Essay on Operation Management - 1571 Words

| Cleaning Time | Waxing time | C1 | 9 | 6 | C2 | 6 | 2 | C3 | 5 | 7 | C4 | 3 | 5 | C5 | 8 | 4 | 41. (7 points) An automobile detailing shop has the following jobs waiting to be processed. All jobs (cars requiring detailing) must first be cleaned, then waxed. a. What processing sequence will minimize the makespan for these jobs? Job | Cleaning Time time | Cleaning Time end time | Waxing time time | Waxing time end time | Waxing time idle time | C4 | 3 | 3 | 5 | 8 | 3 | C3 | 5 | 8 | 7 | 15 | 0 | C1 | 9 | 17 | 6 | 23 | 2 | C5 | 8 | 25 | 4 | 29 | 2 | C2 | 6 | 31 | 2 | 33 | 2 | b. What is the minimum makespan for this set of five jobs? Makespan is 33 (POM SW output is attaced in excel) 42. (10 points)†¦show more content†¦Sample Mean Range Sample | Mean | Range | 1 | 7.2 | 0.7 | 2 | 7.6 | 1 | 3 | 7.1 | 1.4 | 4 | 7.8 | 1.1 | 5 | 7.8 | 0.6 | 6 | 7.5 | 1.2 | _ a. Calculate the 3 X-chart and R-chart control limits. X bar = Average (Mean) = (7.2+7.6+7.1+7.8+7.8+7.5) / 6 = 7.50 Avge Range R bar = Avge (Range) = (0.7+1+1.4+1.1+0.6+1.2) / 6 = 1.00 Using Constant Table, we find the value of A2 for Subgroup of n=6 as A2 = 0.483 Now Upper control Limit UCL(X) = X + A2*R = 7.50+0.483*1 = 7.983 amp; Lower control Limit LCL(X) = X - A2*R = 7.50 - 0.483*1 = 7.017 Now we calculate the Upper Control Limit for Range. Recall that when n lt;7, LCL( R) = 0. Here n=6. So LCL(R) =0 amp; UCL (R ) = D4*R Looking up Contant Table, we find for n=6, D4 = 2.282 So UCL (R ) = D4*R = 2.282*1 = 2.282 b. Calculate the mean (X) and range (R) for the following sample, which was taken from the same process at a later time. Item number: 1 2 3 4 5 Weight: 7.5 8.0 8.2 7.5 7.4 Mean (X) = Avge(Weights) = (7.5+8.0+8.2+7.5+7.4) / 5 = 7.72 Range (X) = Highest Value of Weight – Lowest value of weight = 8.2-7.4 = 0.8 Based on this sample and the control chart limits that you calculated in part (a), is the process in control? Why or why not? Based on X amp; R UCL amp; LCL found in (a ), we can say that Process is in Control. This is because, all Mean of samplesShow MoreRelatedOperations Management : Operation Management1355 Words   |  6 PagesOperations Management Introduction Operations management is the activity of managing the resources that create and deliver services and products. The operations function is the part of the organization that is responsible for this activity. Every organization has an operations function because every organization creates some type of services and/or products. However, not all types of organization will necessarily call the operations function by this name. Operations managers are the people who haveRead MoreOperation Management - Cadburyworld2493 Words   |  10 Pagestechnology to streamline the operation process) and facility costs (old and outdated facilities) at lowest possible. In return, they have to compromise low costs with their other objectives. 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