Question #$10$

A single square$-$thread power screw, similar to the one shown below, has a major diameter of $32mm$ and a pitch of $4mm.$ The given data include $f=fc=0\mathrm{.}08,dc=40mm,$ and $F=6\mathrm{.}4kN$ per screw.

$($a$)$ Find the thread depth, thread width, pitch diameter, minor diameter, and lead.

$($b$)$ Find the torque required to raise and lower the load.

$($c$)$ Find the efficiency during lifting the load.

$($d$)$ Find the bearing stress.

$($ e $)$ Find the thread stresses bending at the root, shear at the root, and von Mises stress and maximum shear stress at the same location.