This page is a continuation of How to Design a Flat Belt Drive [Stepbystep Tutorial] – Page 3.
Step 7 – Finding Load Rating at V m/s:
For “HI – SPEED” 878 g duck belting, load rating at 10 m/s is 0.023 kW per mm per ply.
For “FORT” 949 g duck belting, load rating at 10m/s is 0.0289 kW per mm per ply.
Load rating at V m/s = Load rating at 10 m/s × (V/10) kW per mm per ply
Note: If you are using PSG design data book, refer page no. 7.54 (May 2012 reprint) for finding the load rating.
Step 8 – Finding Belt Width (b):
Width of belt (b) can be found using the following equation:
In the above equation, load rating implies load rating at V m/s that you have found in the previous step.
After finding the belt width, you must change it to the nearest standard value (greater than the one determined) and fix it as the permanent value. Refer the following table to choose a standard belt width according to the number of plies and the type of belt used.
Table (v) – Standard Flat Belt Widths in mm
3 Plies  4 Plies  5 Plies  6 Plies  8 Plies 

25◊  25•  76◊  100•  200¤ 
32•  32•  90•  112◊  250¤ 
40◊  40◊  100◊  125◊  305¤ 
44•  44◊  112◊  152◊  355¤ 
50◊  50◊  125◊  180◊  400¤ 
63◊  63◊  152◊  200◊  
76◊  76◊  180¤  250¤  
90•  90◊  200•  
100•  100◊  224•  
112◊  250¤  
125◊  
140•  
152◊  
200• 
In the above table,
◊ → Sizes available in both “HISPEED” and “FORT” duck belting
• → Sizes available only in “HISPEED” duck belting
¤ → Sizes available only in “FORT” duck belting
Note: If you are using PSG design data book, refer page no. 7.52 (May 2012 reprint) for the above table.
Step 9 – Determining Pulley width:
Pulley width can be obtained using the following equation:
Pulley width = Belt width (chosen standard) + Additional width
Additional width has to be chosen according to the belt width. The following table helps you do that.
Table (vi) – Determination of Additional Width from Belt Width
Belt Width  Additional width 

Upto and including 125 mm  13 mm 
Above 125 mm upto and including 250 mm  25 mm 
Above 250 mm upto and including 375 mm  38 mm 
Above 375 mm upto and including 500 mm  50 mm 
Note: If you are using PSG design data book, refer page no. 7.54 (May 2012 reprint) for this table.
Once the pulley width is found, you must change it to the nearest standard value (greater than the one determined) and fix it as the permanent value.
A list of standard pulley widths (in mm) is given below:
Note: If you are using PSG design data book, refer page no. 7.55 (May 2012 reprint) for finding the standard pulley width.
Step 10 – Determining the length of flat belt (L):
This is the last step. Length of belt varies according to the type of flat belt drive.
For open flat belt drive, length of belt is given by:
For crossed flat belt drive, length of belt is given by:
For quarter turn flat belt drive, length of belt is given by:
where,
D → Diameter of the larger pulley
d → Diameter of the smaller pulley
C → Centre distance between the two pulleys
Note: If you are using PSG design data book, refer page no. 7.53 (May 2012 reprint) for these length formulae.
That’s it. You have successfully designed a flat belt drive using manufacturer’s data
If you have any ideas or feedbacks, feel free to comment on this article
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