Within lean initiatives, Time is the most important factor. The efficiency of a value stream is measured based on Lead times, for which you need process time and waiting times.
The effectiveness of the value stream is calculated by comparing (actual) cycle times with the Takt time.
Knowing the different times and the goals for which they are used can prevent long discussions at value stream events. It is therefore advisable to define each term before you start mapping, especially because different organizations use different definitions of the terms.
I am working on implementing OEE in one of our machines that makes centertubes for automotive oil filters. The steel is rolled and each part number has specific diameter and length. However, the run-rates vary for each part numbers. I am somewhat able to calculate Takt time for each part number based on the standard run-rate. However, the problem for me is to determine Ideal Cycle Time. The machine can run as fast as 65 PPM for one part number while it runs as slow as 13 PPM for some other part number. In this case, what would be the optimal way to calculate Ideal Cycle Time for each part numbers? As you know, Ideal Cycle time is required to calculate Performance Metric of OEE.
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