QM BenchQuality engineering tools

Quality

Measurement disputes: which quality tools to use

You and the customer or supplier measure different values on the same part.

Start with

MSA / Gage R&RFree tool

Gage R&R and bias on both sides.

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Hypothesis testsFree tool

Test whether the difference between labs is significant.

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Supporting methods

Control planFree tool

Agree on method, fixture and datum in the control plan.

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Attribute agreement analysisFree tool

For visual characteristics, agree limit samples.

Open the tool

First steps

  1. Exchange 10 parts and measure them on both sides.
  2. Compare bias and repeatability.
  3. Align method, clamping and temperature.

How to measure success

Bias between labs and %GRR. Record the value before you start, so the effect of every action can be shown.

When these methods are the wrong choice

  • MSA / Gage R&R: Nothing: do it before you trust any data.
  • Hypothesis tests: Exploring causes; use it to confirm them.
  • Control plan: Nothing in series production: every IATF process needs one.
  • Attribute agreement analysis: Measured characteristics.

The methods in one line

MethodWhat it is
MSA / Gage R&RChecks that the measurement system can see the variation you want to control.
Hypothesis testsProves whether a difference (before / after, machine A / B) is real or chance.
Control planLists every characteristic, how it is checked, how often and what the reaction plan is.
Attribute agreement analysisChecks visual and go / no-go inspectors against each other and a standard (kappa).

Other problems in Quality

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