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Line Balancing in Operations Management www.mbaknol.com Visit www.mbaknol.com for Management notes and presentations.

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Presentation on theme: "Line Balancing in Operations Management www.mbaknol.com Visit www.mbaknol.com for Management notes and presentations."— Presentation transcript:

1 Line Balancing in Operations Management Visit for Management notes and presentations

2 Definition: Line balancing is the procedure in which tasks along the assembly line are assigned to work station so each has approximately same amount of work. Visit for Management notes and presentations

3 Line Balancing Problem The objective of line balancing is to assign tasks to minimize the workers idle time, therefore idle time costs, and meet the required production rate for the line In a perfectly balanced line, all workers would complete their assigned tasks at the same time (assuming they start their work simultaneously) This would result in no idle time Visit for Management notes and presentations

4 Line Balancing Problem Unfortunately there are a number of conditions that prevent the achievement of a perfectly balanced line The estimated times for tasks The precedence relationships for the tasks The combinatorial nature of the problem Visit for Management notes and presentations

5 Line Balancing Problem Work stations are arranged so that the output of one is an input to the next, i.e., a series connection Layout design involves assigning one or more of the tasks required to make a product to work station. Visit for Management notes and presentations

6 Example of Line Balancing Youve just been assigned the job a setting up an electric fan assembly line with the following tasks: TaskTime (Mins)DescriptionPredecessors A2Assemble frameNone B1Mount switchA C3.25Assemble motor housingNone D1.2Mount motor housing in frameA, C E0.5Attach bladeD F1Assemble and attach safety grillE G1Attach cordB H1.4TestF, G Visit for Management notes and presentations

7 Example of Line Balancing: Structuring the Precedence Diagram Task Predecessors ANone A BABA B CNone C DA, C D Task Predecessors EDED E FEFE F GBGB G HE, G H Visit for Management notes and presentations

8 Kilbridge and Webstor Method Step 1- draw a precedence diagram and arrange them into different zones so that the average time is equal or nearly equal. Visit for Management notes and presentations

9 Line Balancing Problem A B C 4.1mins D 1.7mins E 2.7 mins F 3.3 mins G 2.6 mins 2.2 mins 3.4 mins Visit for Management notes and presentations

10 Here idle time=16.8 idle time %age=(16.8/9.2)X100=182.60% This is not acceptable Visit for Management notes and presentations

11 Step 2- transferability; in this principle the activities are transferred from one zone to another as long as they dont affect the sequence denoted by ordered pair. Step 3- from step 2 and by arranging the work centres, the lines balancing becomes Visit for Management notes and presentations

12 Line Balancing Problem A B C 4.1mins D 1.7mins E 2.7 mins F 3.3 mins G 2.6 mins 2.2 mins 3.4 mins Visit for Management notes and presentations

13 here idle time=4 min idle time %age=(4/6)X100=66.6% Visit for Management notes and presentations

14 Thank You Visit for Management notes and presentations


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