When machines are down for maintenance or repair reasons, we do not use the efficiency percentage but actually adjust the calendar to zero hours for the duration of the maintenance. An efficiency of 85% is considered realistic for human workers. The natural down time has to be taken into account. For example, if I work 8 hours a day according to my contract, the scheduling system cannot assume that I am indeed going to be available 8 hours to do work. It has an obvious purpose to take into account the real world. The efficiency percentage is a field that is found in all MRP/ ERP systems. The business requirements that these features address are well known, and AX 2012 has some very interesting options that are not widely known but that do address some of the requirements precisely. This article provides an explanation of important fields in Microsoft Dynamics AX 2012 that impact the result of production order scheduling in a significant way.
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