Calculation of speed ratio between big pulley and small pulley

It is known that the diameter of large pulley D2 @ 2000 mm (in mm mechanically), N 1 @ 1480 revolutions; Integral @1480; 60 revolutions; Seconds, v @ 2m @ @ 2000mm；; Seconds, first calculate the diameter of the small pulley d 1, according to the formula:

Calculation of small pulley diameter

According to the formula: d1= v/(π n1) = 2000× 60/(3.14×1480) = 25.82 (mm).

Speed ratio calculation

Speed ratio I = n1/N2 = D2/d1= 2000/25.82 = 77.45.

problem analysis

The diameter of the small pulley is only 25.82 mm, which is only slightly thicker than our thumb and thinner than the motor shaft. Isn't it funny to drag a big pulley with a diameter of 2000 mm? In addition, the wrap angle of the belt on the small pulley is too small, which will slip, thus making the transmission extremely unreliable. This kind of transmission must not be used in engineering!

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