The formula to calculate the Velocity Ratio of Belt given Total Percentage Slip is:
\[ i = \frac{(d_{driver} + t) \cdot (1 - 0.01 \cdot s)}{d_{follower} + t} \]
Velocity ratio is the distance through which any part of a machine moves to that which the driving part moves during the same time. Diameter of Driver is a chord that runs through the center point of the circle. Belt Thickness is defined as the thickness of the belt used in the belt drives. Total Percentage of Slip is defined as insufficient frictional grip between pulley (driver/driven) and belt. Diameter of Follower is a chord that runs through the center point of the circle.
Let's assume the following values:
Using the formula:
\[ i = \frac{(0.011 + 0.003) \cdot (1 - 0.01 \cdot 0.4)}{0.014 + 0.003} = 0.820235294117647 \]
| Diameter of Driver (ddriver) | Belt Thickness (t) | Total Percentage of Slip (s) | Diameter of Follower (dfollower) | Velocity Ratio (i) |
|---|---|---|---|---|
| 0.01 | 0.003 | 0.4 | 0.014 | 0.761647058823530 |
| 0.011 | 0.003 | 0.4 | 0.014 | 0.820235294117647 |
| 0.012 | 0.003 | 0.4 | 0.014 | 0.878823529411765 |
| 0.013 | 0.003 | 0.4 | 0.014 | 0.937411764705882 |
| 0.014 | 0.003 | 0.4 | 0.014 | 0.996000000000000 |
| 0.015 | 0.003 | 0.4 | 0.014 | 1.054588235294118 |
| 0.016 | 0.003 | 0.4 | 0.014 | 1.113176470588235 |
| 0.017 | 0.003 | 0.4 | 0.014 | 1.171764705882353 |
| 0.018 | 0.003 | 0.4 | 0.014 | 1.230352941176471 |
| 0.019 | 0.003 | 0.4 | 0.014 | 1.288941176470588 |