Measurement Systems Analysis 2018 - Measurement Systems Analysis

Description :
Calibration of gages and instruments is a familiar activity whose purpose is to determine whether the gages in question return, on average, the same dimensions as the standards against which they are calibrated. This is required by ISO 9001. Calibration does not, however, ensure or even measure precision; the consistency with which the gages return the dimension in question. This is the purpose of measurement systems analysis (MSA), or gage reproducibility and repeatability (R&R).
Even if MSA is not required, it is highly advisable because lack of gage precision can allow the acceptance of borderline nonconforming parts, and reject parts that are borderline conforming. Lack of gage precision also makes statistical process control (SPC) charts less likely to detect process shifts