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Mistake Proofing and Poka Yoke

Mistake Proofing and Poka Yoke. Quality Series. Disclaimer and Approved Use. Disclaimer This presentation is intended for use in training individuals within an organization. The handouts, tools, and presentations may be customized for each application.

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Mistake Proofing and Poka Yoke

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  1. Mistake Proofing and Poka Yoke Quality Series

  2. Disclaimer and Approved Use • Disclaimer • This presentation is intended for use in training individuals within an organization. The handouts, tools, and presentations may be customized for each application. • THE FILES AND PRESENTATIONS ARE DISTRIBUTED ON AN "AS IS" BASIS WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESSED OR IMPLIED. • Copyright • This presentation is created and copyrighted by LeanPresentations.com, owned and operated by Kanso Strategies LLC. • Approved Use • Each copy of this presentation can be used throughout a single Customer location, such as a manufacturing plant, or by a single Consultant or trainer when at multiple clients. Contact us for authorization to use this presentation at multiple locations. • The presentation may be customized to satisfy the customer’s application. • The presentation may not be re-sold or re-distributed without express written permission. • Current contact information can be found at: www.leanpresentations.com

  3. Outline • What is Mistake Proofing? • Everyday Examples • Effectiveness & ROI • Error Proofing and SPC • Inspection Techniques • Types of Poka Yokes

  4. Everyday Examples 3.5 inch diskettes cannot be inserted unless diskette is oriented correctly. This is as far as a disk can be inserted upside-down. The beveled corner of the diskette along with the fact that the diskette is not square, prohibit incorrect orientation. Fueling area of car has three error-proofing devices: 1. insert keeps leaded-fuel nozzle from being inserted 2. tether does not allow loss of gas cap 3. gas cap has ratchet to signal proper tightness and prevent overtightening. New lawn mowers are required to have a safety bar on the handle that must be pulled back in order to start the engine. If you let go of the safety bar, the mower blade stops in 3 seconds or less.

  5. Poka yoke & SPC

  6. Individually, mistakes are rare • Task Type Probability • Detection of deviation or inspection 0.07 • Alpha input per character 0.008 • Numeric input per character 0.003 • Assembly per task element 0.00007 • As a group they are common • Research study #1 (Harris) >0.80 • Research study #2 (Rook) 0.82 • Research study #3 (Voegtlen) 0.60 • Research study #4 (Headlamps) >0.70 • NASA mishaps >0.50 • FAA Maintenance problems >0.94 Data from “Human Reliability Data - The State of the Art and the Possibilities” Jeremy C. Williams, 1989 CEGB

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