initial commit / add all books

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
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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
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