FAILSAFING AND MEASUREMENT CONTROL CHARTS . John R. Grout & Brian T. Downs Cox School of Business, Southern Methodist University. Outline. Shingo’s views on SPC Introduction to Failsafing Using self-checks instead of SPC Source inspection’s relationship with SPC
John R. Grout & Brian T. Downs
Cox School of Business, Southern Methodist University
Subject: Shingo's poke yoke system:
Shingo presents and expands on some rather interesting concepts, but he is also somewhat "blasphemous " when it comes to SQC. SQC may be statistically sound, but it is not always the best way to get to zero defects.
Comments pro and con would be appreciated.
Thank you, .....@someserver.com
...it became evident early in the project that achieving a Cp greater than 2 would go only part of the way. Mistake-proofing the design would also be required ... Mistake-proofing the design is an essential factor in achieving the [total number of defects per unit] goal.
Smith, B. IEEE Spectrum 30(9) 43-47
Judgment Inspection—Sorting out the defects
Informative inspection—provides information about the process that is used to control the process more effectively.
Source Inspection—Checks proper operating conditions and prevents a mistake from being made
1. Successive Checks
2. Self -Checks 4. Failsafing Devices
3. Source Inspection
-- ability to track the process variance.