63873-Ch14 - Single Station-3e-S 7-17, 17/06, 06/04/07...

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Single Station-3e-S 7-17, 17/06, 06/04/07 Chapter 14 SINGLE STATION MANUFACTURING CELLS REVIEW QUESTIONS 14.1 Name three reasons why single-station manned cells are so widely used in industry. Answer : The reasons given in the text are the following: (1) It requires the shortest amount of time to implement. (2) It requires the least capital investment of all manufacturing systems. (3) Technologically, it is the easiest system to install and operate. Its maintenance requirements are usually minimal. (4) For many situations, particularly for low quantities, it results in the lowest cost per unit produced. (5) In general, it is the most flexible manufacturing system with regard to changeovers from one part or product style to the next. 14.2 What does the term semi-automated station mean? Answer : As defined in the text, a semi-automated station is a machine that is controlled by some form of program during a portion of the work cycle, and the worker’s function is simply to load and unload the machine each cycle, and periodically change cutting tools. 14.3 What is a single-station automated cell? Answer : A single station automated cell is a fully-automated machine capable of unattended operation for a time period longer than one machine cycle. A worker is not required to be at the machine except periodically to load and unload parts or otherwise tend it. 14.4 What are the five enablers that are required for unattended operation of a single-model or batch-model automated production cell? Answer : As given in the text, the five enablers of unattended operation for a single-model or batch-model automated production cell are the following: (1) a programmed cycle that allows the machine to perform every step of the processing or assembly cycle automatically; (2) a parts storage subsystem and a supply of parts that permit continuous operation beyond one machine cycle; (3) automatic transfer of workparts between the storage system and the machine (automatic unloading of finished parts from the machine and loading of raw workparts to the machine); (4) periodic attention of a worker who performs the necessary machine tending functions (e.g., parts loading and unloading of the storage subsystem) for the particular processing or assembly operation; and (5) built-in safeguards that protect the system against operating under conditions that may be unsafe or self-destructive to itself or destructive to the work units being processed or assembled. 14.5 What are the additional three enablers that are required for unattended operation of a mixed-model automated production cell? Answer : As given in the text, the three enablers of unattended operation for a mixed-model automated production cell are (1) a work identification subsystem that can distinguish the different starting work units entering the station, so that the correct processing sequence can be used for that part or product style; (2) a program downloading capability to transfer the machine cycle program corresponding to the identified part
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63873-Ch14 - Single Station-3e-S 7-17, 17/06, 06/04/07...

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