Overall equipment effectiveness: Analysis of different ways of calculations and improvements

Abstract

An Overall Equipment Effectiveness (OEE) indicator is one of the most often used indicators, especially in large companies, to assess the level of the successful utilization of equipment. Many companies still do not calculate OEE, although the procedure of the OEE calculation is well known. On the basis of the literature review and from companies practice, it occurs that different methods of the OEE assessment are used. It is because companies identify different disturbances which influence the OEE value. The authors summarized these disturbances. In the paper, two case studies concerning the OEE calculations from manufacturing companies are presented. On the basis of the first company, it is shown how the Total Productive Maintenance (TPM) implementation may improve the value of OEE. On the base of the other company, the way the OEE calculation procedure can be improved and the results of the calculation procedure modification are presented. Finally, the authors propose to introduce weights to differentiate the influence of different OEE components. The results of the new procedure implementation are presented in the paper.