A semi$-$automated assembly machine, assembles and welds automotive components for a single shift of $8$ hours, $5$ days a week; planned throughput $=275$ units$/$hour; actual output $=2200$ units$/$week$.$ Calculate Overall Equipment Efficiency. $(8$ marks$)$

The following losses are encountered during assembly:

$>$Incorrect assembly causes the machine to stop and needs re$-$set on average $6$ times$/$hr$.$ where $4$ unit and $8$ minutes are lost.

$>$Worn out electrodes are to be replaced once per week, it takes $75$ minutes when $45$ units are scrapped

$>$Burst out cooling hose causes a machine breakdown once in a month and replacement takes $6\mathrm{.}25$ hours

$>$Misaligned fixture causes a loss of $220$ units$/$ week

$>$For different size parts, fixtures to be removed and replaced and electrode position to be adjusted $3$ times$/$week which takes $3$hours where $40$ units are scrapped each time

$>$Actuating cylinder sometimes sticks for $35$ minutes$/$adjustment causing production delay which takes double cycle time

$>$Application of rust protective spray by operator stopping the machine at the start and end of the day takes $8$ minutes each time

$>$Limit switches corrode once in every $7$weeks stopping the machine and replacement takes $330$ minutes.