In a horizontal flat belt drive, it is customary to use
A. Bottom side of belt as slack side
B. Top side of belt as slack side
C. Idler pulley
D. None of the above
Answer: Option B
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When the tight side is at the bottom, the belt is pulled tight as it leaves the driving pulley, maintaining a better grip.
The slack side, being on top, tends to sag under gravity. This increases the belt’s wrap angle around the driving pulley.
More contact = better torque transmission.