J. Murdoch (auth.)'s Control Charts PDF

By J. Murdoch (auth.)

ISBN-10: 0333264126

ISBN-13: 9780333264126

ISBN-10: 1349162388

ISBN-13: 9781349162383

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10- a condition seldom met in quality control. 1 British Standard Attribute Control Charts Attribute measures of quality are obtained by means of gofno go gauging or, if the product is classified either objectively or subjectively into acceptable or not. , of the product is subjective judgement of the individual inspector. Having calculated the process capability, the data for maintaining control are obtained by taking samples at specified intervals and plotting the results on a control chart. There are two basic types of attribute control chart, the 'p' chart, or fraction defective, and the 'C' chart, the number of defects in the sample, and either can be used, depending on circumstances.

Jennett. Dr. Shewhart suggested that the control chart should have three main objectives. (1) To defme the goal or 'standard' for a process which management should strive to attain. (2) To be used as an aid to the attaining of this standard. (3) To serve as a basis for judging whether the standard has been achieved. Thus the control chart concepts of Shewhart cover the fields of product specification, production and inspection, and when used, assist in integrating these phases of industry. 2 Basic Concepts of Shewhart Control Charts U in a process, the only sources of variation are chance variations, then these chance variations plotted against time will behave in a random manner.

L. if process average changes to: (i) (ii) (iii) 10% defective 8% defective 6% defective? L. 1355 average to detect the change to 10% defective. L. L. L. 010 kg. 005 kg. 002 kg. 3). 4). 0 Area outside lower limit= neg. 02275 . 5). 002 . 6 Area outside upper 11m1t = 0. 4 Area outside lower limit= neg. L. 00466 = 215 samples. 3 Summary This measure, the Average Run Length, the average number of samples required to detect a given change, gives the basis for assessing the effectiveness of different control schemes and in Chapter 8 it is used to give a comparison of the effectiveness of the Shewhart schemes with the relatively new CuSum control schemes (Chapters 6 and 7).

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Control Charts by J. Murdoch (auth.)

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