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Part One AN INTRODUCTION TO OUALITY CONTROL
Part Two PREPARING FOR SATISFACTORY QUALITY
Quality control of incoming materiel
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100 per cent accept assembly attributes average chart calculation cent inspection Chapter components correct cost decide defective pieces deﬁne difﬁcult drawing limits drift ensure equipment example factory failure rate fault ﬁgures ﬁnal inspection ﬁnd ﬁnished ﬁrst ﬁt ﬂoor frequency distribution curve grand average incoming inspection inspec inspector machine or process manufacture marks mean range method millimetres MTBF Normal Normally distributed number of defectives ohms operator control out-of-limit outer control limits Outer limit patrol inspection percentage of defectives plot possible practice probably process capability production lines quality circles quality control chart quality control system quality engineer quality schedule quality standard range chart rejected reliability resistors sample of ﬁve sample size sampling plan satisfactory scrap shown in Figure speciﬁcation limits speciﬁcation or drawing standard deviation sufﬁcient supplier Suppose tion usually variables variation wrong