Sola communications has redesigned one of its core business processes. processin
ID: 351601 • Letter: S
Question
Sola communications has redesigned one of its core business processes. processing times are not expected to vary significantly, so management wants to use the line-balancing approach to assign activities to workstations. the process has 11 activities, and the market demand is to process 4 jobs per 400 min working day. Table below shows the standard time and immediate predecessors for each activity in the process.
a. construct a precedence diagram.
b. calculate the cycle time corresponding to a market demand of 4 jobs per day.
c. what is the theoretical minimum number of workstations?
d. use the longest activity time rule as the primary rule to balance the line.
e. what is the efficiency of the line? how does it compare with the theoretical maximum efficiency?
f. is it possible to improve the line’s efficiency? can you find a way of improving it?
Activity Time (Mi Immediate Predecessor 70 15 32 47 25 61 52 29 42 C, D, G B,E G, H E JExplanation / Answer
PLEASE FIND ANSWERS TO FIRST 4 QUESTIONS ( a, b , c, d ) AS WELL AS FIRST PART OF QUESTION e :
The Precedence diagram as follows :
Available time = 400 minutes per day
Demand per day = 4 jobs
Therefore , cycle time = 400 / 4 = 100 minutes per job
Total duration of all activities
= 70 + 15 + 8 + 32 + 47 + 25 + 61 + 52 + 29 + 42 + 50
= 431 minutes
Minimum number of workstations = Total duration of all tasks/ Cycle time = 431 / 100 = 4.31( 5 rounded to next higher whole number )
CYCLE TIME = 100 MIUTES PER JOB
MINIMUM NUMBER OF WORKSTATIONS = 5
Arrangement of workstations basis longest operating time rule is done in such a way that total duration of tasks in any workstation shall not exceed cycle time of 100 minutes. Arrangement of workstations accordingly as follows :
TOTAL DURATIION ( MINUTES )
70 + 15 + 8 = 93
G, I
61 + 29 = 90
32 + 47 = 79
25 + 42 = 67
E)Efficiency of the line =Total duration of all tasks / ( actual number of workstations x Cycle time )x 100
= 431 / ( 6 x 100)x 100
= 7 1.83 %
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