E6S-057 - Rule out the Ruler Part 5A- Gauge R&R Variable MSA Types

Intro:  Welcome to the E6S-Methods podcast with Jacob and Aaron, your source for expert training, coaching, consulting, and leadership in Lean, Six Sigma, and continuous improvement methods. In this episode number 57, “Rule out the Ruler – Part 5A,” we give an overview of several types of the Gauge R&R, (Types 1 & 2, Crossed, Nested and more), and elaborate on the uses of each type.   Here we go.

***Rule out the Ruler - Measurement (Decision) System Variation***

Part 5A Types of Variable MSA, Gauge R&R

I            Type 1

a.       A type 1 gauge study assesses only the variation that comes from the gauge

i.      bias and repeatability (Cpg) on measurements from one operator and one reference part.

 ii.      focus only on the gauge, not on any other sources of variation.

1.      Some may require a type 1 gauge study first, before any other.

II         Type 2

a.       Crossed (Where we will focus for this episode)

i.      Each operator measures each part.

1.      same parts are measured by each operator multiple times. (perfectly balanced)

ii.      determine how much observed variation is due to the measurement system

b.      Nested gauge R&R study

i.      only one operator measures each part, usually because the test destroys the part

1.      Anything that cannot be replicate exact conditions

a.       Changes over time, the course of the study

i.      Measuring distance on the statapult/catapult shot

ii.      single shot on the statapult

b.      Act of measurement changes the part

i.      DNA blotting

ii.      Chemical titrations

iii.      Driving/travel time

ii.      called “nested” because one or more factors is nested under or confounded with another factor

1.      Cannot tell whether any difference is from the process or the measurement system.  Some assumptions and controls need to be put in place

c.       Expanded gauge R&R study

i.      A study in which one or more of the following conditions exists:

1.      More than two factors, usually, operator, gauge, and part

2.      Fixed or random factors

3.      Both crossed and nested factors

4.      An unbalanced design

d.      Bias & Linearity

i.      Basically a 2-level Type-1 Gauge study.  Known standards at multiple levels

1.      Measure bias and repeatability or variability across the range of the gauge

Outro: Thanks for listening to episode 56 of the E6S-Methods Podcast.  Stay tuned for episode number 58 for the a deeper dive into how to conduct a Type 2 Crossed Variable Gauge R&R in part 5B of our Rule Out the Ruler Series. If you would like to be a guest on podcast, contact us through our website. Follow us on twitter @e6sindustries and join a discussion on LinkedIn.  Subscribe to past and future episodes on iTunes or stream us live on-demand with Stitcher Radio. Find outlines and graphics for all shows and more at www.E6S-Methods.com. “Journey Through Success”