Hi, look for old HP LaserJet l, ll, or lll printers. They have 100 oz., 5 volt steppers in them.
You don't want 450 oz steppers. They use too much current and the driver board will cost you a fortune. Look for 50-100 oz 5-6 volt 1-1.5 amp steppers. They run great on unipolar driver boards and surplus 12 volt PC powersupplies. With 1/4" to 3/8" or even 1/2" threaded rod you will get 8 to 18 inches a minute.
O rings wont work as a belt drive. You need toothed (timing) belts or direct drive. I would go direct. You already get a lot of mechanical advantage in your threaded rod/leadscrew.
Gantries are more complex than moving table designs. If you want cheap and simple and accurate and learning, keep it easy. Build a movable table. easier to calibrate too.
K.I.S.S.
Eric
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