Typically found in lathes, light-duty milling machines, drills, and other power tools plastic or nylon molded v-belt pulleys are designed to be excellent solutions for low and fractional horsepower drives. And while standard design v-belt pulleys are appropriate for most applications, there are situations where a custom v-belt pulley is necessary.
For some applications, a mechanical speed drive is desirable. Variable speed pulleys provide users with efficient power transmission within a specific speed range. Some mechanical designs require simplicity and an electronic speed controlled drive may not be the best option.