We are trying to determine the R&R of the operators and of the CMM, so we are using the step gage, because we know there will be no variation in that object.

Look at the % contribution of GRR against the Part to part, if GRR is considerably lower than Part 2 Part, accept the measurement system else reject and reconsider. Ive been asked to do a Gage R&R project using the CMM as the gage, and a step gage as the control subject.

If the % tolerance is less than 10% accept the measurement system else reconsider the measurement system

Look at the Number of distinct categories shown, if it is greater than or equal to 4 вЂ“ Accept the Measurement System else it may be considered inadequate.

The session window shall show the following result This chart shows how the same part has been measured by the different operators. In case of good measurement system the charts for the different operators will look identical. This chart shows how the different parts have been measured by the different operators.

In case of a good MSA the variation in the measured values will be less. (In a good measurement system, the values will lie close to the central line. Range (max-min) for each part for each operator is plotted in the sample range chart. (Information provided in the session window is presented in a form of chart)ДЄverage of the reading of the each part for the each operator is plotted in the sample mean chart. GRR is further divided in to repeatability & reproducibility. In Measurement data, enter the column of measurements, and then click OK.Д¬omponent of variation: this chart shows the breakup of variation into GRR and Part to part variation. In Operators, enter the column of operator names or numbers. In Part numbers, enter the column of part names or numbers. If the Gage R&R study is successful the data can be used for further analysis This is being done to ensure that the data is Accurate, Repeatable and Reproducible. To do a Gage R&R Study (Crossed) in Minitab-Д¬hoose Stat - Quality Tools - Gage R&R Study Crossed) The Gage R&R studies require balanced designs (equal numbers of observations per cell) and repl icates.

Parts and operators can be text or numbers. Structure your data so that each row contains the part name or number, operator and the observed measurement. Gage R&R Study (Crossed) is the most common method of Gage R&R in the industry

Minitab type 1 gage study