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Why/When is Taguchi Method Appropriate?

Why/When is Taguchi Method Appropriate?. Tip #2 Taguchi Method Can Study Interaction between NoIsE Factors and Control Factors. Friday, 27 April 2001. Tip #2. Taguchi Method Does not STUDY : Interaction between Control Factors.

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Why/When is Taguchi Method Appropriate?

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  1. Why/When is Taguchi Method Appropriate? Tip #2 Taguchi Method Can Study Interaction between NoIsE Factors and Control Factors Friday, 27 April 2001

  2. Tip #2 Taguchi Method Does not STUDY : Interaction between Control Factors • Use of Orthogonal Array implies that we can not or ought not study interactions between control factors. We include only control factors that do not interact with each other, say A, B, C and D. This is shown in next slide (use L9 array) Friday, 27 April 2001

  3. Expt. No. Control Factor A Control Factor B Control Factor C Control Factor D 1 1 1 1 1 2 1 2 2 2 3 1 3 3 3 4 2 1 2 3 5 2 2 3 1 6 2 3 1 2 7 3 1 3 2 8 3 2 1 3 9 3 3 2 1 Taguchi Method Does not STUDY : Interaction between Control Factors Friday, 27 April 2001

  4. Taguchi Method can studyInteraction between Control Factor ‘R’ and (A, B, C or D)with repeated use of OA • If there is a single control factor ‘R’ that may have strong interactions with several control factors, then we can simply repeat the entire OA experiments at twodifferent levels of ‘R’ This is shown in next slide (use two sets of L9 array) • Obviously, ALL interactions, between ‘R’ and any one of A, B, C and D, can be studied) Friday, 27 April 2001

  5. SPINDLE SPEED Expt. No. Control Factor A Control Factor B Control Factor C Control Factor D 600 rpm 900 rpm 1 10 1 1 1 1 1 1 1 1 900 rpm 600 rpm 2 11 1 1 2 2 2 2 2 2 600 rpm 900 rpm 3 12 1 1 3 3 3 3 3 3 900 rpm 600 rpm 13 4 2 2 1 1 2 2 3 3 900 rpm 600 rpm 5 14 2 2 2 2 3 3 1 1 900 rpm 600 rpm 6 15 2 2 3 3 1 1 2 2 600 rpm 900 rpm 7 16 3 3 1 1 3 3 2 2 900 rpm 600 rpm 17 8 3 3 2 2 1 1 3 3 900 rpm 600 rpm 18 9 3 3 3 3 2 2 1 1 Taguchi Method can studyInteraction between Control Factor ‘R’ and (A, B, C or D)with repeated use of OA Friday, 27 April 2001

  6. Taguchi Method can studyInteraction between a Noise Factor ‘X’ and (A, B, C or D)with repeated use of OA • If there is a single noise factor ‘X’ that may have strong correlation with several control factors, then we can simply repeat the entire OA experiments at twodifferent levels of ‘X’ This is shown in next slide (use two sets of L9 array) • Obviously, ALL correlations between ‘X’ and any one of A, B, C and D can be studied Friday, 27 April 2001

  7. Material Hardness Expt. No. Control Factor A Control Factor B Control Factor C Control Factor D soft HARD 1 10 1 1 1 1 1 1 1 1 HARD soft 2 11 1 1 2 2 2 2 2 2 soft HARD 3 12 1 1 3 3 3 3 3 3 HARD soft 13 4 2 2 1 1 2 2 3 3 HARD soft 5 14 2 2 2 2 3 3 1 1 HARD soft 6 15 2 2 3 3 1 1 2 2 soft HARD 7 16 3 3 1 1 3 3 2 2 HARD soft 17 8 3 3 2 2 1 1 3 3 HARD soft 18 9 3 3 3 3 2 2 1 1 Taguchi Method can studyInteraction between a Noise Factor ‘X’ and (A, B, C or D)with repeated use of OA Friday, 27 April 2001

  8. Taguchi Method can studyInteraction between a Noise Factor ‘X’ and (A, B, C or D)with repeated use of OA • The OA based experiments, say L9 as in this example, require that two samples are made for each row (each row indicates one combination of control factors A, B, C and D) • The measured values of quality characteristics are noted for that row • Analysis then gives ‘best’ settings for control factors A, B, C and D that would give least sensitivity to the noise factor, say hardness as in this example Friday, 27 April 2001

  9. Expt. No. Control Factor A Control Factor B Control Factor C Control Factor D Level 1 Level 2 NOISE FACTOR Material Hardness 1 /10 1 1 1 1 Soft HARD 2 /11 1 2 2 2 Soft HARD 3 /12 1 3 3 3 Soft HARD 4 /13 2 1 2 3 Soft HARD 5 /14 2 2 3 1 Soft HARD 6 /15 2 3 1 2 Soft HARD 7 /16 3 1 3 2 Soft HARD 8 /17 3 2 1 3 Soft HARD 9 /18 3 3 2 1 Soft HARD This IS equivalent to the repeated use of OA shown earlier Friday, 27 April 2001

  10. Taguchi Method 1st Priority : Variance Reduction2nd Priority : Factor Effects 15.“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 TaguchiMethod not Appropriate? Friday, 3rd Aug 2001 Friday, 27th July 2001 Friday, 20th July 2001 Friday, 13th July 2001 More Tips Links below Tips 12, 11, 10 

  11. 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” Friday, 6th July 2001 Friday, 29th June 2001 Friday, 22nd June 2001 More Tips Links below Tips 9, 8, 7 

  12. Taguchi Method Identifies the “right”NoIsEfactor(s) for Tolerance Design Taguchi Method Finds best settings to optimizeTWO 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 More Tips Links below Tips 6, 5, 4 

  13. Taguchi MethodUsing Orthogonal Arrays for Generating Balanced Combinations of NoIsE Factors Taguchi MethodSignal-to-Noise Ratio for Quality Characteristicsapproaching IDEAL value 4. Taguchi Methodimproves " quality “ at all the life stages atthe design stage itself Friday, 25th May 2001 Friday, 18th May 2001 Friday, 11th May 2001 More Tips Links below Tips 3, 2, 1 

  14. 3. Taguchi MethodAppropriate forConcurrent Engineering 2. Taguchi Methodcan studyInteraction between Noise Factors and Control Factors 1. Taguchi’sSignal-to-Noise Ratiosare inLog form Friday, 4th May 2001 Friday, 27th April 2001 Friday, 6th April 2001 More Tips Links below

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