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# Example of fractional factorial

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### Example of fractional factorial

1. 1. Example of Fractional Factorial Presented by: Juanito S. Chan, PIE
2. 2. Weed-Whacker Experiment • A weed whacker is a grass trimmer that runs on a mixture of gasoline and oil one-cylinder engine. • The weed whacker engine features a manual starter (pull cord), and its performance is largely a function of three controls: primer pump, choke, and gas.
3. 3. Weed-Whacker Experiment… • Before starting the engine, you must first give the primer several pumps, choke the air intake, and pull the starter cord several times. • To start the engine, the choke must be open.
4. 4. Factors for weed-whacker experiment Factor Name Low Level (−) High Level (+) A Prime pumps 3 5 B Pulls at full choke 3 5 C Gas during full choke pulls 0 100% D Final choke setting 0 50% E Gas for start 0 100%
5. 5. Std A B C D E Pulls 1 − − − − + 1 2 + − − − − 4 3 − + − − − 4 4 + + − − + 2 5 − − + − − 8 6 + − + − + 2 7 − + + − + 3 8 + + + − − 5 9 − − − + − 3 10 + − − + + 1 11 − + − + + 3 12 + + − + − 4 13 − − + + + 3 14 + − + + − 4 15 − + + + − 6 16 + + + + + 5
6. 6. Problem • Determine which factors are significant for minimizing pulls in weed whacker. • Give your recommendation.
7. 7. Final Recommendation The ideal procedure for minimizing pulls is: • Prepare engine with three primer pumps and three pulls at 100% choke with 0% gas. • Start at 0% choke at 100% gas.
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