BS ISO 26303:2022 – TC

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Tracked Changes. Machine tools. Short-term capability evaluation of machining processes on metal-cutting machine tools

Published By	Publication Date	Number of Pages
BSI	2022	154

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Categories: 25.080.01 - Machine tools in general, BSI

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PDF Catalog

PDF Pages	PDF Title
1	30464656
101	A-30421429
102	undefined
106	Foreword
107	Introduction
109	1 Scope 2 Normative references 3 Terms and definitions
112	4 Symbols 4.1 Uppercase letters
113	4.2 Lowercase letters 4.3 Greek letters
114	5 Preliminary remarks
115	6 Procedure for short-term capability evaluation 6.1 General Figure 1 — Basic procedure for short-term capability evaluation
116	6.2 Agreements
117	Table 1 — Recommended values for short-term process capability parameters
118	6.3 Warm-up procedure 6.4 Adjustment
119	6.5 Production 6.6 Measurement
120	6.7 Computation and analysis 6.7.1 General
121	Figure 2 — Evaluation diagram
122	6.7.2 Trend correction
123	6.7.3 Outlier management 6.7.4 Stability of the process
124	6.7.5 Calculation of indices 6.7.5.1 General
125	6.7.5.2 One-sided limited features 6.7.5.3 Surface roughness values 7 Factors influencing short-term capability evaluation 7.1 General
126	Table 2 — Factors influencing short-term capability evaluation 7.2 Thermal influences
127	7.3 Influences due to measuring uncertainty 7.4 Influences arising from statistical analysis 7.4.1 Confidence level and sample size 7.4.2 Type of distribution
129	Annex A (informative) Additional information related to statistical evaluations A.1 Relationship between centred and shifted distributions Figure A.1 — Short-term capability and shifted distribution
131	A.2 Correlation between short-term range values, RV,s, and standard deviation
132	Figure A.2 — Comparison of characteristic values for normal distribution
133	A.3 Mean value not in the middle of the tolerance zone Figure A.3 — Effects if the mean value is not in the middle of the tolerance zone (offset of the mean value) A.4 Measurement uncertainty and short-term capability index
134	Figure A.4 — Change of capability index by standard deviation of measuring device Figure A.5 — Standard deviation of measuring device and minimum tolerance
135	A.5 Confidence level and sample size Figure A.6 — Confidence level and sample size, n, under the assumption of normal distribution of the characteristic values A.6 Type of distribution and capability index evaluation
136	Figure A.7 — Influence of selected type of distribution
137	Annex B (informative) Agreement forms
141	Annex C (informative) Evaluation forms
145	Annex D (informative) Examples of capability agreements and analysis
153	Bibliography