocities.com/SouthBeach/6897/

Home