Introduction to OEE Utilization data

OEE (Overall Equipment Effectiveness) can help you determine the percentage of time that your planned production time is being fully utilized. OEE is a DMS (Defect Management System) function.

Note: There are a few simple tasks you will need to perform before GainSeeker can properly retrieve OEE data. See OEE Retrieval Prerequisites for details.

The OEE metric percentage is calculated from the percentages of three submetrics: Availability * Performance * Quality.

• Availability

• Performance

• Quality

What OEE can do for you

OEE data can help you:

• Learn if you are getting the most efficiency from your assets.

• Pinpoint times and shifts when production tends to flourish or falter.

• Increase equipment reliability and reduce downtime through planned maintenance rather than reactive repair of equipment when it breaks down.

• Determine actual equipment or process performance relative to equipment or process capability.

• Identify missed opportunities when more first-pass yield could have been produced.

• Increase awareness about first-pass yield among workers who have received training on its merits.

OEE Limitations

• The OEE calculation—OEE= Availability * Performance * Quality—gives equal weight to the importance of each of these metrics. Your organization's goals should be considered when you place more emphasis on one of these metrics over another. For example, increasing your cycle time could raise your Performance percentage, but hamper your first-pass yield (Quality) percentage.

• Increasing the rate of production alone can result in overproduction: overstock, overfill, or too much WIP. Plus, it can lead to lower quality, which defeats the point of OEE: getting the most from your scheduled production time using the assets you have.

• OEE can help you identify areas of constraint, but it does not tell you causes for constraints.

• The focus of OEE should be on preventative maintenance through scheduled downtime instead of increasing the speed at which equipment is repaired.

• OEE is only one indicator of productivity. Using OEE along with DMS and SPC data can help you identify processes that are lagging and help you determine root causes.

What are good OEE numbers?

• See Good OEE percentages

The OEE Formula

OEE is based on this formula: OEE = Availability x Performance x Quality

Availability

Formula: Availability = Actual Operating Time / Planned Production Time (Actual Operating Time divided by Planned Production time)

• See the OEE Availability metric for more information.

Performance

Formula: Performance = Ideal Cycle Time / (Operating Time / Total Units Produced)

• See the OEE Performance metric for more information.

Quality

Formula: Quality = Time to Produce Good parts / Time to Produce Total Parts

• See the OEE Quality metric for more information.

OEE Chart types

• See OEE Chart types