If an Acmethread power screw it loaded in tension with a for

If an Acme-thread power screw it loaded in tension with a force of 30 000 lb, what size screw from Table 17- 1 should be used to maintain a tensile stress below 10 000 psi7

Solution

We can write

Force = stress*Area

Area = Force/Stress = 30000/10000 = 3 in^2

Now

Area = pi/4*d^2 = 3 in

d = 1.95 in

The collest Theard is

d = 2 in