Free training deck
Updated · About 45 minutes
MSA and Gage R&R training presentation
Measurement system analysis (MSA) is the set of studies that show how much of the variation in your data comes from the gauge and the people using it, instead of from the parts. Gage R&R is the best known of them. This free deck teaches it in about 45 minutes. Its 19 editable slides cover the five properties of a measurement system, repeatability against reproducibility, how to set up a study, the formulas for GRR, %GRR and the number of distinct categories, a worked example, how to read the result, attribute gauges, bias, linearity and stability, the common mistakes, a 15-minute mini study to run on the floor and four check questions with answers. Every slide has speaker notes.
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The title MSA and Gage R&R, can you trust the measurement, on a navy background with the LeanSuite logo.A look inside
What is in the 19 slides
For quality technicians, inspectors, operators who measure, process and quality engineers, supplier quality staff. Widescreen, in plain language, with speaker notes on every slide.
Slide 9: How to read %GRR and ndc 
Slide 10: Example: reading one study 
Slide 16: Try it: a mini measurement study
- 1MSA and Gage R&R: can you trust the measurement?Cover
- 2AgendaWhy measurement needs its own study · The five properties of a measurement system · How a gage R&R study works and how to read it · Attribute gauges and the other studies · Mistakes, activity and check questions
- 3What MSA is and why it comes firstEvery number you see is the part plus the measurement. MSA finds out how much is the measurement.
- 4Five properties of a measurement systemThree are about location (are readings centered on the truth) and two are about spread.
- 5Repeatability and reproducibilityGage R&R measures these two together. Add them up and you get the gage R&R (GRR).
- 6Before you run the studyCheck the gauge resolution. A common rule of thumb is that one reading step should be no more than one tenth of the tolerance or the process variation.
- 7A common study designThe AIAG manual describes several methods. This is the usual crossed study.
- 8The results and the formulasGRR = the square root of (repeatability squared + reproducibility squared).
- 9How to read %GRR and ndcThe commonly quoted guidelines from the AIAG MSA manual. Customers can set tighter ones.
- 10Example: reading one studyAn illustrative example: a bore gauge, 10 parts, 3 appraisers, 3 trials. Numbers are standard deviations in mm.
- 11What to do with the resultRepeatability bigger than reproducibility: look at the gauge, the fixture, the resolution and wear.
- 12Attribute gauges: go or no-goWhen the answer is pass or fail rather than a number, a variable gage R&R does not apply.
- 13Bias, linearity and stabilityGage R&R covers the spread. These studies cover location.
- 14When to run a studyFor any gauge named in a control plan, before the process is approved.
- 15Common mistakesTen parts from one batch, all nearly the same, so the gauge looks worse than it is.
- 16Try it: a mini measurement studyA 15-minute team activity
- 17Check your understanding4 check questions
- 18AnswersThe answers, to discuss
- 19Key points and next stepsNext: pick one gauge in your area that has never been studied and run the mini study.
The 45-minute session, slide by slide
- Slides, about: 30 minutes
- Activity (slide 16): 15 minutes
Present · 15 slides
- 1MSA and Gage R&R: can you trust the measurement?
- 2Agenda
- 3What MSA is and why it comes first
- 4Five properties of a measurement system
- 5Repeatability and reproducibility
- 6Before you run the study
- 7A common study design
- 8The results and the formulas
- 9How to read %GRR and ndc
- 10Example: reading one study
- 11What to do with the result
- 12Attribute gauges: go or no-go
- 13Bias, linearity and stability
- 14When to run a study
- 15Common mistakes
Do the activity · 1 slide
- 16Try it: a mini measurement study
Check and follow up · 3 slides
- 17Check your understanding
- 18Answers
- 19Key points and next steps
About 30 minutes of slides and 15 minutes of activity. Present: slides 1 to 15 (MSA and Gage R&R: can you trust the measurement?; Agenda; What MSA is and why it comes first; Five properties of a measurement system; Repeatability and reproducibility; Before you run the study; A common study design; The results and the formulas; How to read %GRR and ndc; Example: reading one study; What to do with the result; Attribute gauges: go or no-go; Bias, linearity and stability; When to run a study; Common mistakes). Do the activity: slide 16 (Try it: a mini measurement study). Check and follow up: slides 17 to 19 (Check your understanding; Answers; Key points and next steps).
How to run it
Running the session
- 1
Prepare
Read the speaker notes once and swap the illustrative example for one from your own area if you have it. Print the PDF if people like a handout.
- 2
Present
The slides take about 30 minutes. Every slide has notes, so you can talk from them rather than read the slide.
- 3
Do the activity
Pick one gauge in your area, such as a caliper, and 5 parts that differ in size. Number them on a hidden spot. The activity slide takes the team through it step by step; allow 15 minutes.
- 4
Check and follow up
Ask the check questions before showing the answers, then agree one next step with an owner and a date before people leave.
The check questions
- 1. What do repeatability and reproducibility each measure?
- Repeatability is the variation when one appraiser measures the same part with the same gauge several times. Reproducibility is the variation between different appraisers using the same gauge on the same parts.
- 2. Why must the parts in a study cover the range of the process?
- If all the parts are nearly alike, part variation is tiny, so the gauge variation looks large next to it and %GRR is overstated.
- 3. In the AIAG guidelines, which %GRR is generally acceptable, and which is not?
- Under 10% is generally acceptable and over 30% is not. In between depends on the application, the cost and the risk.
- 4. Is a gauge that is in calibration always good enough?
- No. Calibration checks the gauge against a standard. MSA checks how the whole measurement system performs in use, so a calibrated gauge can still fail a gage R&R.
Templates and guides to go with it
- Gage R&R study sheet10 parts, 2 or 3 appraisers, 2 or 3 trials: EV, AV, GRR, PV, %GRR and ndc by the average and range method.
- MSA study workbookBias, linearity and stability study sheets for a gauge, with the arithmetic done and a guide to which study when.
- Gauge calibration logA gauge register with next due dates and status, a calibration record with as-found and as-left readings, and the steps when a gauge fails.
- Topic: Quality managementEvery guide we have on the subject, sorted.
Read more
Terms in this deck
FAQ
MSA and Gage R&R training presentation: common questions
Measurement system analysis. It is the set of studies, such as bias, linearity, stability and gage R&R, that show how much of the variation in your data comes from the measurement system instead of the parts.
The AIAG guidelines call a %GRR under 10% generally acceptable, 10% to 30% possibly acceptable depending on the application, and over 30% not acceptable, with ndc of 5 or more. Customers can set their own limits, so check yours.
About 45 minutes: roughly 30 minutes of slides, a 15-minute mini measurement study and the check questions.
The AIAG Measurement Systems Analysis reference manual, fourth edition (2010), as publicly described. If your customer requires another edition or its own acceptance values, use theirs.
Yes. The PowerPoint file is fully editable, including the speaker notes. Many teams replace the illustrative bore gauge example with a gauge from their own plant.
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