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BS ISO 22514-3:2020

BS ISO 22514-3:2020

$142.49

Statistical methods in process management. Capability and performance – Machine performance studies for measured data on discrete parts

Published By Publication Date Number of Pages
BSI 2020 28
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
10 5 Pre-conditions for application
5.1 General
5.2 Number of parts to be used in the study
11 5.3 Materials to be used
5.4 Measurement system
5.5 Running the study
5.6 Special circumstances
6 Data collection
6.1 Traceability of data
12 6.2 Retention of specimens
6.3 Data recording
7 Analysis
7.1 General
7.2 Run chart
7.2.1 Purpose
7.2.2 Review the plot
13 7.3 Analyse the pattern of the data
7.3.1 Software approach
14 7.3.2 Check the pattern of the data
7.3.3 Summarize the data
7.3.4 Manual approach
17 7.4 Produce a probability plot
7.4.1 General
7.4.2 Analyse the data
18 7.5 Special cases
7.5.1 Data indicate a skewed distribution
19 7.5.2 Bimodal data
20 7.5.3 Truncated data
21 7.5.4 Censored data
7.6 Calculation of machine performance indices
7.6.1 General procedure
22 7.6.2 Data following a normal distribution
8 Reporting
8.1 Test report
23 8.2 Confidence intervals
8.2.1 General
8.2.2 Indices calculated with the data following a normal distribution
24 8.2.3 Indices calculated with data following a non-normal distribution
9 Actions following a machine performance study
25 Annex A (informative) Tables and worksheets
27 Bibliography

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BS ISO 22514-3:2020
$142.49