Requirements for collecting OEE data

Special prerequisites and requirements apply when collecting OEE (Overall Equipment Effectiveness) data.

Prerequisites to collecting OEE data

1. Create OEE traceability fields

Use the System Administration module to create five new traceability fields for raw OEE data:

1. Select five consecutive traceability fields (for example, fields 7–11) that are not previously used.

• Start with traceability field 7 or higher. (You cannot use fields 1-6 for OEE.)

2. Assign a label to each of those traceability fields in this order:

• Available Time

• Scheduled Time

• #Good Parts

• #Total Parts

• Ideal Cycle Time

You can change how these labels are worded, but they must represent these five raw data values and be entered in this order. For more information on these values, see New OEE traceability fields.

For detailed instructions on creating traceability labels, see Adding traceability field labels.

2. Change an OEE Statistic setting

Use the System Administration module to designate the first of these new traceability fields for special use as OEE data:

1. In the System Administration module, navigate to this setting:
   
   Configurations tab | configuration name | Statistics | OEE | First of five traceability columns where OEE values are stored =

2. Right-click the First of five traceability columns where OEE values are stored = setting, then choose the new Available Time traceability label.
   
   
   
   Then click OK.

Requirements for entering OEE Data

• Use one of the many GainSeeker data entry options - PC Collect, SPC Data Entry, DMS Data Entry, etc. - to enter OEE data for analysis.

• Store OEE data as DMS data records (not SPC data).

• Important data fields are the Date/Time stamp, the new traceability fields you added (above), and other traceability fields.

• Date/Time stamp
  
  This relates to the frequency of data collection and determines the smallest unit of time that you can use for comparing OEE values - every 5 minutes, every 30 minutes, every hour, every day, etc.
  
  For example: if you want the ability to calculate separate OEE numbers for increments as small as every 30 minutes, then you need to enter data records that are timestamped 30 minutes apart.
  Also, each timestamp should fall within the time period it represents - e.g., for OEE data from 10:00:00 - 10:30:00, the data record should be timestamped between 10:00:00 and 10:29:59.

• New OEE traceability fields

• Available Time: The length of time* that the process was actually producing parts. For example, if you are storing time values in Minutes, and the process ran for 5 hours, then you would enter 300 (the number of minutes). This number should not include any time that the process was unable to produce parts - either for scheduled reasons (see below) or for unscheduled reasons such as machine setup and changeover, equipment malfunction, or material shortages.

• Scheduled Time: The length of time* that the process was scheduled for production. For example, if you are storing time values in Minutes, and the process was scheduled to run for 8 hours, then you would enter 480 (the number of minutes). Any scheduled downtime - preventive maintenance, employee lunch breaks, etc. - should not be included.

• #Good Parts: The number of parts that were produced without defects (first-pass yield). Reworked parts should not be included.

• #Total Parts: The total number of parts produced within the set time period (good parts and bad parts).

• Ideal Cycle Time: The length of time* to produce one part, when the process is running as fast as it was designed to perform. For example: if you are storing time values in Minutes, and your process is designed to produce 240 parts per hour, which is 4 parts per minute, or 1 part every 15 seconds, then you would enter 0.25 (the number of minutes to produce one part).

* The Available Time, Scheduled Time, and Ideal Cycle Time must all be entered with the same unit of time. Minutes are most common, but you can use Seconds, Hours, etc. - as long as you use the same unit consistently.

• Other traceability fields
  
  In addition to the OEE-specific traceability fields, your OEE data records can also store information in the other traceability fields. This will allow you to group OEE metrics by other traceability values - e.g., by part family or work order - instead of (or in addition to) analyzing that data by time period.

• (optional) Depending how you enter OEE data, you may also enter "typical" DMS data in these records - sample size, number of good units, number of nonconforming units, defects and counts. The OEE charts will not analyze this information, but you can still use DMS charts to analyze this data.
  
  In particular, consider setting up defects for Availability issues such as machine setup and changeover, equipment malfunction, or material shortages. During data entry, you could flag any downtime events with the corresponding defect, and enter the number of downtime minutes for that downtime event as the defect count. This ultimately allows you to perform Pareto analysis on the downtime defects in your OEE data.
  
  You could attempt a similar approach for Performance issues. Or, if these are too difficult to identify (and they often are), you could still set up a "Performance Loss (Minutes)" defect and enter the number of minutes lost due to slow performance. For every OEE data record, this can be calculated as Available Time - (#Total Parts * Ideal Cycle Time) , with the caveat that this number cannot be less than 0.

See also

• Start creating OEE Charts