第一章 生产运作与管理概述.pptVIP

* * * For the bread-making line, baking is the bottleneck since it has the longest cycle time. The cycle time of each bread-making line is 1 hour/100 loaves. Since there are two lines, the cycle time of bread-making is 1/2 hour/100 loaves, which is shorter than the cycle time of packaging. Thus packaging is the bottleneck of the whole process and the output capacity is 133 loaves/hour (since its cycle time is 3/4 hour/100 loaves). * For the bread-making line, baking is the bottleneck since it has the longest cycle time. The cycle time of each bread-making line is 1 hour/100 loaves. Since there are two lines, the cycle time of bread-making is 1/2 hour/100 loaves, which is shorter than the cycle time of packaging. Thus packaging is the bottleneck of the whole process and the output capacity is 133 loaves/hour (since its cycle time is 3/4 hour/100 loaves). * Resource Utilization Packaging machine 100% Packaging operator 40/45 = 88.9% Mixer 1/2 = 50% Oven 1/(2*0.75) = 66.7% * Resource Utilization Packaging machine 100% Packaging operator 40/45 = 88.9% Mixer 1/2 = 50% Oven 1/(2*0.75) = 66.7% * Assume that there is no waiting, the manufacturing lead time is just the sum of all the processing times, i.e. (3/4)*3 + 1 = 3.25 hours. The actual lead time may be higher when transportation time is significant and there is waiting due to work-in-process (WIP) inventory. * The same as (1) since cooling is not the bottleneck. * The same as (1) since cooling is not the bottleneck. * (a) Increasing the capacity of baking would not change the overall output capacity since baking is not the bottleneck of the process. (b) If the cycle time of packaging is increased to 1/2 hour/100 loaves, packaging would have the same capacity as bread-making. The overall output capacity of the process is now 200 loaves/hour since its cycle time is 1/2 hour/100 loaves. * With a batch size of 100 loaves and a setup time of 15 minutes, the cycle time of packaging is now 1/4 + 3/4 = 1