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Part $1$

Draw an activity chart for a machine operator with the following operation. The relevant times are as$$ follows:

Prepare mill for loading$($cleaning$,$ oiling, and so$$ on$)$

$0\mathrm{.}50$ min

Load mill

$1\mathrm{.}75$ min

Mill operating$($cutting material$)$

$2\mathrm{.}25$ min

Unload mill

$0\mathrm{.}75$ min

Part $2$

Plot all required processes and their relevant times on the chart. Choose the correct graph below.

A$.$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

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$5$

$6$

$1$

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$6$

Time

Operator

Time

Machine

Time

Prepare Mill

Idle

Idle

Unload Mill

Load Mill

Mill

Operating

$($Cutting

Material$)$

Idle

An activity chart has columns labelled "Time," "Operator," and "Machine." From $0$ to $0\mathrm{.}50$ minutes, the operator is labelled "Prepare Mill" and the machine is labelled "Load Mill." From $0\mathrm{.}50$ to $2\mathrm{.}25$ minutes the operator is labelled "Idle" and the machine is labelled "Load Mill." From $2\mathrm{.}25$ to $4\mathrm{.}50$ minutes the operator is labelled "Idle" and the machine is labelled "Mill Operating $($Cutting Material$)."$ From $4\mathrm{.}50$ to $5\mathrm{.}25$ minutes the operator is labelled "Unload Mill" and the machine is labelled "Idle." All times are approximate.

B$.$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

$2$

$3$

$4$

$5$

$6$

Time

Operator

Time

Machine

Time

Prepare Mill

Load Mill

Idle

Unload Mill

Idle

Mill

Operating

$($Cutting

Material$)$

Idle

An activity chart has columns labelled "Time," "Operator," and "Machine." From $0$ to $0\mathrm{.}50$ minutes, the operator is labelled "Prepare Mill" and the machine is labelled "Idle." From $0\mathrm{.}50$ to $2\mathrm{.}25$ minutes the operator is labelled "Load Mill" and the machine is labelled "Idle." From $2\mathrm{.}25$ to $4\mathrm{.}50$ minutes the operator is labelled "Idle" and the machine is labelled "Mill Operating $($Cutting Material$)."$ From $4\mathrm{.}50$ to $6\mathrm{.}00$ minutes the operator is labelled "Unload Mill" and the machine is labelled "Idle." All times are approximate.

C$.$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

$2$

$3$

$4$

$5$

$6$

Time

Operator

Time

Machine

Time

Prepare Mill

Load Mill

Idle

Unload Mill

Idle

Mill

Operating

$($Cutting

Material$)$

Idle

An activity chart has columns labelled "Time," "Operator," and "Machine." From $0$ to $0\mathrm{.}50$ minutes, the operator is labelled "Prepare Mill" and the machine is labelled "Idle." From $0\mathrm{.}50$ to $2\mathrm{.}25$ minutes the operator is labelled "Load Mill" and the machine is labelled "Mill Operating $($Cutting Material$)."$ From $2\mathrm{.}25$ to $4\mathrm{.}50$ minutes the operator is labelled "Idle" and the machine is labelled "Mill Operating $($Cutting Material$)."$ From $4\mathrm{.}50$ to $5\mathrm{.}25$ minutes the operator is labelled "Unload Mill" and the machine is labelled "Idle." All times are approximate.

D$.$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

$2$

$3$

$4$

$5$

$6$

$1$

$2$

$3$

$4$

$5$

$6$

Time

Operator

Time

Machine

Time

Prepare Mill

Load Mill

Idle

Unload Mill

Idle

Mill

Operating

$($Cutting

Material$)$

Idle