GAGE REPEATABILITY AND REPRODUCIBILITY (GR&R)

INTRODUCTION FOR GAGE REPEATABILITY AND REPRODUCIBILITY (GR&R)

GR&R is necessary to ensure that Measurement Systems have the necessary capability to detect changes in your product or process performance. It is essential to have a reference to standards so that product and process specifications are consistent. Consequently, GR&R is required by ISO or IATF Standards (e.g. IATF 16949). This training will be conducted as per AIAG MSA Manual 4^th Edition

COURSE OBJECTIVES

• Conduct measurement system studies including assessment of linearity, stability, repeatability, and reproducibility.
• Differentiate components of variation in a measurement system.
• Understand how to make improvement after GR&R studies.
• Develop the ability to compare gauge variation to tolerances.
• Establish gauge correlation and corrective factors.

INTENDED AUDIENCES

1. Engineers
2. Quality Professionals
3. Supervisors
4. Metrology Technicians
5. R&D Engineers
6. Project Engineers

METHODOLOGY

• This workshop will be interactive with a lots of exercises and active participation from audience
• Participants are expected to bring along laptops
• Minitab 18 will be used during the training

COURSE CONTENT

GR&R Course Objectives

• Purpose of Gauge Capability Studies
• Standards
• Traceability
• Test Procedures
• Objectives of GR&R

Basics of measurement – possible variations

• Equipment Variation
• Appraiser Variation
• Measurement System Variation (GR&R)
• Part-Part Variation
• Total Variation

Gage Measurements – possible errors

• Bias
• Accuracy
• Stability
• Linearity
• Repeatability
• Reproducibility

Variable GR&R – short methods

• Study Preparation and Step to carry out this methods
• Example (Short Method)

Variable GR&R – long methods

• Study Preparation and Step to carry out this methods
• Study Execution
• Criteria of Acceptance of GR&R
• Sample of Long Method Data Sheet
• Example (Long Method)

Other GR&R studies

• For destructive measurements
• For attribute measurements
• GR&R with Minitab 18

Improving measurement systems

• Effectiveness E
• Probability of a miss P(Miss)
• Probability of a false alarm P(FA)
• Bias B
• Using problem solving approach to find the root causes of repeatability and reproducibility problems
• Some basic causes to investigate if the gage/instrument repeatability is high
• Some basic causes to investigate if the appraiser reproducibility is high