I need help with OEE. I’m just getting started and conceptually it is quite easy, in practice I’m a bit confused. The first system that I have been asked to set up is an autoclave. Currently we don’t collect much information on the autoclave except cycle reports that print out from the machine (recipe ID, start time, stop time, pass/fail). Generally speaking we have 14 hour shift coverage 7 days per week. But, the autoclaves are only running about 20% capacity right now so the prep time, load time, and unload activities are done sporadically when operators are otherwise not occupied. Because of this, I’d like to characterize operating time as the summation of pressing “Start” through cycle completion for each product run. With this definition I am calculating:
Quality=(TotalRuns – FailedRuns)/TotalRuns
Performance=Average(IdealCycleTime)/(Average(OperatingTime/Runs))
I am lost on what to do for Availability in this case. I am thinking that PlannedProductionTime should just be sum(IdealCycleTime*Runs) and OperatingTime should be sum(CycleTime) for passing runs. Failed runs counting as down time.
Now this fails to account for repair time in the down time. It is difficult to assess repair time because we are running at such a low utilization…the repair isn’t usually time critical and might sit for a while. We currently do not track down time on this equipment. Also, the run times I’ve been speaking of are for product only. We have some equipment tests that we also run daily, vacuum leak test, DART, etc. How do I include these in my calculations? I am thinking that they should be counted as “setup”, some might argue it is planned PM. The tests are compulsary by industry regulations.
What do folks think about this approach and how do I fill the gaps? I’d like to keep data collection as simple as possible.
Thanks,
Carl
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