Small timing pulley and belts

[Yorkie]

From what you say Dave,  for a timing application you don't simply need pulleys and belting, but toothed pulleys and toothed belting to match.

The belting that Alan mentioned is very commonplace for such things as lathes - I use it on my  small Lorch-Schmidt  watchmakers' lathe. It's cheap, and as Alan says, you just cut it to length, heat the ends (I use a heated blade of a wallpaper scraper held in a vice), and press the ends together.

This stuff for example:

http://www.rdgtools.co.uk/acatalog/4mm-C...88009.html

But of course, that's only for normal 'V' pulleys where it's of no consequence if the belt happens to slip a little.

However, for a timing application, which is critical, it's a different matter altogether - we know what the consequences of a failed timing belt in a car engine are - it writes the engine off.

There are firms who will supply the belting that you need, and the toothed pulleys, but the pulleys are very expensive - EG: two pulleys and a belt will set you back about £100.

You don't say what application you need the pulleys and belts for or what your budget is, but I dare say this goes beyond the limit.

Anyway, for what it's worth, you might like to see if these are the sort of items you're searching for. The tooth pitch is 1.5mm, the belt width is 3mm:

http://www.ondrives.com/15gt-3-belt-15mm...belt-width

http://www.ondrives.com/15gt-blp-3-pulle...belt-width

The number on the pulley coding represents the number of teeth - for example, P48 = 48 teeth.

Hope that helps a bit.

(If that's no good, try a google search for 'toothed timing pulleys and belts' - that's how I found them).

Good luck in your quest.