Question Flue

A $350-$mm$-$radius brake drum contacts a single short shoe, as shown in Figure $3,$ and sustains $225$ Nm of torque at $500$ rpm $.$ Assume that the coefficient of friction for the drum and shoe combination is $=0\mathrm{.}30.$

Determine the following:

$($a$)$ Normal force acting on the shoe

$[5$ Marks$]$

$($b$)$ Required actuating force, W $,$ when the drum has clock wise rotation

$[5$ Marks$]$

$($c$)$ Required actuating force, W $,$ when the drum has counterclockwise rotation

$[5$ Marks$]$

$($c$)$ Required change in the $37\mathrm{.}5$ mm dimension for self$-$locking to occur if the other dimensions do not change

$[5$ Marks$]$