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Eric,
I was about to throw a word of support for non-toothed belts ( such as
the round polyurethane belts). These are cheaper to use ( as the
pullies are simpler and more available), and as you suggest because you
can cut them to length, you can adjust the tension without followers, or
tension rollers ( if you need very high power transmission, then a
toothed belt would be a better option). They are also much more
accommodating of mis-alignment, in fact they are ideal for achieving 90
degree change of axis without a gearbox, or other mechanism.
We typically use red-thane a red/orange polyurethane tube, with a small
central hole, and connect these with doubled ended barbs.
We also use a combination clutch and one way rotation unit on the front
end of some of our hand cranked exhibits. I'll find out the supplier
details.
Cheers and keep crank' in
Stuart Kohlhagen
Manager New Concepts
Questacon
The National Science and Technology Centre
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Eric Yuan
Sent: Wednesday, 25 July 2007 7:24 AM
To: [log in to unmask]
Subject: Re: Timing Belt vs Roller Chain
ISEN-ASTC-L is a service of the Association of Science-Technology
Centers Incorporated, a worldwide network of science museums and related
institutions.
************************************************************************
*****
Thank you for the great responses! I'll throw a few more questions out
there since the list has been so helpful.
-I've seen museums use round belts that look like plastic string. I can
see an obvious advantage of using this belt to provide a reliable slip
clutch for overzealous visitors. Any thoughts on this?
-And speaking of slip clutches, do you usually recommend a friction
clutch from McMaster, or is there a better alternative for hand-cranked
applications?
This gives me a great start. Thanks!
-Eric
*****************************************
Eric Yuan
Exhibit Developer
Children's Museum of Portsmouth
280 Marcy Street
Portsmouth, NH 03801
(603) 436-3853
www.childrens-museum.org
*****************************************
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