Mechanical engineers reference book by A. Parrish and F. J. Camm

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Mechanical Engineers Reference Book

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Preface to Mechanical Engineers Reference Book

The introduction of SI Metric Units has necessitated considerable modifications to British Standards and other National Standards and it is essential that technical literature should reflect or anticipate these changes.

This is the principal objective of the eleventh edition of the Mechanical Engineer’s Reference Book which has been completely revised;

all quantities have been given in SI units only, even though in some instances the original sources of the information are in the inch or MKSA systems.

It is hoped that this book will meet the needs of technologists and other management personnel in the Mechanical, Chemical and Production engineering disciplines.

It should also prove valuable to Metallurgists, Welding Engineers and College Lecturers and Students.

The contributors who are drawn from Industry, Trades and Research Associations and Educational bodies have dealt with the technology in sufficient depth to give a thorough coverage of the sqbject which will be readily understood by the reader.

Further information is given by means of numerous tables and illustrations.

An extensive bibliography is included in each section which gives reference to national and international recommended literature and standards covering the subject matter.

Much of the technology is common to many countries, furthered by the work of the International Standards Bodies and the actions now being taken for the removal of barriers to trade.

Many of the British Standards which are referred to in the text may therefore be compared with the standards of other National bodies.

Absolute units at first present difficulty to those accustomed to gravitational inch and metric systems and it takes use to become familiar with the concept of a newton or a pascal as a force or pressure/stress unit.

This is probably because the gravitational systems do not differentiate between the units for loads (mass) and forces.

The expressions, however, are more readily understood when the units are in the coherent (SI) system and are not confused by the many special names used in the older systems.

No attempt has been made to convert empirical data to another system of units and, indeed, it is not advisable to do this unilaterally.

A case in point is gearing, where the British Standards are not yet fully converted to SI. Some of the product designations are based on the former unit systems·

as, for example, pipe sizes (nominal) which retain the inch nominal sizes in the metric standards and ISO metric bolts and nuts which are based on the material stresses in kgf units.

These descriptions do not prevent the use of SI units for expressing the properties of the products.

This book describes a wide variety of engineering subjects and reflects the established practices and technology in metric terms in the U.K.

and at International level so far as it is at present practicable to do so.

Extracts from British Standard publications are reproduced by permission of the British Standards Institution, 2 Park Street, London WlA 2BS from whom copies of the complete publication may be obtained.

BY: A. PARRISH

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