Skip to content

Free template

Updated

Gage R&R study sheet

A gage R&R study measures how much of the variation you see comes from the measurement system itself. Repeatability, or equipment variation (EV), is the spread when one appraiser measures the same part several times; reproducibility, or appraiser variation (AV), is the difference between appraisers. Together they make GRR, which is compared with the part-to-part variation (PV) and the total variation (TV). This template uses the average and range method of the AIAG Measurement Systems Analysis (MSA) manual with 10 parts, 2 or 3 appraisers and 2 or 3 trials. Page 1 of the PDF is the data sheet, with the averages and ranges for each appraiser and the part averages. Page 2 has every calculation step with the K1, K2, K3 and D4 constants, a column with the worked example, the %GRR guidance and the number of distinct categories (ndc). The Excel version works out the averages and ranges, the average range, the range limit with any range above it flagged, the difference between appraisers, the range of the part averages, EV, AV, GRR, PV and TV, each as a % of total variation, ndc, an optional % of tolerance and the %GRR band, with an Example sheet that matches the worked example on this page.

Free to use: print it, copy it and edit it for your team. Enter your name and work email once to download.

Page 1 of the gage R&R study sheetFields for part, characteristic, specification, tolerance and gauge, and a table of 10 parts with three trials, the average and the range for appraisers A, B and C, and a part average row.
10 parts × 3 appraisers × 3 trialsAverages and rangesRange limit checkEV, AV, GRR, PV and TV%GRR and ndc% of toleranceWorked example
Filled-in Gage R&R study sheet: flange thickness, 10 parts, 3 appraisers
The same sheet filled in with the worked example (page 2 of the PDF, illustrative numbers). Open full size (opens the picture in a new tab)

When to use it

When to run a gage R&R study

  • Before a capability study or a control chart, so the data shows the process and not the gauge.
  • For a new gauge, a gauge moved to a new process, or after a repair that could change how it reads.
  • When a customer asks for measurement system analysis in a PPAP, or the control plan names the gauge for a special characteristic.
  • When operators disagree about whether parts are good, or parts pass at one station and fail at the next.

How to fill it in

  1. 1

    Choose 10 parts

    Parts from normal production that cover the spread of the process, not all from the middle. Number them where the appraisers cannot see.

  2. 2

    Choose the appraisers

    Two or three people who use the gauge on the job, with the same gauge and the usual method.

  3. 3

    Measure blind, in random order

    Each appraiser measures all 10 parts, then again in a new order for each trial, without seeing the earlier readings.

  4. 4

    Check the ranges

    Work out each part's range for each appraiser and the average range. A range above D4 × the average range points to a misread or a damaged part: find out why and re-measure.

  5. 5

    Work out the results

    EV from the average range, AV from the difference between appraiser averages, GRR, PV from the range of part averages, then each as a % of total variation, and ndc.

  6. 6

    Decide

    Under 10% GRR is generally acceptable, 10% to 30% may be acceptable depending on the application, and over 30% means the measurement system needs fixing. Check ndc too: 5 or more is the usual requirement.

Constants

Average and range method constants

K1 depends on the number of trials, K2 on the number of appraisers, and K3 on the number of parts: 0.3146 for the 10 parts in this template. D4 sets the upper limit for the ranges.

  • K1, by trials

    With 2
    0.8862
    With 3
    0.5908
  • K2, by appraisers

    With 2
    0.7071
    With 3
    0.5231
  • D4, by trials

    With 2
    3.267
    With 3
    2.574

A filled-in example

Illustrative, not a benchmark

An example: flange thickness, 5.00 ± 0.15 mm, 10 parts, 3 appraisers, 3 trials each (illustrative readings). The Excel version's Example sheet has all 90 readings and gives the same results.

The example study as a share of total variation

  1. EV, repeatability (the gauge)10.0%
  2. AV, reproducibility (the appraisers)12.0%
  3. GRR, measurement system15.6%
  4. PV, part-to-part98.8%

Equipment variation 10.0 percent, appraiser variation 12.0, gauge R and R 15.6, part variation 98.8 percent of total variation. GRR is in the 10 to 30 percent band.

