Variable Pitch V-Belt Pulleys
The very notion of a power transmission requires the transfer of power from one rotating shaft to another. That is done with gears and pulleys. Gears use interlocking teeth to transfer power. The transfer of rotary power from one pulley to another, however, requires a shared belt that fits within a groove that encircles the pulley. The length of the belts are triangular, forming a V for the best fit into the pulley channel. Standard V-belt pulleys require belts of compatible width to fit into their channels. Pulleys that enable a custom changing of the width of the channel into which the V belts fit are called variable pitch V-belt pulleys. A variable pulley can not only be made wider or narrower to accommodate belts in different widths, but such adjustments can also fine tune the drive speed in small increments, as desired. Adjust V belt pulley pitch by loosening the set screws on the hub, then turn the hubs to adjust the groove size, and re-tighten the set screw. For more power transmission pulleys, see our standard V belt pulleys, timing belt pulleys, idler pulleys.