Sunday, May 16, 2010

Assembly Line Balancing - Steps Involved in Assembly Line Balancing

Line Balancing is the process of assigning tasks to workstations in such a way that the workstations have approximately equal time requirements. Assembly line can be efficient only when tasks are assigned to different workstations in such a way that total processing time at these work stations are equal.

Objective of assembly line balancing is to minimize the imbalance among workstations while trying to achieve a desired output rate. So either, one can minimize the number of workstations for a given production rate or maximize the production rate for a given number of workstations.

The time for which a basic structure of the product is available before a workstation is called the cycle time. Cycle time is defined as the time period after which complete units come of the conveyor.

Determine Maximum Output 

OT (Operating per day)
CT (Cycle time)
D (Desired time)

Cycle Time= OT/D
Output capacity= OT/CT

Steps Involved in Assembly Line Balancing
  1. Draw the precedence diagram
  2. Determine the required cycle time (c)
  3. C=(Production time/day) /Output per day (in units)
  4. Determine the theoretical no of work stations (Nt = Sum of the task times/cycle time)
  5. Select a rule which tasks are to be assigned to work stations and a secondary rule to break the ties.
  6. Efficiency = Sum of the tasks times/[ actual no of workstations x Cycle time ]
  7. Balance delay =1-Efficiency


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