| We have just recently started using the Overall Equipment Effectiveness (OEE) metric on our SMT lines. This measurement is the "equivalent percentage of time the equipment is being used to produce saleable product at the maximum machine rate." The OEE calculation is: | | OEE% = Availability * Performance Efficiency * Rate of Quality | | I am trying to benchmark this metric ... if you are using this metric, I would love to know what OEE levels you are experiencing. If you have any comments on this metric, I would like to hear these as well. | | If you would like some background information on this metric, I have found some information on the web: | | http://www.sematech.org/public/docubase/abstract/2745agen.htm | | A PDF file is available for downloading.
I've used OEE in a couple of different companies each of which approached it differently. I'm not sure why you have the effeciency in the calculation for OEE, since that's what you are trying to get. I always used OEE = (actual # units built * %good)/theoretical # units through constraint in avail. time.
Personnally, I think available time should be the full shift time minus any scheduled downtime. I do not take time out for changeovers, shiftchanges, machines down, part shortages, etc. These are the occurances you are trying to capture, understand and reduce.
This assumes that you know what your real constraint is and it's best case (gross not net) cycle times.
In my experience a good process is in the 70's or 80's, most have started in the 30's to 40's before tracking OEE.
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We have just recently started using the Overall Equipment ...
- Oct 16, 1998
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