Hey guys.. Sorry for my english, i'am only 16 and it's not my parent language. I need help about a problem on mechanical engineering, and i really appreciated if you can help me out. I assume that i've got a moter currents which gives me out 220-230 Volt trend, and has 1800 bends per minute. Now i want to know how much diameter should have a pulley to put it on another machine. I want this machine to give 80 bends per minute. And what pulley should i put in the original current moter to suit them. The starting transmission from the moter will be done with a belt.. For more details or clarifications, just ask me..