APUNTS Operations Tema 4.3 &.docx

Buffer the actions that will assure that we work at 6

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Buffer: the actions that will assure that we work at 6 units per hour and not lower, at least the minimum. 1. Identification of bottlenecks: Comparison between the work load of the production program and the capacity of each of the productive resources. The resource whose capacity is equal or lower than the work load is the bottleneck. Delimitation is work station C. Work stations F and G must work at same speed, because it joints at A and we will get intermediate stocks, we don’t want to. Buffer 1: works at least 6 units per hour, and we consider that it does not stop. Also have a buffer to avoid random phenomena. Buffer 2: works on parallel with respect to the one that its limitation.
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2. Programming of bottlenecks (C): Once bottlenecks are identified, the production program is modified according to its capacity limitations. 3. Programming of work centres after the bottleneck and those that use components from bottleneck (A, B): These work centres are critical because the material flow is conditioned by the one received from the bottleneck resource. This resource pushes production forward. 4. Programming of work centres before the bottleneck and those that supply material (D, E): The programming of these resources takes into account the programming of bottlenecks. It would be very harmful a bottleneck resource is NOT feed with material. A buffer is established to protect it against stock break. 5. Programming of non-bottleneck resources that process materials that will be assemblied with other components from bottlenecks (F & G): Lack of material from these work centres (F & G) would cause delivery delays in work centre A. Buffer 2 is established to decrease probability of these delays. Quality implications More tolerant than JIT systems Excess capacity throughout system Except for the bottleneck Quality control needed before bottleneck Terminology - Capacity is the available time for production. - Bottleneck is what happens if capacity is less than demand placed on resource. - Non-bottleneck is what happens when capacity is greater than demand placed on resource. - Capacity-constrained resource (CCR ) is a resource where the capacity is close to demand placed on the resource.
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- Setup time is the time that a part spends waiting for a resource to be set up to work on this same part. - Process time is the time that the part is being processed. - Queue time is the time that a part waits for a resource while the resource is busy with something else. - Wait time is the time that a part waits not for a resource but for another part so that they can be assembled together. - Idle time is the unused time that represents the cycle time less the sum of the setup time, processing time, queue time, and wait time
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