These are ratios of standard deviations, so they do not add up to 100%. GRR at 15.6% is in the 10% to 30% band: usable if the customer agrees. AV above EV points at how people measure.
  • Average ranges of 0.0058, 0.0074 and 0.0064 mm give an overall average range of 0.00653 mm. The range limit is 2.574 × 0.00653 = 0.0168 mm, and no range is above it.
  • EV = 0.00653 × 0.5908 = 0.00386 mm. Appraiser averages are 4.96233, 4.96773 and 4.95870 mm, a difference of 0.00903 mm, so AV = √((0.00903 × 0.5231)² − 0.00386² ÷ 30) = 0.00467 mm.
  • GRR = √(0.00386² + 0.00467²) = 0.00606 mm. Part averages run from 4.90767 to 5.02944 mm, a range of 0.1218, so PV = 0.1218 × 0.3146 = 0.0383 mm and TV = 0.0388 mm.
  • Of total variation: EV 10.0%, AV 12.0%, GRR 15.6%, PV 98.8%. ndc = 1.41 × 0.0383 ÷ 0.00606 = 8.9, rounded down to 8. GRR is 12.1% of the 0.30 mm tolerance.

15.6% sits in the 10% to 30% band: usable for this characteristic if the customer agrees. AV is larger than EV, which points at how the appraisers measure rather than at the gauge, and appraiser B reads highest on average, so the next step was to agree one way of holding the micrometer and train all three.

Common mistakes

  • Parts from a narrow band

    If the 10 parts are nearly the same, PV is small and %GRR of total variation looks poor even with a good gauge. Pick parts across the process spread.

  • Appraisers who know which part is which

    They remember earlier readings. Hide the numbers and change the order every trial.

  • Ignoring a range above the limit

    One misread inflates EV. Find the cause and re-measure before quoting the result.

  • Quoting %GRR without saying of what

    % of total variation and % of tolerance give different numbers. Say which you report and why.

Download the template

Free to use: print it, copy it and edit it for your team. Enter your name and work email once to download.

Run this template in LeanSuite

In LeanSuite quality checks run as digital checklists with number limits, an out-of-spec answer can raise a tag or start a CAPA automatically, and KPI Builder tracks quality KPIs against targets.

See it in a 45-minute demo

FAQ

Gage R&R study sheet: common questions

  1. By the AIAG MSA guidance, under 10% GRR is generally acceptable, 10% to 30% may be acceptable depending on how important the characteristic is, the cost of a better gauge and the risk, and over 30% is not acceptable. The number of distinct categories should usually be 5 or more. Your customer may set its own limits.

  2. Repeatability (EV) is the variation when the same appraiser measures the same part with the same gauge several times. Reproducibility (AV) is the variation between the averages of different appraisers. High EV points at the gauge or the fixture; high AV points at method or training.

  3. The usual average and range study is 10 parts, 3 appraisers and 2 or 3 trials, 60 or 90 readings. This template takes 10 parts with 2 or 3 appraisers and 2 or 3 trials. Fewer parts or trials make the estimates less reliable.

  4. With total variation when the gauge is used to control or improve the process, because it shows whether the gauge can see the process moving. With the tolerance, 100 × GRR ÷ (tolerance ÷ 6), when the gauge is used to sort good parts from bad. Report which one you used.

  5. The number of distinct categories: how many groups of parts the measurement system can tell apart across the process spread. It is 1.41 × PV ÷ GRR, rounded down. Below 5, the gauge cannot separate the parts well enough to control the process.

More free templates

All templates
Browse all 199 templates

Can't find the template you need?

Tell us what you're looking for. We'll make it and send it to your inbox, free.

A shift handover sheet, a red tag log, a changeover checklist for one machine: if your team uses it on the floor, ask.

By sending this form you agree to our Terms of Service and Privacy Policy.

Pass it on

We want LeanSuite to be the best place on the internet for lean help. If this was useful, send it to someone on your team or in your network who needs it.