How to calculate OEE with mixed output?

Q: Our machine can run mixed output, so several different products, each shift. Till now we just recorded the time the machine was running and the output we had. Our software now requires that we register activities and quantities to account for every minute in a shift. But we are not tracking the number of minutes it ran each product.
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OEE & Multiple Cycle Times

Q: We have lathes and machining centers that we use where we have multiple set ups and many different parts  with multiple cycle times run on those machines. We will be applying OEE to these machines and I am curious what others have done when the cycle time for the parts always changes. When a process has a constant cycle time, Performance measures also remain constant. Averaging cycle times will not provide accurate information.

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Include Load/Unload in Cycle time?

Q: At my company we are currently doing a book study using your book ‘OEE for the Production Team‘. As we work through the book we came across a question; When calculating OEE do you (the calculation) account for the loading and unloading of material in the machine? We have been calculating the OEE using TAKT time (19 seconds) but the machine cycle time is only (13 seconds). Is this important? Because if there is improvement it will be realized in both versions, correct? In Chapter 9 the exercises do not include load/unload time. Your feedback would be appreciated since material loading is a fundamental function in our facility.
Thank you, Pat Holden

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