51 Measurement cycle

Step 1 Equipment history and performance record

This is the essential prerequisite to the OEE calculation (Step 2) because it records the recent effectiveness of an equipment item. This forms a basis for the problem prevention cycle (see later). Included in this record are:

• data on equipment availability, performance and quality to enable OEE to be calculated;

• records of problems and breakdowns as a basis for problem solving and as evidence of improvements resulting from refurbishment and ongoing asset care;

• measurements and records of pressure, noise, vibration and temperature to show up any adverse trends. Under this heading will come data collection and data analysis from condition monitoring equipment.

All of this information will have a direct bearing on the ongoing asset care and improvement programme.

A typical equipment history record is shown in Figures 5.2 and 5.3, and records of this type will form the basis of the OEE calculation described below.

Step 2 Overall equipment effectiveness

The OEE formula is at the heart of the TPM process. It is soundly based on measurable quantities and enables progress to be quantified as the organization embraces TPM with all its implications. The formula enables calculation of two parameters:

• Actual effectiveness of the equipment, taking into consideration its availability, its performance rate when running and the quality rate of the product produced. All of these are measured over a period.

Total Productive Maintenance Programme

R/H Front Door Line C02 MIG Welding Cell

Material Usage Chart

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