Machine Utilization For High-Mix, Low-Volume Operations

We understand that Queue Time, Flow Variability and Process Times affect process flow variability. Always remember to add up the utilization of the same machine base on the products using it. Except for utilization = arrival rate x effective processing times for mutiple products for the first machine, you always have to consider queue time, process times and the flow variability of previous departing flow for subsequent machines. Use the correct CTq equation for single or multi-machine scenarios too. Then compare the results with Best Case, Practical Worst Case or Worst Case.

The below pictures gives a good approach to reviewing operations if the results are close to worst case.