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
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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
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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.(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
- Suppose a final assembly is produced by assembling two components. THE The first component, A, is produced internally and goes through three process steps, which are stamping, forging and machining, with scrap estimates of 10%, 15% and 25%, respectively. For every three produced units of component A, two are used in the final assembly and one is separate to meet spare parts needs. The second component, B, which is used exclusively in final assembly, is purchased from a supplier external and inspected on arrival; 2% do not pass inspection. A unit of the component purchased is required for each final assembly. The final assembly process produces 5% of scraps. Spare parts demands for component A and final Su assembly match to 1,000 and 5,000 units, respectively. How many input units are needed for produce component A, and how many units of component B should the firm buy?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.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?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 AAn 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.)
- c) Compute the net quantities needed if there are 25 of the base and 75 of the clamp in stock. Base: ? Spring: ? Clamp: ? Housing: ? Handle: ? Casting: ? Bearing: ? Shaft: ?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^