NEW GOM3-SUPPLEMENT AND EXERCISE培训教材.pptVIP

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NEW GOM3-SUPPLEMENT AND EXERCISE培训教材.ppt

* 硬商品买卖在阿里巴巴 软商品交易在阿里巧巧 * 硬商品买卖在阿里巴巴 软商品交易在阿里巧巧 GOM3 Exercise Question: The model J Wagon is to be assembled on a conveyor belt. Five hundred wagons are required per day. Production time per day is 420 minutes, and the assembly steps and times for the wagon are given in the following Exhibit. Assignment: find the balance that minimizes the number of workstations, subject to cycle time and precedence constraints. TASK TASK TIME IN SECONDS DESCRIPTION TASKS THAT MUST PRECEDE A 45 Position rear axle support and hand fasten four screws to nuts. -- B 11 Insert rear axle A C 9 Tighten rear axle support screws to nuts B D 50 Position front axle assembly and hand fasten with four screws to nuts -- E 15 Tighten front axle assembly screws D F 12 Position rear wheel #1 and fasten hubcap. C G 12 Position rear wheel #2 and fasten hubcap. C H 12 Position front wheel #1 and fasten hubcap. E I 12 Position front wheel #2 and fasten hubcap. E J 8 Position wagon handle shaft on front axle assembly and hand fasten bolt and nut F, G, H, I K 9 Tighten bolt and nut J 195 1. Draw a Precedence Diagram. A B C F J D E H I G K 45 sec 50 sec 11 sec 15 sec 9 sec 12 sec 12 sec 12 sec 12 sec 8 sec 9 sec 2. Determine workstation cycle time. Here we have to convert to seconds because Our task time are in seconds 3. Determine the theoretical minimum number of workstations required (the Actual number may be greater. A B C F J D E H I G K 45 sec 50 sec 11 sec 15 sec 9 sec 12 sec 12 sec 12 sec 12 sec 8 sec 9 sec WS1 WS2 WS3: B,E,C,F WS4: G,H,I,J WS5 TASK NUMBER OF FOLLOING TASKS A 6 B or D 5 C or E 4 F,G,H or I 2 J 1 K 0 4. Select assignment rules a. assign tasks in order of the largest number of following tasks b. assign tasks in order of longest task time 5. Make task assignments to form Workstation 1, Workstation 2….. 6. Calculate efficiency: assume 5 first? 7. Evaluate the solution. An efficiency of 77 percent indicates an imbalance or idle time of 27 percent across

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