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Paper Cutting Exercise. Exercise objective: Perform and Analyze a variable MSA Study. 1. Cut a piece of paper into 12 different lengths that are all fairly close to one another but not too uniform. Label the back of the piece of paper to designate its “part number”

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Paper cutting exercise
Paper Cutting Exercise

  • Exercise objective: Perform and Analyze a variable MSA Study.

  • 1. Cut a piece of paper into 12 different lengths that are all fairly close to one another but not too uniform. Label the back of the piece of paper to designate its “part number”

  • 2. Perform a variable gage R&R study as outlined in this module. Use the following guidelines:

    • Number of parts: 12

    • Number of inspectors: 3

    • Number of trials: 5

  • 3. Create a MINITABTM data sheet and enter the data into the sheet as each inspector performs a measurement. If possible, assign one person to data collection.

  • 4. Analyze the results and discuss with your mentor.


Attribute msa

Attribute Gage Error

Repeatability

Reproducibility

Calibration

Attribute MSA

  • A methodology used to assess Attribute Measurement Systems.

    • They are used in situations where a continuous measure cannot be obtained.

    • It requires a minimum of 5x as many samples as a continuous study.

    • Disagreements should be used to clarify operational definitions for the categories.

      • Attribute data are usually the result of human judgment (which category does this item belong in).

      • When categorizing items (good/bad; type of call; reason for leaving) you need a high degree of agreement on which way an item should be categorized.


Attribute msa purpose
Attribute MSA Purpose

  • The purpose of an Attribute MSA is:

    • To determine if all inspectors use the same criteria to determine “pass” from “fail”.

    • To assess your inspection standards against your customer’s requirements.

    • To determine how well inspectors are conforming to themselves.

    • To identify how inspectors are conforming to a “known master,” which includes:

      • How often operators ship defective product.

      • How often operators dispose of acceptable product.

    • Discover areas where:

      • Training is required.

      • Procedures must be developed.

      • Standards are not available.

An Attribute MSA is similar in many ways to the continuous MSA, including the purposes. Do you have any visual inspections in your processes? In your experience how effective have they been?


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