Better safe than sorry

Article Abstract:

Fasteners loosen from their torque when dynamic and thermal cycling occurs, so locking fastners are a good innovation. One kind of locking fastener is the lock-nut, which can be used on delicate assembly parts, such as plastic panels. The disadvantag of the nut is that two are needed, making assembly more difficult. Free running lock-nuts lock only when they meet the component face, and are suitable when intermittent shock loads occur. Castellated or slotted nuts are suitable for keeping a fastener its in position. Constant torque lock-nuts are suitable for dealing with vibration and loads which are constantly changing. Other features of the locking fasteners are also discussed.

Evaluation, Fasteners

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Better by design

Article Abstract:

A plan of Asnieres sur Oise, France, has been published in order to protect the traditional character of the town's buildings. The plan includes a preface by the environment minister of France. Asnieres has a population of only 2,400 and it is located close to Paris. Although regulations for local land-use are included in the Plan d'Occupation des Sols (POS), the document fails to account for the particular characteristics of a locality such as Asnieres. Details of the development of the local plan are given.

France, City planning, Urban planning

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Some days are better than others

Article Abstract:

Monitoring of plant efficiency requires an accurate interpretation of the data the companies have acquired in their research. A process-behavior chart, which starts with a time-series graph, can help companies correctly interpret plant efficiency by producing computed limits. The key to the process-behavior chart's effectivity is the manner in which the limits are assessed.

Plant Engineering-Management, Methods, Measurement, Industrial efficiency, Economic efficiency, Plant engineering (Facilities), Factory management, Plant engineering

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