wait time total non value added time

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31Lead Time

Audio Max Electronics Company manufactures electronic stereo equipment. The manufacturing process includes printed circuit (PC) card assembly, final assembly, testing, and shipping. In the PC card assembly operation, a number of individuals are responsible for assembling electronic components into printed circuit boards. Each operator is responsible for soldering components according to a given set of instructions. Operators work on batches of 50 printed circuit boards. Each board requires 4 minutes of assembly time. After each batch is completed, the operator moves the assembled cards to the final assembly area. This move takes 11 minutes to complete.

The final assembly for each stereo unit requires 20 minutes and is also done in batches of 50 units. The batch of 50 stereos is moved into the test building, which is across the street. The move takes 20 minutes. Before conducting the test, the test equipment must be set up for the particular stereo model. The test setup requires 30 minutes. The units wait while the setup is performed. In the final test, the 50-unit batch is tested one at a time. Each test requires 10 minutes. The completed batch, after all testing, is sent to shipping for packaging and final shipment to customers. A complete batch of 50 units is sent from final assembly to shipping. The Shipping Department is located next to final assembly. Thus, there is no move time between these two operations. Packaging and labeling requires 10 minutes per unit.

1.  Determine the amount of value-added and non-value-added lead time and the value-added ratio in this process for an average stereo unit in a batch of 50 units. Categorize the non-value-added time into wait and move time. Round the percentage to one decimal place.

Value-added minutes  min
Non-value-added minutes:
Wait time  min
Move time  min
Total non-value-added time  min
Total lead time  min
Value-added ratio (as a percent)  %

2.  Move time in this process could best be reduced by:

  1. Doing nothing.
  2. Changing the layout from a process orientation to a product orientation.
  3. Increasing batch sizes.
  4. Eliminating the testing step.
  5. Hiring more workers.


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