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KEY CHARACTERISTICS

KEY CHARACTERISTICS. ARE QUICKLY BECOMING A BEST COMMERCIAL PRACTICE A COMMUNICATIONS TOOL FOCUSES RESOURCES IN DESIGN & MFG –BY APPLYING DOE & SPC LEADS YOU TO KEY MFG CHARACTERICS NOT THE SAME AS A KPP Subject matter experts determine what features and processes are key.

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KEY CHARACTERISTICS

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  1. KEY CHARACTERISTICS • ARE QUICKLY BECOMING A BEST COMMERCIAL PRACTICE • A COMMUNICATIONS TOOL • FOCUSES RESOURCES IN DESIGN & MFG –BY APPLYING DOE & SPC • LEADS YOU TO KEY MFG CHARACTERICS • NOT THE SAME AS A KPP • Subject matter experts determine what features and processes are key NOTE: Additional information is provided on the notes pages. Either view or print the notes pages for this information, or run as a slide show to hear the presentation.

  2. KEY CHARACTERISTICS Different organizations have different definitions: • A PRODUCT FEATURE THAT HAS THE GREATEST AFFECT ON SAFETY, COST, RELIABILITY OR CUSTOMER SATISFACTION • FEATURES OR CHARACTERISTICS WHOSE VARIABILITY HAS THE GREATEST IMPACT ON FIT, PERFORMANCE, OR SERVICE LIFE OF A FINISHED PART Other than safety, key characteristics depend on a firm’s particular capabilities and experience.

  3. SAE AS9100 Section 3; Terms and Definitions • “Key characteristics: The features of a material, process or part whose variation has a significant influence on product fit, performance, service life or manufacturability.” Section 7.3.3 Design and development outputs • e) “shall identify key characteristics, when applicable, in accordance with design or contract requirements.” Section 8.2.4 Monitoring and measurement of product • “ When key characteristics have been identified, they shall be monitored and controlled.”

  4. WHY USE KEY CHARACTERISTICS? • PERFORMANCE AND QUALITY COME FROM REDUCING VARIABILITY OF KCs • WHERE DO I APPLY KCs? - On everything? - NO - Which features or functions are most important? - How do you identify the most vital features/functions? safety, reliability, mission essential, cost KCs are a communications tool and a resource allocation tool

  5. Key Flowdowns KPPs TPMs Product Key Characteristics Manufacturing Key Characteristics Assembly Key Characteristics

  6. KEY KEY KEY KEY KEY KEY Key Characteristic - Top Down Approach for a Digital Clock • CUSTOMER REQ’MTS • RELIABILITY • WEIGHT • PERFORMANCE • COST Courtesy Boeing Corp. • SYSTEM DESIGN • PERFORMANCE SUBSYSTEM DESIGN KEY CLOCK READABILITY ACCURACY KEY MANUFACTURING • PROCESS PARAMETERS • SOLDER JOINTS: • TEMP • TIME • SPEED • WAVE HEIGHT • SOLDER TYPE • HARDWARE REQ’MTS • VOLTAGE: • CAPACITANCE • CONFORMAL COATING • RESISTANCE POWER SUPPLY DISPLAY ASSEMBLY ILLUMINATION VOLTAGE KEY KEY PHOTO DIODE LCD PANEL LAMP CURRENT

  7. So Which Car Would You Rather Own? They look the same…. But, are they?

  8. Same TDP – Different Results • Ford Batavia Plant: • Ford Escorts were selling so well that Ford had to subcontract the production of transaxles. • Ford owned 60% of Mazda; they sent them the TDP and had them drop-ship the product to the Ford assembly plant. • Ford buyers began asking for the Escort with the Mazda transmission. When asked why, customers noted that the Mazda transmission had a reputation for reliability. • Ford was surprised and began an investigation. • Mazda (Korean) Plant: • Received the drawings and specifications and accomplished an analysis of the “Key Characteristics.” • There are over 10,000 dimensional and other characteristics on a typical transaxle. • Mazda found that only four (4) of these characteristics were “key or critical.” • Mazda used Statistical Process Control to manage those four characteristics.

  9. Summary • Key Characteristics provide a focus for product improvement • One measure of quality is conformance to nominal on all key characteristics • Reduce variation on key characteristics by using statistical process control • The number of key characteristics must be controlled or they lose their value

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