A square-thread power screw has a major diameter of 32 mm and a pitch of 4 mm with double threads. The given data for the power screw include, f=0.07, dc=40mm, and F=8.4kN per screw.

1. Find the thread depth, thread width, pitch diameter, minor diameter, and lead.

2. Find the torque required to raise and lower the load.

3. Find the body stresses, torsional and compressive.

4. Find the bearing stress.