Jordan wrote:
On 2/25/2011 9:59 AM, Pete C. wrote:

Yep, and a worn out timing belt is a lot cheaper and easier to replace
than a gear with teeth broken off.

I can make a gear, not a belt.
Some belts that were made are no longer available. I know that to be
the case because I have a sewing machine with an irreplaceable timing
belt.
Unless there's a compelling reason to chose otherwise, I'm for a metal
only solution.
Have a look here

http://www.arceurotrade.co.uk/projec...ive%20Mods.pdf

and maybe

http://www.cad2gcode.com/pulley/

If you have the time then maybe you can re-engineer the sewing machine
to use a belt that is available. It's not unknown for manufacturers to
have custom components made, such as belts, so you have to buy the
spares from them at an increased mark-up, A mate used to work for a farm
machinery manufacturer that did that for some V belts. At the end of the
day you can work around it but it depends what you time is worth.