What is the purpose of the MSA?

Definition of Measurement Statistical Analysis (MSA) The purpose of MSA is to assure that a selected measurement system delivers reliable results with repeatability and reproducibility. When conducting a PPAP, all measurement systems are identified in the control plan.

What is equipment variation in MSA?

It measures the variation one appraiser has when measuring the same part (and the same characteristic) using the same gage more than one time. This variation is usually referred to as Equipment Variation (EV) in the gage R&R study. This is also called the “within system” variation.

What is the MSA rule?

The rule of thumb for acceptance of a measurement system is a total Gage R&R of 30\% or less of the lessor of Total Variation or the Specification Tolerance. In this case, the measurement system is capable, and can be used as a basis of decision making.

What is MSA testing?

MSA testing allows early detection of tendencies toward disease, toxicity and imbalances due to various types of stress before they become outwardly manifested. The process involves measuring electrical conductivity by touching on acupuncture points (meridian points) on the fingers and toes using a handheld stylus.

What is MSA example?

It can be either in manufacturing or service industries. Some of the examples are automobiles, pharmaceuticals, garment, healthcare, airlines, banks, consulting firms, etc. MSA helps us to find variation due to measurement system itself and guide us to improve the system for measurement.

What is the purpose of a gauge R&R?

Gage repeatability and reproducibility (GR&R) is defined as the process used to evaluate a gauging instrument’s accuracy by ensuring its measurements are repeatable and reproducible.

What is a variable Gage?

Variable gages are those that provide actual measurement deviations. In this way, they provide the data a shop needs to make decisions about process trends, to diagnose manufacturing issues and to learn a little about the form of a part.

What is kappa value in MSA?

Kappa ranges from -1 to +1: A Kappa value of +1 indicates perfect agreement. If Kappa = 0, then agreement is the same as would be expected by chance. If Kappa = -1, then there is perfect disagreement.

How is MSA done?

Obtain at least 10 random samples of parts manufactured during a regular production run. Choose three operators that regularly perform the particular inspection. Have each of the operators measure the sample parts and record the data. Repeat the measurement process three times with each operator using the same parts.

What is bias study in MSA?

MSA studies the error within a measurement system. Bias: a measure of the difference between the true value and the observed value of a part. If the “true” value is unknown, it can be calculated by averaging several measurements with the most accurate measuring equipment available.