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//(Power Screws) Example 6.11
//Refer Fig.6.27 on page 215
//Force applied by operator P (N)
P = 100
//Mean radius R (mm)
R = 500
//Coefficient of friction (mu)
mu = 0.15
//Nominal diameter of the upper screw dUp (mm)
dUp = 50
//Pitch of the upper screw pUp (mm)
pUp = 12
//Nominal diameter of the lower screw dLow (mm)
dLow = 50
//Pitch of the upper screw pLow (mm)
pLow = 8
//Number of starts of both the screws n
n = 1
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