NBN ISO 22514-3:2021

This document describes the steps for conducting short-term performance studies that are typically
performed on machines (including devices, appliances, apparatuses) where parts produced
consecutively under repeatability conditions are considered. The number of observations to be analysed
vary according to the patterns the data produce, or if the runs (the rate at which items are produced)
on the machine are low in quantity. The methods are not considered suitable where the sample size
produced is less than 30 observations. Methods for handling the data and carrying out the calculations
are described. In addition, machine performance indices and the actions required at the conclusion of a
machine performance study are described.
This document is not applicable when tool wear patterns are expected to be present during the duration
of the study, nor if autocorrelation between observations is present. The situation where a machine has
captured the data, sometimes thousands of data points collected in a minute, is not considered suitable
for the application of this document.