Sample Silent Chain Drive Selection

Driving shaft 1750 rpm, 11/2-in. shaft diameter Driven shaft 800 rpm, 2 /2-in. shaft diameter Center distance 28 in., adjustment available Drive arrangement acceptable Space restrictions none Lubrication available yes 

A minimum of 21 teeth is recommended. From Table 7-2, the maximum bore for a 21-tooth sprocket is 1.88 in. This is larger than the shaft diameter of 1.5 in., so the sprocket choice is acceptable. 

Enter Table 7-4 with the speed and number of teeth on the small sprocket and locate the power capacity per inch of chain width (interpolation is required in this example). 

Divide the design power by the power capacity to obtain the chain width  

This is not a readily available width, so ehoose the nearest larger chain that is available, 1V2 in. wide in this case. The availabihty of various chain widths must be determined by consulting the chain manufacturer or reseller. 

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