Why/When is Taguchi Method Appropriate? A new tip Every Friday Friday, 29 th June 2001

Taguchi Method Useful at ALL Life-stages of a Process or Product (next 6 slides) Friday, 29 th June 2001 Tip #11

Taguchi Method Useful at ALL Life-stages of a Process or Product PRODUCT LIFE-STAGES are stage 1: Process Research & Development stage 2: Manufacture stage 3: Packaging stage 4: Storage stage 5: Transportation stage 6: Installation and Commissioning stage 7: Operation / use stage 8: Maintenance stage 9: Repair stage 10: Discard and Salvage

Taguchi Method Useful at ALL Life-stages of a Process or Product PRODUCT LIFE-STAGE #1 Process Research & Development NoIsE  Taguchi Method is primarily a R&D development method for experimentally improving quality and for making the product ROBUST against NoIsE  This is done by conducting a matrix experiment in which several control parameters are varied in balanced manner and NoIsE is intentionally included during experimentation.  The resulting quality characteristics is measured and analysed to give  BEST CONTROL PARAMETER SETTINGS  to make the process insensitive to the NoIsE  to make the process insensitive to the NoIsE

Taguchi Method Useful at ALL Life-stages of a Process or Product PRODUCT LIFE-STAGE #2 Manufacture  All the variations that are likely to be encountered during manufacturing are included during the planned experiments. These variations could be in,  Equipment (used in production – variations in its parameters)  Raw materials (from different suppliers)  Manpower (skilled / unskilled with same level of training)

Taguchi Method Useful at ALL Life-stages of a Process or Product PRODUCT LIFE-STAGE #7 Operation / use  All the variations (usually environmental) that are likely to be encountered during operation and use are included during the product testing. These variations could be in,  Power supply (variations in voltage, frequency etc.)  Ambient (temperature, humidity, dust, rf interference)  Improper use (unskilled user, inadequate training)

Taguchi Method Useful at ALL Life-stages of a Process or Product PRODUCT LIFE-STAGE #9 Repair long term use after  All the variations that are likely to be encountered during long term use due to wear and tear are included during the product testing - for example test a product after wear-and-tear, say 48 hours of continuous use at elevated temperature/humidity etc. NoIsE during the experiments  All the variations due to slow drifting of parameter values are included as NoIsE during the experiments itself (and products are made robust against the parameter that shows slow drift

More Tips Links below 16.Taguchi Method V a r i a n c e R e d u c t i o n Factor Effects 1 st Priority : V a r i a n c e R e d u c t i o n 2 nd Priority : Factor Effects “inner” “outer” 15. “inner” L9 array with “outer” L4 and L9 NoIsE arrays 14.Taguchi Method “inner” “outer” “inner” L18 array with “outer” L4 and L9 NoIsE arrays not 13.Taguchi Method Why/When is Taguchi Method not Appropriate? Friday, 3rd Aug 2001 Friday, 27 th July 2001 Friday, 20 th July 2001 Friday, 13 th July 2001 Tips 12, 11, 10 

More Tips Links below 12.Taguchi Method “inner” “outer” “inner” L8 array with “outer” L4 and L9 NoIsE arrays 11.Taguchi Method ALL Life-stages Useful at ALL Life-stages of a Process or Product 10.Taguchi Method “centering”“fine tuning” Performs Process “centering” or “fine tuning” Friday, 6 th July 2001 Friday, 29 th June 2001 Friday, 22 nd June 2001 Tips 9, 8, 7 

More Tips Links below NoIsE Tolerance Design 9.Taguchi Method Identifies the “right” NoIsE factor(s) for Tolerance Design 8.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, 15 th June 2001 Friday, 8 th June 2001 Friday, 1 st June 2001 Tips 6, 5, 4 

More Tips Links below 6.Taguchi Method Using Orthogonal Arrays for Generating Balanced Combinations of NoIsE Factors approaching IDEAL value 5.Taguchi Method Signal-to-Noise Ratio for Quality Characteristics approaching IDEAL value 4. Taguchi Method improves " quality “ at all the life stages the design stage itself at the design stage itself Friday, 25 th May 2001 Friday, 18 th May 2001 Friday, 11 th May 2001 Tips 3, 2, 1 

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

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