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GT Belt Selection
p = (2C + π(Dp+dp))/2 + ((Dp-dp)2)/4
b = 2Lp-π(Dp+dp)
C = (b+√b2-8(Dp-dp)2 )/8
Key
Lp= Belt length. C= Centre distance.
Dp= Large pulley pitch diameter. dp= Small pulley pitch diameter.

π = Pi