1 files changed, 28 insertions, 0 deletions
diff --git a/213/CH10/EX10.12/10_12.sce b/213/CH10/EX10.12/10_12.sce
new file mode 100755
index 000000000..149270d5d
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+++ b/213/CH10/EX10.12/10_12.sce
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+//To find length of lever
+clc
+//Given:
+W=10*1000,P1=100 //N
+p=12,d=50 //mm
+mu=0.15
+//Solution:
+//Calculating the helix angle
+alpha=atan(p/(%pi*d)) //radians
+//Calculating the effort required at the circumference of the screw to raise the load
+phi=atan(mu) //Limiting angle of friction, radians
+P=W*tan(alpha+phi) //N
+//Calculating the torque required to overcome friction
+T=P*d/2 //N-mm
+//Calculating the length of the lever
+l=T/P1 //mm
+//Calculating the mechanical advantage
+MA=W/P1
+//Calculating the efficiency of the screw jack
+eta=tan(alpha)/tan(alpha+phi)*100 //%
+//Results:
+printf("\n\n The length of the lever to be used, l = %.1f mm.\n",l)
+printf(" Mechanical advantage obtained, M.A. = %d.\n",MA)
+if eta<50 then
+    printf(" The screw is a self locking screw.\n\n");
+else
+    printf(" The screw is not a self locking screw.");
+end
+\ No newline at end of file