The Ranked Positional Weight Method is a technique used for assembly line balancing that takes into account precedence relationships and task processing times. It involves calculating a Ranked Positional Weight for each work element based on duration and precedence, arranging them in descending order, and then assigning them to workstations to optimize time, machinery, labor and output. The example shows the steps of constructing a precedence diagram, calculating RPW values, ordering by RPW, and assigning elements to six workstations with the goal of minimizing idle time.

1. Ranked Positional Weight
Method
Of Assembly Line Balancing

2. What is an Assembly Line?
Assembly Line is a production layout consisting of a
series of machines and/or workers that perform the
operation required to produce a particular product.

3. What is Assembly Line Balancing?
Assembly Line Balancing is a production technology
that divides the activities of an operation in a way that
enables optimization of time, machinery and labor,
thereby maximizing output.

4. What is Ranked Positional Weight
Method?
It is a method used for line development and
balancing. It takes into account the precedence
relationships as well as processing time of all tasks.

5. Ranked Positional Weight Method Example
Element Duration Precedence
1 5 -
2 3 1
3 4 2
4 3 1
5 6 4
6 5 3,5
7 2 6
8 6 7
9 1 6
10 4 6
11 4 10
12 7 8,9,11
Total 50

6. Step 1: Precedence Diagram
5
4 43 6
5 7
2
50
36 33 15 13
7829
3 4 6
1
38 35 15 11
4
1
2 3
5
6
7 8
9
10 11
12

7. Step 2: Calculate RPW for each work element
Element Duration Precedence Total Ranked Positional Weight
1 5 - 50
2 3 1 36
3 4 2 33
4 3 1 38
5 6 4 35
6 5 3,5 29
7 2 6 15
8 6 7 13
9 1 6 8
10 4 6 15
11 4 10 11
12 7 8,9,11 7
Total 50

8. Step 3: Arrange RPW in descending order
Element RPW Duration Precedence
1 50 5 -
4 38 3 1
2 36 3 1
5 35 6 4
3 33 4 2
6 29 5 3,5
7 15 2 6
10 15 4 6
8 13 6 7
11 11 4 10
9 8 1 6
12 7 7 8,9,11
Total 50

9. Step 4: Assign work elements to workstations
Workstation No. Element Duration Total duration at workstation Idle Time
1
1 5
8 2
4 3
2
2 3
9 1
5 6
3
3 4
9 1
6 5
4
7 2
6 4
10 4
5
8 6
10 0
11 4
6
9 1
8 2
12 7
Total 50

10. Step 5: Evaluation

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