ISEN-ASTC-L is a service of the Association of Science-Technology Centers Incorporated, a worldwide network of science museums and related institutions. ***************************************************************************** Hello, I'm designing a hand-powered exhibit and I'd like to know if there are advantages of using a "timing belt" over a "roller chain". Perhaps there are differences in maintenance and wear, friction, maximum distance between shafts, price? Thanks for your thoughts! Eric ***************************************** Eric Yuan Exhibit Developer Children’s Museum of Portsmouth 280 Marcy Street Portsmouth, NH 03801 (603) 436-3853 www.childrens-museum.org ***************************************** *********************************************************************** For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org. Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org. The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit http://www.lsoft.com/LISTSERV-powered.html. To remove your e-mail address from the ISEN-ASTC-L list, send the message SIGNOFF ISEN-ASTC-L in the BODY of a message to [log in to unmask]