Example:

One worker Operating two semi$-$automatic lathes. The cycle consists of Load M$/$C $(2$ min$),$ Machine part $(4$ min$)($the machine stops automatically at the end of cut$)$ and unloaded machine $(2$ min $).$ The two machines are alike and each completes the machining operation and stops automatically

Construct a worker$-$machine activity chart. The chart is to show the worker starting the machines in the morning with both machines empty and continues until each machine completes two cycles, i$.$e it has machines two pieces. The chart should have one column for the worker and a column each for machine $1$ and machine $2.$

Estimate the utilization of the worker and the machines.