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CH_15_10th_Edition

# CH_15_10th_Edition - JIT and Lean Operations CHAPTER 15...

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JIT and Lean Operations CHAPTER 15 LEAN OPERATIONS PROBLEMS P1. In the course of manufacturing sunglasses, workstation K must attach the lenses to the frame; lenses come from workstation J. These are the nonprescription type of sunglasses which may be bought off of the rack at the drugstore and this problem is concerned only with the lenses, not the frames. Management has scheduled the production of 160 sunglasses per 8-hour shift. Workstation J requires 3.0 minutes to produce a pair of lenses (left and right); once in a while a pair of lenses is defective, and management allows .20 for inefficiencies. The finished lenses are placed in containers of a dozen pairs each. When workstation K opens a container of lenses, it sends the kanban back to station J which takes 15 minutes, it takes 15 minutes for a container to be transported from station J to station K. a. What is the value of D? b. What is the value of T? c. What is the value of X? d. What is the value of C? e. How many kanban cards (or containers) should be used in this system? P2. One step in the manufacture of tennis rackets consists of weaving the cross strings into the head of the racket. This task requires a high level of skill and experience, and is slow. In workstation G, six skilled weavers work on tennis rackets; on the average, it takes 45 minutes for one weaver to weave a tennis racket. The head of the racket is produced by a supplier who has been certified; the supplier is located in Portland. OR, while the manufacturer is located in Los Angeles, CA, a distance of about 1,000 miles. Tennis racket heads are shipped by truck from Portland to Los Angeles; each truckload contains six dozen heads and the trip takes two days, i.e., the truck leaves Portland on the morning of the first day (say Monday) and arrives in Los Angeles on the evening of the second day (Tuesday); the racket heads are available for weaving on the morning of the third day (Wednesday). When any weaver opens the shipment, the kanban is sent to the

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