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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
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.

key characteristics1
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.

sae as9100
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.”
why use key characteristics
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

key flowdowns
Key Flowdowns

KPPs

TPMs

Product Key Characteristics

Manufacturing Key Characteristics

Assembly Key Characteristics

key characteristic top down approach for a digital clock

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

so which car would you rather own
So Which Car Would You Rather Own?

They look the same….

But, are they?

same tdp different results
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.
summary
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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