5.1.
Calculating OEE
The next step after collecting the data is to measure the OEE which will gives an indication of where we may find the error or the weakness point, the calculation of OEE will depend on 4 main equation the first one used to calculate the availability and from the table 2 and 3 we can find out how much time the line was down and how much is the operating time and then we can use the equation (2) to find out the availability of the production line. The study was taking during 15 days in September 2007, all the days was normal working days and the holidays and weekends are not considered in the study; but if we want to calculate them there were 4 weekend only which extend the study period to 19 days, so the theoretical operating time will be 19 days * 24 hours/days = 456 hours, and the available operating time will be 19 days – 4 days = 15 days. And there are two shifts only with 10 working hours per shift which make the available operating time is equal to 15 days * 2 shift/day * 10 hours/shift = 300 hours. And there is stoppage/pause one hour per day for 1 hour, which gives in total 15 hours 300 – 15 = 285 hours available operating time.