# SPC, Downtime, and Overall Equipment Effectiveness

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Thanks so much for reading our publication. We hope you find it informative and useful. Happy charting and may the data always support your position.

Sincerely,

Dr. Bill McNeese
BPI Consulting, LLC

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• AnonymousDecember 30, 2011

Thank you for articles written this year. They are written at a level of understanding accessible, which is very good. Practically every article made ​​me remember the fundamentals of SPC, at least, if you have taught me something new.
For 2012, I wish you a happy New Year, with many interesting articles.
Nicholas DARABAN

• AnonymousDecember 31, 2011

Thanks for your excelent articles during these years. They are very effetive.

Lafayette U Tenorio

• AnonymousJanuary 5, 2012

Performance efficiency in unit lbs/hours or as %?

In table 2 the Performance efficiency is stated in units lbs/hours uptime, and not as % of Best Run Rate. This must have confused the author, and consequently give wrong results for the OEE chart. The average OEE is 7.96%, not 79.6%. Recalculate column 8 (Perfomance efficiency) to % of Best Run Rate before calculation of OEE in column 9. I think that OEE cannot be larger than 100% (see days 6 and 13)!

Best regards
Helge Karlsson

• billJanuary 5, 2012

Performance efficiency is a % given as:

% Performance Efficiency = 100(Run Weight/Uptime)/(Best Run Rate)

where Best Run Rate has the same units as Run Weight/Uptime. So, if run weight is in lbs and uptime is in hours, the best run rate is also in lbs/hour. In the example, the best run rate is 1000 lbs per hour. If you run higher than this, the %PE can be greater than 100. So, OEE can be greater than 100 also.

I think what confused the situation is that the lbs product (and lbs rework/scrap) had a zero left off their data in Table 2. That has been corrected as of today (1/5/12).