Abstract
The most common type of varying number that arises in production or inspection is the measurement. Measurements are made on quantities as length of a hub, inside or outside diameter of a cylinder, electrical characteristics, such as capacitance, temperature, weight, tensile strength of a material, or the time taken by a certain operation.
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Notes
- 1.
The unit of product is the entity inspected to determine its measurable quality characteristic. This may or may not be the same as the unit of purchase, production or shipment.
- 2.
Originally there have been three pairs of limits: (1) specifications connected to engineering, (2) so-called “tolerance”, reflecting process capabilities through an algorithm, and (3) control pertaining to operations. This abundance of limits does not provide clarity in the production line with clear guidance.In this book, the terms tolerance and specifications limits are used interchangeably and they reflect values and other conditions set by engineering design. By contrast, control limits pertain to the production process, its machines, their fine-tuning, the skills of people and results from operation.
- 3.
6 s should not be confused with 6 σ in Chap. 7. In the present case it comes from \( \overline{x} \) ± 3s.
- 4.
Emphasis added.
Reference
Weizmann Institute of Science (2003), Annual report 2003
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© 2013 Springer-Verlag London
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Chorafas, D.N. (2013). Quality Control Charts by Variables. In: Quality Control Applications. Springer Series in Reliability Engineering. Springer, London. https://doi.org/10.1007/978-1-4471-2966-0_13
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DOI: https://doi.org/10.1007/978-1-4471-2966-0_13
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