Calculate OEE per hour

Q: Suppose I want to calculate OEE per hour, continuously during the running shift, in order to present the team an ongoing status, how should I calculate this, specially when the machine is not running? Does the OEE drop to zero?

What if the Availability has been 50% for last hour but the actual production has been zero? What do you do with the Performance number? Should it be equal to zero?

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Spillage

Q: Should spillage be considered in OEE calculation?

Let’s say I’m producing 90 pieces instead of an expected 100. Then my OEE should be 90/100 = 90%. But now consider the conveyor is faulty because of which 10 pieces got spilled (without stopping the line). These 10 pieces spillage are waste as those can’t be use as finished goods. So 90-10 = 80 is my actual output now. In this case, my OEE should be 80/100 = 80% right?

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Quality Rate can not be determined immediately

Q:  Sometimes our process is being interrupted; i.e. the oven is stopped at a different moment than planned. At that moment it is not clear whether the product will be OK or not. We will block the product and take samples to determine the quality. This could take a couple of days. Wen everything is OK the product is released, otherwise it is being scrapped. This would have a retrospective effect on the OEE I guess? A correct quality rate -and thus OEE- for the day is no longer possible in this way. What number should I now use?

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OEE in long-run milling process

Q: We are tool & die maker for  the automotive industry. Overall each die will take 20 to 35 days (based on size) to complete. Depending on the shape (contour) of the die, the process is done manually or auto mode. The mode depend on our CAD/CAM capability to do the programming.

How do we calculate OEE in our milling process?

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How to set Availability Definitions (1)

Q: What are the time effects of the situations below to the availability and OEE calculation?

  1. Excise tax checking time (60 per shipment)
  2. Machine cleaning time for the quality of product. (10 min every hr.)
  3. External factory Electrical failure time. (uncontrollable)

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No information to determine the maximum speed definition…

Q: Our textile printing machine runs different products (fabric type along with number of printing colors). We don’t have any information to determine the maximum speed against each type of product (fabric type, number of colors etc.).

How can I define the maximum (Theoretical) speed of my machine when no manufacturer data is available?

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