The speed of the pulley is calculated. For example, the speed of the motor is 1440 rpm. If you want to reduce it to 220 rpm, the method is as follows: 1440*small pulley diameter=220*large pulley diameter.Just solve this equation.To calculate the speed of the pulley, make an analogy. The diameter of the main belt pulley is 300mm, the speed is 2000 revolutions, and the speed of the belt pulley is 800 revolutions. Find the diameter of the belt pulley. Conversion method: 300 times 2000 and then divided by 800 is what you want diameter.In fact, strictly speaking, it is necessary to convert to perimeter, that is, first multiply by 3.14, and then divide by 3.14. This is just to simplify it, and the result is correct.The diameter of the driven pulley is 310 mm, and the speed requirement is 900 rpm, the diameter of the pulley on the 1460 speed motor should be: 310*900/1460=191 mm; How to calculate the linear speed of the pulley How to calculate the diameter of the pulley The formula is as follows: a/b *A=B The driving wheel speed is: A The driving wheel diameter is: a The driven wheel speed is: B The driven wheel diameter is: b Wheel diameter X3.14X motor speed X motor pulley diameter / turbine pulley diameter / reduction speed ratio = saw blade speed ; Wheel diameter X3.14X motor speed X motor pulley diameter/saw blade speed/reduction speed ratio=turbine pulley diameter; line speed/(wheel diameter X3.14X motor speed/worm gear pulley diameter/speed ratio of reducer)=motor pulley diameter.