The diameter of the pulley is calculated from the diameter of the pulley.
Considering the speed of sliding belt transmission loss, the diameter of the driven wheel should be rounded lump small than the calculated value (see note that diameter is inversely proportional to the speed and top formula), can consider from the pulley diameter 370 mm.
Set the diameter of the motor pulley (active wheel) diameter, the speed of rotation is d1, n1, from the wheel diameter, the speed d2, the n2, by the mechanical transmission principle d2 / d1 = n1 / n2 = I; D2 = d1 * (n1 / n2), in which the data is substituted (the diameter is machined and cartographed in mm), d2 = 200 * (1440/760), which is approximately 378.9 mm.
Some people have doubts that it is wrong to make a big correction from the wheel. The formula is quite clear that the diameter of the wheel should be corrected rather than corrected, if it is a bit larger than the calculation.
