Question

Sound Tek Inc. manufactures electronic stereo equipment. The manufacturing process includes printed circuit (PC) board assembly, final assembly, testing, and shipping. In the PC board 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 board assembly time. After each batch is completed, the operator moves the assembled boards to the final assembly area. This move takes 12 minutes to complete. The final assembly for each stereo unit requires 20 minutes and is also done in batches of 50 units. A 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 9 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 testing to shipping. The Shipping Department is located next to testing. Thus, there is no move time between these two operations. Packaging and labeling requires 12 minutes per unit.

Required:
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 45 units.

Answer 1

A. 45

B.2,235

C. 1.9%

Step-by-step explanation:

A. Calculation to determine the amount of value-added

VALUE ADDED TIME

PC board Assembly 4

Final Assembly 20

Testing 9

Packaging and labeling 12

Total Value added time 45

Therefore the amount of value-added is 45

B. Calculation to determine non-value-added lead time

NON-VALUE-ADDED LEAD TIME

Wait time for non added value 2,205

[45*(50-1)]

Add Test set up time 30

Wait time 2,235

Therefore The non-value-added lead time is 2,235

C. Calculation to determine the value-added ratio

Value added time 45

Non value added lead time:

Wait time lead time 2,235

Move time lead time 32

(12+20)

Total lead time 2,312

Value added ratio 1.9%

(45/2312*100)

Therefore the value-added ratio is 1.9%