Type 1 Gage R&R

Jay Arthur
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KnowWare International, Inc.
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Type 1 Gage R&R

Where a typical Gage R&R study uses 10 parts, 2-3 appraisers and 2-3 trials (3x3x10), a Type 1 Gage R&R study uses only one part, one appraiser, one gage and 50 trials (1x1x50).

Requirements:

• The part must have a known reference value (measured independently to a high degree of accuracy).
• A USL, LSL or tolerance.

Enter measurements, tolerance and reference value into Type 1 Gage R&R Worksheet:

The template will calculate the capability of the gage (Cg) and bias (Cgk). Greater than 1.33 is acceptable. If less than 1.33, measurement system needs improvement.

Conclusion
So, there, in a nutshell is Type 1 Gage R&R . Your goal is to minimize the amount of variation and error introduced by measurement, so that you can focus on part variation. This, of course, leads you back into the other root causes of variation: process, machines, and materials.

To learn more watch this Gage R&R Linearity Video

QI Macros Gage R&R Study Template with Range and Anova

QI Macros Attribute Gage R&R Study Template

AIAG Measurement System Analysis Gage R&R Overview

Gage R&R Destructive Testing

AIAG Case Study - Non-replicable

Gage R&R Software
Obviously, crunching all of the numbers for a Gage R&R study is non-trivial, but you can do it easily with the Gage R&R template for Excel. Buy one separately or as part of the QI Macros for Excel SPC Software.

Order Gage R&R Template Separately

Order Gage R&R Template as part of the QI Macros for Excel SPC Software

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To get formulas and a fuller understanding, order the MSA reference from the AIAG:
www.aiag.org

For a complete listing of AIAG books, go to:
aiag/publications

Keyboard Wedges & Gage Interfaces

WedgeLink keyboard wedges for transferring gage data directly into Excel