LO$2$ Determine parameters within mechanical engineering systems.

Assignment Brief and Guidance

Scenario:

You are the Maintenance Manager of a large galvanising company in Telford. At the weekly management

meeting, the Managing Director and Finance Director have raised concerns and asked you to deal with the

following maintenance issues before next week's meeting.

Gantry crane breakdown

The travelling gantry crane has broken down. To affect a repair, one of the supporting legs has to be

lifted. Can this be handled in house, or is specialist lifting gear required?

A diagram of the crane and the distribution of its weight is shown below.

a$.$ Determine the reaction force carried on each leg

b$.$ You have a $1\mathrm{.}5$ tonne jack available to lift each leg $-$ will this be sufficient and if so what safety

fartnr dnec it nive?

Whilst repairing the crane, you take the opportunity to check the condition of the wheel bearings and

need to remove a cover plate to do so$.$ After checking the bearings, you need to replace the cover

plates.

The cover plate is washer like in shape and made from aluminium. It has an internal diameter of

$48\mathrm{.}2mm$ and a thickness of $5mm($figure $2).$

The cap must fit onto a shaft which has a diameter of $48\mathrm{.}3mm.$

Determine:

c$.$ The diameter of the aperture in the washer if its initial temperature is $21C$

and it is heated to $150C,$ take the coefficient of linear expansion for

aluminium to be $24{10}^{-6}m{C}^{-1}$

d$.$ The iron shaft, at the same initial temperature, is subject to a temperature change of $40C$ due to

heat transfer during the fitting process $-$ what will the shaft's final diameter be and will the washer

fit? Take the coefficient of linear expansion for iron to be $9{10}^{-6}m{C}^{-1}$