Once you have established a robust OEE system, you should also be reaping benefits in other areas of your organization.
We will be offering some insights into the other performance metrics such as inventory over the next few weeks. Improved availability, performance, and quality will all have an impact on your inventory and materials management processes. Inventory turns is one metric that should be improving as your OEE improves. If not, perhaps there is an opportunity to integrate OEE even deeper into your organization.
In a truly lean organization, other vantage point metrics will provide evidence of a well integrated OEE system. Metrics such as delivery, quality (ppm), labour efficiency, lead time, mean time between failures, mean response times, down time, turn over, and financial performance indicators are all directly or indirectly affected by improvements to your operation and OEE.
We will discuss the impact of OEE on these “other” metrics over the next few posts. Remember, we also offer excel templates at no cost to you. Click on the “BOX” files on the sidebar to get your free templates today! Our templates offer more than a simple OEE calculator – they can be used immediately with little or no modifications to suit your processes.
Until next time, STAY lean!
Vergence – Lean Execution Team.
Many articles written on OEE (ours being the exception), indicate or suggest that the quality factor for OEE is calculated as a simple percentage of good parts from the total of all parts produced. While this calculation may work for a single line part number, it certainly doesn’t hold true when attempting to calculate OEE for multiple parts or machines.
OEE is a measure of how effectively the scheduled equipment time is used to produce a quality product. Over the next few days we will introduce a method that will correctly calculate the quality factor that satisfies the true definition of OEE. The examples we have prepared are developed in detail so you will be able to perform the calculations correctly and with confidence.
Every time a part is produced, machine time is consumed. This time is the same for both good and defective parts. To correctly calculate the quality factor requires us to start thinking of parts in terms of time – not quantity.
If the cycle time to produce a part is 60 seconds, then one defective part results in a loss of 60 seconds. If 10 out of 100 parts produced are defective then 600 seconds are lost of the total 6000 seconds required to produce all parts. Stated in terms of the quality factor, 5400 seconds were “earned” to make quality parts of the total 6000 seconds required to produce all parts (5400/6000 = 90%). Earned time is also referred to as Value Added Time.
As we stated earlier, for a single line item or product, the simple yield formula would give us the same result from a percentage perspective (90 good / 100 total = 90%). But what is the affect when the cycle times of a group or family of parts are varied? The yield formula simply doesn’t work.
The quality factor for OEE is only concerned with the time earned through the production of quality parts. Watch for our post over the next few days and we’ll clear up the seemingly overlooked “how to” of calculating the quality factor.
Until Next Time – STAY lean!
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