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+//(Power Screws) Example 6.6
+//Number of starts n
+n = 1
+//Nominal diameter of the screw d (mm)
+d = 52
+//Pitch of the screw p (mm)
+p = 8
+//Outer diameter of the friction collar Do (mm)
+Do = 100
+//Inner diameter of the friction collar Di (mm)
+Di = 60
+//Coefficient of friction for thread mu1
+mu1 = 0.15
+//Coefficient of friction for collar mu1
+mu2 = 0.12
+//Axial force to be exerted W (kN)
+W = 2
+//Lead screw rpm N
+N = 30
+//For ISO Metric Trapezoidal threads theta (degree)
+theta = 15