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//CHAPTER 3 ILLUSRTATION 9 PAGE NO 108
//TITLE:FRICTION
clc
clear
//===========================================================================================
//INPUT DATA
d=5// MEAN DIAMETER OF SCREW IN cm
p=1.25// PITCH IN cm
W=10000// LOAD AVAILABLE IN NEWTONS
dc=6// MEAN DIAMETER OF COLLAR IN cm
U=.15// COEFFICIENT OF FRICTION OF SCREW
Uc=.18// COEFFICIENT OF FRICTION OF COLLAR
P1=100// TANGENTIAL FORCE APPLIED IN NEWTON
PI=3.147
//============================================================================================
//CALCULATION
ALPHA=atand(p/(PI*d))//
PY=atand(U)//
T1=W*d/2*tand(ALPHA+PY)/100// TORQUE ON SCREW IN NEWTON
Tc=Uc*W*dc/2/100// TORQUE ON COLLAR IN NEWTON
T=T1+Tc// TOTAL TORQUE
D=2*T/P1/2*100// DIAMETER OF HAND WHEEL IN cm
//============================================================================================
//OUTPUT
printf('SUITABLE DIAMETER OF HAND WHEEL =%3.3f cm',D)
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