This page is a continuation of How to Design a Flat Belt Drive [Stepbystep Tutorial] – Page 2.
Step 4 – Finding the Belt Velocity (V m/s):
Maximum velocity of belt (V) can be found out using the following equation:
where,
d → Diameter of the smaller (driving) pulley in m
N_{1} → Speed of the driving pulley in rpm
Step 5 – Selection of Belt:
There are two types of belts from which you can select from. They are:
 Dunlop “HI – SPEED” 878 g duck belting – Used in light and medium duty applications with high belt velocity.
 Dunlop “FORT” 949 g duck belting – Used in heavy duty applications with medium belt speeds.
For design power < 20 kW and belt velocity > 16 m/s, select Dunlop “HI – SPEED” 878 g duck belting.
For design power > 20 kW and belt velocity < 16 m/s, select Dunlop “FORT” 949 g duck belting.
Note: If you are using PSG design data book, refer page no. 7.52 (May 2012 reprint) for selecting the right flat belt.
Step 6 – Determination of number of plies:
The number of plies can be determined using the maximum belt velocity and the minimum pulley diameter from the following table.
Table (iv) – Determination of number of plies using maximum belt velocity and minimum pulley diameter
No. of plies  Maximum belt velocity in m/s  

10  15  20  25  30  
3  90  100  112  140  180 
4  140  160  180  200  250 
5  200  224  250  315  355 
6  250  315  355  400  450 
8  450  500  560  630  710 
In the above table, the values given in italics are the values of minimum pulley diameter in mm.
Note: If you are using PSG design data book, refer page no. 7.52 (May 2012 reprint) for the above table.
For the next step (i.e., Finding Load Rating at V m/s) go to next page.
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