The assembly time of a certain mechanism is a v.a. uniform in the range of 40 to 60 seconds. Determine: a. The expected time (in hours) to assemble 4000 parts
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The assembly time of a certain mechanism is a v.a. uniform in the range of 40 to 60 seconds. Determine:
a. The expected time (in hours) to assemble 4000 parts.
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- The assembly time of a certain mechanism is a v.a. uniform in the range of 30 to 60 seconds. Determine:a. The expected time (in hours) to assemble 9000 parts(a) T. Smunt Manufacturing Corp. has the process displayed below. The drilling operation occurs separately from and simultaneously with the sawing and sanding operations. The product only needs to go through one of the three assembly operations (the assembly operations are "parallel"). ASSEMBLY SAWING SANDING 78 min/unit 15 min/unit 15 min/unit WELDING ASSEMBLY DRILLING 25 min/unit 78 min/unit 27 min/unit ASSEMBLY 78 min/unit 1. Which operation is the bottleneck? 2. What is the throughput time for the overall system? 3. If the firm operates 8 hours per day, 22 days per month, what is the monthly capacity of the manufacturing process? 4. Suppose that a second drilling machine is added, and it takes the same time as the original frilling machine. What is the new bottleneck time of the system? 5. Suppose that a second drilling machine is added, and it takes the same time as the original drilling machine. What is the new throughput time?A Jack-in-the-box toy includes two components, the jester (part A) and the box (part B). The following flowchart demonstrates its manufacturing process. Production of Part A A.1 A.2 C.1 C.2 B.1 B.2 В.3 Production of Part B Final assembly It takes two steps, A.1 and A.2, to make part A, performed by two dedicated workstations, respectively: A.1 has a process time of 3 minutes; A.2 has a process time of 8 minutes. It takes three steps, B.1, B.2, and B.3, to make part B, performed by three dedicated operators, respectively: B.1 has a process time of 5 minutes; R2 hac a nrocece timo of 8 minutoe
- An assembly line is to be designed to operate 13 hours per day and supply a steady demand of 325 units per day. Here are the tasks and their performance times: TASK PRECEDINGTASKS PERFORMANCE TIME (SECONDS) TASK PRECEDINGTASKS PERFORMANCETIME (SECONDS) a — 48 g d 43 b — 58 h e 38 c — 73 i f 23 d a 63 j g 33 e b 88 k h, i 53 f c 23 l j, k 67 A) What is the efficiency of your line balance? B) Suppose demand increases by 10 percent. How would you react to this? Assume that you can operate only 13 hours per day in regular time. (Round your answers to the nearest whole number.)An assembly line has 10 serial stations with process times of 1, 2, 3, 4,..., 10 respectively. The process time of the system is: a) 550% of its process cycle time. b) 18.18% of its process cycle time. c) 50% of its process cycle time. d) 100% of its process cycle time.A worker walks 3 steps, bends over to pick up a heavy box (then arises again), walks 8 more steps and forcefully jams the box into a tight opening between other heavy boxes. A B G A B P A
- The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company's policy is a 25% allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with further calculations.) Element Grasp and place bag Fill bag Seal bag Place bag on conveyor * Bag breaks open; included as delay in the allowance factor ^ Conveyor jams; included as delay in the allowance factor a) The standard time for this process = Performance Rating 115% 85% 105% 90% seconds (round your response to two decimal places). 1 8 37 15 9 Observation (seconds) 2 10 42 18 5 3 7 40 14 9 4 12 34 21 31^ 5 8 114* 18 36^The following diagram represents a process where two components are made at stations A1 and A2 (one component is made at A1 and the other at A2). These components are then assembled at station B and moved through the rest of the process, where some additional work is completed at stations C, D, and E. Assume that one and only one person is allowed at each station. Assume that the times given for each station represent the amount of work that needs to be done at that station by that person, with no processing time variation. Assume that inventory is not allowed to build in the system. What is the average hourly output of the process when it is in normal operation?In each of the following, name the term defined or answer the question. Answers are listed at the bottom.1. Goldratt suggests that a production system should be controlled using these three mechanisms.2. A bottleneck should have this placed in front of it to ensure it never runs out of work.3 A rope is used for this purpose in controlling a production system.4. To pace the production system, this is used.5. This is a measure of the value of inventory and the time it stays within an area.
- There are six wires which need to be attached to a circuit board. A robotic device will attach the wires. The wires can be attached in any order, and the production manager wishes to determine which order would be fastest for the robot to use. Use the multiplication rule of counting to determine the number of possible sequences of assembly that must be tested. (Hint: There are six choices for the first wire, five for the second wire, four for the third wire, etc.)The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company's policy is a 25% allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with further calculations.) Element Grasp and place bag Fill bag Seal bag Place bag on conveyor Performance Rating 110% 80% 110% 95% 1 8 35 14 9 *Bag breaks open; included as delay in the allowance factor ^ Conveyor jams; included as delay in the allowance factor a) The standard time for this process = Observation (seconds) 2 9 40 18 5 3 9 39 14 8 4 10 35 19 30^ seconds (round your response to two decimal places). 5 8 112* 18 34^Consider the following production parameters: Machinery time S = 3 minutes Quantity per shift Q =300 units %3D Actual performance =E = 0.96 The shift duration H= 8 hours Reliability = 0.85 How many machines (F) are required? 4 3. 1