Homework 6a Operations

Justin pack rat Chapter 6A 3, 4, 9, and 14 3) a. b. one shot season = drudgery term per sidereal day/ needed output per day = (8 moment/day)(3600 seconds/hour)/240 units per day = 120 seconds per unit c. change by reversal set problem confinement condemnation slack magazine I AD 6050 10 II BC 8020 20 trinity EF 9030 0 IV GH 3060 30 d. Efficiency = Task fourth dimension / move X avg. cycle judgment of conviction) = = . 875 or 87. 5% 4) a. A B F C D E G 30 35 15 65 H 30 35 40 25 A B F C D E G 30 35 15 65 H 30 35 40 25 b. What is the work commit cycle time? Cycle time = production time per day/required output per day Cycle time = 27000 / 360 = 75 seconds. . Calculate this rest line employ the largest hail of following assigns. spend the drawn-out task time as a secondary criterion. 275 / 75 = 3. 66 thither should be a minimum of 4 work stations Work station Task Task time Idle time I ACE 303015 0 II BD 3535 5 III F 65 10 IV GH 4025 10 d. What is the efficiency of your parallelism line? 91. 7% 9. A B F C D E G 20 7 15 10 H 20 22 16 8 A B F C D E G 20 7 15 10 H 20 22 16 8 a. Cycle time = production time per day/required output per day Cycle time = 25200 / 750 = 33. 6 seconds. b. What is the theoretical number of workstations? workstations = sum of task measure / cycle time 118 / 34 = 3. 5 There is a minimum number of 4 workstations. c. form the precedence diagram d. Balance the line using sequential restrictions and the longest-operating time rule. Work station Task Task time Idle time workable Rem. T. Tasks w/ most foll Task w/ longest t. I AB 207 147 B B B II DF 2210 122 F F F III C 20 14 IV EG 1516 193 G G G V H 8 26 e. What is the efficiency of the line balanced as in d? Efficiency = Sum of task times / ( workstations X Cycle time) = 118 / (5 X 34) = . 70Efficiency = 70% f. Suppose that demand bloom from 750 to 800 units per day. What would you do? yield any amounts or calculations. New cycle time = 25200/800 = 31. 2 se conds Reduce cycle time to 31 seconds and work 62-3 minute overtimes. g. Suppose that demand rose from 750 to 1000 units per day. What would you do? Show any amounts or calculations. New cycle time = 25200/1000 = 25. 2 seconds 1. 89 hours overtime may be remedy to rebalance. 14) Develop two alternative layouts. What is the efficiency of your layouts? A B F C D E G 1 1 3 1 H 2 1 1 2 1 I A B F C D E G 1 1 3 1 H 2 1 1 2 1 I Cycle time = 4 minutesWhat is the theoretical number of workstations? workstations = sum of task times / cycle time 13 / 4 = 3. 25 Work station Task Task time Idle time Feasible Rem. T. Tasks w/ most foll Task w/ longest t. I ABC 11 2 32 0 B,F C,D B C,D B,F C IIIIIIV DEFGHI 131121 303203 EGH EGH EGH Work station Task Task time Idle time Feasible Rem. T. Tasks w/ most foll Task w/ longest t. I AFG 11 1 32 1 B,F G B G B,F G IIIIIIV BCDEHI 311321 313021 C,DEI C,DEI C,DEI