APUNTS Operations Tema 4.3 &.docx

Working at 100 capacity in wa implies to increase

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- Working at 100% capacity in WA implies to increase inventories of intermediate products. Case B - A bottleneck work centre (WB) supplies components to a non bottleneck work centre (WA) WB WA. - The demand is 1.000 units /period. - Although WA has double capacity, only it can use 50% to process the 500 units that arrive from bottleneck WB.
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Case C - Two independent work centres, one bottleneck (WB) and the other non-bottleneck (WA), supply components to the final assembly (WM). - The market demand is 1.000 units/period. - 500 units arrive from WB and 1.000 units from WA arrive at the assembly centre (WM). - Although WM can process 1.000 units, it only can assembly 500 units, because this is the flow that arrives from WB. - Sales will only be 500 units. Other 500 units compose the inventory of intermediate products Rule 3 : The usage and activation of a resource are NOT the same thing. Using a resource means its usage so that the system reaches the GOAL. When we use resources, it means that we make good decisions, so that we are closer to the actual goal that’s its earn money. Activating a resource implies its performance without considering the profits. We also say that we activate resources, it means that we do it without getting closer to your goal. If a non-bottleneck resource is working at 100% capacity, no additional sales will be obtained with respect to the maximum capacity of the constraint of the system. In this case, the GOAL is NOT closer because inventories and operating expenses are increasing). Resources are activated but not correctly used. Rule 4 : An hour spent in a bottleneck is an hour lost by the whole system. Bottlenecks determine the production flow. The local constraint transforms in a global constraint of production. If the bottleneck resource looses one hour, this hour is lost by the whole system. This bottleneck resource determines the production that can be achieved. A limitation can be a
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worker, a partner, break down, unpunctuality, so we are not working in the maximum number of our minimum, in this case 6 units per hour, and not lower than that. So if we do less that our minimum, our maximum speed of the limitation will affect the whole system. Rule 5 : Additional capacity in a non-bottleneck resource is a mirage . A capacity increase obtained in a non-bottleneck resource does NOT increase the production capacity of the system. The production that can be obtained is determined by the bottleneck resources. DBR solution In this case limitation is in W4. Drum is going to represent the rhythm and the speed on which we are going to work, so the production goes right if the limitation marks the whole rhythm of the hole production speed. It’s not easy to interchange the work stations. Rope: means that the non-bottleneck resources are going to work to the rhythm of W4, that’s the limitation.
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