This page is a continuation of How to Design a Flat Belt Drive [Stepbystep Tutorial] – Page 1.
Step 3 – Finding Design Power in kW:
Design power in kW can be found out using the following equation:
Rated power in KW will be provided in the problem itself. To find the correction factors in the above equation, see the section below.
Determination of Correction Factors:
a. Load Correction Factor:
Load correction factor can be determined from the following table.
Table (i) – Load Correction Factor
Type of Load  Applications  Load Correction Factor 

Normal Load  (When maximum load is known)  1.0 
Steady Load  Light duty fans, centrifugal pumps, printing machinery, textile machinery, screens, agitators, evaporators and light machinery  1.2 
Intermittent Loads  Heavy machine tools, heavy duty fans and blowers, air compressor, reciprocating pumps, elevators, mill machinery, line shafts, paper mill and saw mill machinery  1.3 
Shock Loads  Hammers, grinders, crushing machines, disintegrators, vacuum pumps, rolling mills, tube mills, ball mills, automated machinery and stamp presses  1.5 
Note: If you are using PSG design data book, refer page no. 7.53 (May 2012 reprint) for this table.
b. Arc of contact factor:
In order to determine arc of contact factor, you must first find the arc of contact. Arc of contact can be determined using the following equation:
where,
D → Diameter of the larger (driven) pulley
d → Diameter of the smaller (driving) pulley
C → Centre distance between the two pulleys
Note: If you are using PSG design data book, refer page no. 7.54 (May 2012 reprint) for this equation.
After finding the arc of contact, you must change it to the nearest standard value (greater than the one determined) and find its corresponding correction factor. The following table will help you do this.
Table (ii) – Arc of contact factor
Arc of Contact  Arc of Contact Factor 

90°  1.68 
120°  1.33 
130°  1.26 
140°  1.19 
150°  1.13 
160°  1.08 
170°  1.04 
180°  1.00 
190°  0.97 
200°  0.94 
210°  0.91 
220°  0.88 
230°  0.86 
240°  0.84 
250°  0.82 
Note: If you are using, PSG design data book, refer page no. 7.54 (May 2012 reprint) for this table.
c. Smaller Pulley Diameter Factor:
Smaller pulley diameter factor can be found using the table below:
Table (iii) – Smaller Pulley Diameter Factor
Smaller Pulley Diameter (in mm)  Smaller Pulley Diameter Factor 

Upto 100  0.5 
100200  0.6 
200300  0.7 
300400  0.8 
400750  0.9 
Above 750  1.0 
For the fourth step (i.e., determining velocity of belt), go to next page.
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