Why/When is Taguchi Method Appropriate? Friday, 1 st June 2001 Tip #7 Taguchi Method : When to Select a ‘larger’ OA to perform “Factorial Experiments”

Why/When is Taguchi Method Appropriate?

Friday, 1Friday, 1stst June 2001 June 2001

Tip #7Tip #7Taguchi Method :

When to Select a ‘larger’ OA to perform “Factorial Experiments”

Taguchi Method :When to Select a ‘larger’ OA

to perform “Factorial Experiments”

• We always ‘think’ about ‘reducing’ the number of experiments (to minimize the ‘resources’ – equipment, materials, manpower and time)

• However, doing ALL / Factorial experiments is a good idea if– Conducting experiments is ‘cheap/quick’‘cheap/quick’ but

measurements are ‘expensive/take too long’‘expensive/take too long’– The experimental facility will NOTNOT be available later

to conduct the ‘verification’ experiment

– We do NOTNOT wish to conduct separateseparate experiments for studying interactions between Control Factors

Tip #7Tip #7

Taguchi Method :When to perform ALL / “Factorial Experiments”

• Conducting ALL / Factorial experiments is a good idea if– Conducting experiments is ‘cheap’‘cheap’ (and in-house)

but measurements are ‘expensive’ ‘expensive’ (to be done elsewhere)

• When an apparatus is fully set-up, it may be rather easy to conduct the experiments quickly (if we are not hampered by measurements in between the experiments)

• Just collect all samples (that have ‘captured’ the effects of NoIsE factors)

• Send samples (elsewhere) for measurements (make sure that these will capture the effects of NoIsE)

• Conducting ALL / Factorial experiments is a good idea if– The experimental facility will NOTNOT be

available LATERLATER to conduct the ‘verification’ experiment

• A typical case when experiments are done • On Production equipment

• On Borrowed equipment

• In presence of visiting ‘experts’


• Conducting ALL / Factorial experiments is a good idea if– We do NOTNOT wish to conduct separateseparate experiments

for studying interactionsinteractions between Control Factors– Analyze without considering interactions, Predict best

combinations of control factors as well as Best results. Check this out – we already HAVE the results of the best experiment

– If the results do not match, Evaluate the “key” interactions – again check results

– If the results ‘still’ do not match, Evaluate “all” interactions – again check results


Taguchi Method :How to Select a ‘larger’ OA


Control Factors and Levels

Factorial Combinations

Suitable

OA

2 CF / 2-levels 4 L4




Taguchi Method :How to Select a ‘larger’ OA


Control Factors and Levels

Factorial Combinations

Suitable

OA


1 CF / 2-levels

2 CF / 3-levels18 L18


1 CF / 2-levels

3 CF / 3-levels54 L54

More Tips More Tips Links belowLinks below

16. Taguchi Method

1st Priority : VVaarriiaanncce e RReedduuccttiioonn

2nd Priority : Factor EffectsFactor Effects

15. “inner”“inner” L9 array with “outer”“outer” L4 and L9 NoIsE arrays

14. Taguchi Method

““inner”inner” L18 array with “outer”“outer” L4 and L9 NoIsE arrays

13. Taguchi Method

Why/When is Taguchi Method not not Appropriate?

Friday, 3rd Aug 2001

Friday, 27th July 2001



Tips 12, 11, 10 Tips 12, 11, 10


12. Taguchi Method

““inner”inner” L8 array with

“outer”“outer” L4 and L9 NoIsE arrays

11. Taguchi Method

Useful at ALL Life-stagesALL Life-stages of a Process or Product

10. Taguchi MethodPerforms Process “centering”“centering” or “fine tuning”“fine tuning”


Friday, 29th June 2001

Friday, 22nd June 2001

Tips 9, 8, 7 Tips 9, 8, 7


9. Taguchi Method

Identifies the “right” NNooIIssEE factor(s)

for Tolerance DesignTolerance Design

10. Taguchi Method

Finds best settings to optimize TWO quality characteristics Simultaneously

7. Taguchi Method

When to select a ‘Larger’ OA to perform “Factorial Experiments”



Friday, 1st June 2001

Tips 6, 5, 4 Tips 6, 5, 4


6. Taguchi Method Using Orthogonal Arrays for Generating Balanced Combinations of NoIsE Factors

5. Taguchi Method Signal-to-Noise Ratio for Quality Characteristics

approaching IDEAL valueapproaching IDEAL value

4. Taguchi Method improves " quality “ at all the life stages

at the design stage itselfthe design stage itself

Friday, 25th May 2001



Tips 3, 2, 1 Tips 3, 2, 1


3. Taguchi Method Appropriate for Concurrent EngineeringConcurrent Engineering

2. Taguchi Method can study Interaction

between Noise Factors Noise Factors and Control Control FactorsFactors

1. Taguchi’s Signal-to-Noise RatiosSignal-to-Noise Ratios are in

Log formLog form


Friday, 27th April 2001

Friday, 6th April 2001

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Why/When is Taguchi Method Appropriate? Friday, 1 st June 2001 Tip #7 Taguchi Method : When to Select a ‘larger’ OA to perform “Factorial Experiments”