Which Belt Profile

[jcb121]

what width of belt is best? and is it better to have a longer pulley on either the motor or the screw? or does this not matter?

[Jonathan]

The width depends on what you're doing, but in general 15mm wide is fine. If it's a long belt then increasing to 25mm is a good idea as it will raise the stiffness.

By longer I think you mean the width of the pulley? If so, you generally just want pulleys which are nominally the same width as the belt. In reality the pulleys are slightly wider, so there is some clearance between the belt and pulley flanges. The main thing is to make sure the pulleys are aligned axially, so the belt isn't rubbing against the flanges.

P.S. There are many threads discussing this on the forum.