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+//(Power Screws) Example 6.4
+//Refer Fig. 6.13 on page 198
+//Number of starts of the screw n
+n = 1
+//Outer diameter of the screw d (mm)
+d = 40
+//Pitch of the screw p (mm)
+p = 7
+//Weight of the gate w (kN)
+w = 5
+//Frictional resistance in axial direction fr (kN)
+fr = 2
+//Inner diameter of the thrust washer Di (mm)
+Di = 40
+//Outer diameter of the thrust washer Do (mm)
+Do = 80
+//Coefficient of friction at the threads mu1
+mu1 = 0.15
+//Coefficient of friction at the washer mu2
+mu2 = 0.12
+//Radius at which the force is exerted rad (mm)
+rad = 500
+//Permissible bearing pressure Sb (N/mm2)
+Sb = 5