1. Why/When is Taguchi Method Appropriate?
Tip #1
Taguchi’s Signal-to-Noise Ratios are in Log form
Friday, 6 April 2001

2. Taguchi’s Signal-to-Noise Ratios are in Log form
Earlier Tip
Taguchi’s Signal-to-Noise Ratios are in Log form
Friday, 6 April 2001

3. Taguchi’s Signal-to-Noise Ratios are in Log form
Friday, 6-April-2001
Taguchi’s Signal-to-Noise Ratios are in Log form
Let us say we are trying reduce ‘defects’ in a process using L9 array
The prediction will be, say,
7 defects +- a few defects
The prediction error may be high due to errors in individual 9 experiments. Say it is +- 9
7 defects +-9  -2 to 17 defects ???????(-2 is problem)
Taguchi’s SN-Ratio for smaller-the-better
 = -10 Log10 ( 1/n  Yi2 )
Its range is – infinity to +infinity
Extreme values are = +infinity  defects = [average Y2 = 10(-/10) ]
= - infinity  defects = infinity
Always predicts defects between allowed range of 0 to infinity

4. Earlier Tips Links below
Friday, 27th July 2001
Friday, 20th July 2001
Friday, 13th July 2001
Taguchi Method
“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 

5. Earlier Tips Links below
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 

6. Earlier Tips Links below
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 

7. Earlier Tips Links below
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 

8. Earlier 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

9. end