Why/When is Taguchi Method Appropriate?

1
Why/When is Taguchi Method Appropriate?

• Tip 1
• Taguchis Signal-to-Noise Ratios are in Log form

Friday, 6 April 2001
2
Earlier Tip

• Taguchis Signal-to-Noise Ratios are in Log form

Friday, 6 April 2001
3
Taguchis Signal-to-Noise Ratios are in Log form
Friday, 6-April-2001

• 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)
• Taguchis SN-Ratio for smaller-the-better
• ? -10 Log10 ( 1/n ? Yi2 )
• Its range is infinity to infinity
• Extreme values are ? infinity ? defects 0
  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
• Taguchi Method
• 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
• Taguchi Method
• Useful at ALL Life-stages of a Process or
  Product
• Taguchi Method
• 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 ?
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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. Taguchis Signal-to-Noise Ratios are in Log
  form

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