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Belt Length:
As all belts stretch slightly in service getting the length right is important - unless you want to try several belts to get it right. Most drive systems have some adjustment for tension and measuring the length very close to the "shortest setting" will allow the maximum adjustment to be available to compensate for stretch as the belt beds in.

Most belt-drive machine tools have some sort of belt-tensioning mechanism. This can vary and might include:

1) one or more jockey pulleys that press on the back of the belt

2) a motor mounted on some sort of adjustable plate that can be moved to providing a "rough" setting for the belt length. In this case there is generally no way of slackening the belt as the drive is into a geared headstock

3) on machines with all-belt drive, in order to change speeds, the belt has to be slackened before it can be moved from pulley to pully and hence there will be some form "over-centre" lever or screw-operated adjuster. This can take the form of a threaded rod with a turn-buckle, this being combined with some sort of "over-centre" cam arrangement. In this case you will need to measure the length required with the pulleys in the tensioned position.

4) grinding machines sometimes have an arm, carrying a weight and holding a jockey pulley that presses down on the belt midway between two pulleys. To establish the correct length, make sure that the weight is taken off the arm and the belt stretched straight between the pulleys.

In all the systems above, set the two pulleys nearly as close together as possible and measure using either a non-stretch fabric tape or a long strip of paper that can be wrapped around the pulleys, overlapped and marked to get the exact length. It's suggested that two people do the measuring independently to cross-check the result.

Belt Width:
The flat belt can be the full width of the pulley - with one exception, a pulley with side flanges. If flanges are fitted leave a couple of mm clearance at each side or the belt will climb out of contact if it runs against the flange face.

Dimensions can be in inches or mm