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diff --git a/3864/CH6/EX6.7/Ex6_7.sce b/3864/CH6/EX6.7/Ex6_7.sce
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+clear
+//
+//
+
+//Initilization of Variables
+
+P=3750*10**6 //N-mm/sec
+n=240 //Rpm
+q_s=160 //N/mm**2 //Max shear stress
+
+//Calculations
+
+//d2=0.8*d2 //mm //Internal Diameter of shaft
+
+//J=%pi*32**-1*(d1**4-d2**4) //mm**4 //Polar modulus
+//After substituting value in above Equation we get
+//J=0.05796*d1**4
+
+T=P*60*(2*%pi*n)**-1 //N-mm //Torsional moment
+
+//Now from Torsion Formula
+//T*J**-1=q_s*R**-1    ......................................(1)
+
+//But R=d1*2**-1 
+
+//Now substituting value of R and J in Equation (1) we get
+d1=(T*(0.05796*q_s*2)**-1)**0.33333
+
+d2=d1*0.8
+
+//Result
+printf("\n The size of the Shaft is:d1 %0.3f  mm",d1)
+printf("\n                         :d2 %0.3f  mm",d2)