1. Why/When is Taguchi Method Appropriate?
A new tip Every Friday
Friday, 27th July 2001

2. New Tip #15
Taguchi Method “inner” L9 array with “outer” L4 and L9 NoIsE arrays (next 6 slides)
Friday, 27th July 2001

3. “inner” L9 array with “outer” L4 and L9 NoIsE arrays
all 4 columns assigned
to 3-Level Factors (3 slides)
Dummy Levels can be used (2 slides)
Can not study interactions between
any two columns
 Best suited for a simple process
consisting of 4-control factors

4. L9 expt. with 2 Noise Factors (2-levels each)
(7) Taguchi Method for Q&R : L9 expt. with 2 noise factors
L9 expt. with 2 Noise Factors (2-levels each)
Control Factors
Measurements to Capture Noise
Expt.No. A B C D
E1F1
E1F2
E2F1
E2F2
E1F1
E1F2
E2F1
E2F2 1 2 3 4 5 6 7 8 9 1 2 3 1 2 3 1 2 3 1 2 3
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E and F are noise factors with 2 level each
‘all’ 4 combinations are E1F1 , E1F2 , E2F1 and E2F2

5. Measurements to Capture Noise
(7) Taguchi Method for Q&R : L9 expt. with 2 noise factors
Measurements to Capture Noise
L9 expt. With Noise Array
L4 Array # 1 2 3 4 G 1 2
Control Factors F 1 2 E 1 2
Expt.No. A B C D
E1F1G1
E1F2G2
E2F1G2
E2F2G1
E1F1G1
E1F2G2
E2F1G2
E2F2G1 1 2 3 4 5 6 7 8 9 1 2 3 1 2 3 1 2 3 1 2 3
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E, F and G are noise factors with 2 level each, 4 combinations as per L4 Array are E1F1G1 , E1F2G2, E2F1G2 and E2F2G1

6. L9 expt. With Noise Array Control Factors L9 Array
(7) Taguchi Method for Q&R : L9 expt. with 2 noise factors
L9 expt. With Noise Array E F G H 1 2 3
L9 Array
Control Factors
Measurements to Capture NoIsE
Expt.No. A B C D #1 #2 #3 #4 #5 #6 #7 #8 #9 #1 #2 #3 #4 #5 #6 #7 #8 #9 1 2 3 4 5 6 7 8 9 1 2 3 1 2 3 1 2 3 1 2 3
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E, F, G and H are noise factors with 3 level each,
9 combinations as per L9 Array are used for measurements #1 to #9

7. L9 expt. with Dummy Levels
(7) Taguchi Method for Q&R : L9 expt. with 2 noise factors
L9 expt. with Dummy Levels
Control Factors
Expt.No. A B C D 1 2 3 4 5 6 7 8 9 1 2 3 1 2 2’ 1 2 3 1 2 3
Control Factor B has its 3rd level same as the 2nd Level. This is called a dummy level.
It allows us to use a 2-level factor in L9 array based experiment

8. L9 expt. with Dummy Levels and 2 Noise Factors (2-levels each)
(7) Taguchi Method for Q&R : L9 expt. with 2 noise factors
L9 expt. with Dummy Levels and 2 Noise Factors (2-levels each)
Control Factors
Measurements to Capture Noise
Expt.No. A B C D
E1F1
E1F2
E2F1
E2F2
E1F1
E1F2
E2F1
E2F2 1 2 3 4 5 6 7 8 9 1 2 3 1 2 2’ 1 2 3 1 2 3
Y11
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Y13
Y14
Y21
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Y23
Y24
Y31
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Y33
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Y41
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Control Factor B has its 3rd level same as the 2nd Level. This is called a dummy level
E and F are noise factors with 2 level each
‘all’ 4 combinations are E1F1 , E1F2 , E2F1 and E2F2

9. More Tips Links below Tips 12, 11, 10  Taguchi Method
Friday, 3rd Aug 2001
Friday, 27th July 2001
Friday, 20th July 2001
Friday, 13th July 2001
Taguchi Method
1st Priority : Variance Reduction 2nd Priority : Factor Effects
15. “inner” L9 array with “outer” L4 and L9 NoIsE arrays
“inner” L18 array with “outer” L4 and L9 NoIsE arrays
Taguchi Method Why/When is Taguchi Method not Appropriate?
Tips 12, 11, 10 

10. More Tips Links below Taguchi Method
Friday, 6th July 2001
Friday, 29th June 2001
Friday, 22nd June 2001
Taguchi Method
“inner” L8 array with “outer” L4 and L9 NoIsE arrays
Useful at ALL Life-stages of a Process or Product
Performs Process “centering” or “fine tuning”
Tips 9, 8, 7 

11. More Tips Links below Tips 6, 5, 4 
Taguchi Method Identifies the “right” NoIsE factor(s) for Tolerance Design
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, 15th June 2001
Friday, 8th June 2001
Friday, 1st June 2001
Tips 6, 5, 4 

12. More Tips Links below Tips 3, 2, 1 
Friday, 25th May 2001
Friday, 18th May 2001
Friday, 11th May 2001
Taguchi Method Using Orthogonal Arrays for Generating Balanced Combinations of NoIsE Factors
Taguchi Method Signal-to-Noise Ratio for Quality Characteristics approaching IDEAL value
4. Taguchi Method improves " quality “ at all the life stages
at the design stage itself
Tips 3, 2, 1 

13. More Tips Links below
Friday, 4th May 2001
Friday, 27th April 2001
Friday, 6th April 2001
3. Taguchi Method Appropriate for Concurrent Engineering
2. Taguchi Method can study Interaction
between Noise Factors and Control Factors
1. Taguchi’s Signal-to-Noise Ratios are in Log form

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