BS308 PDF

But did You know that it is no longer current? The UK was the first country to adopt a national standard for technical drawing. Before the industrial revolution it was common place for workmen to work from prototypes. With the coming of the steam age it became clear that standard parts and components would be required to allow mass manufacture.

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This was BS , which in one edition or another came to be found on the book shelves of almost every design, manufacturing and inspection department in the country. BS was also widely used overseas, throughout the British Commonwealth. BS was developed, revised and expanded over the years. Changes to the standard came about as it was extended to cover new areas, and to keep abreast of technological development and changes in working practice. In , it was split into the three parts that many engineers and designers are familiar with.

Meanwhile, ISO was developing international standards for engineering drawing and tolerancing. In a number of cases, ISO standards were developed to cover particular topics before any corresponding coverage was developed for BS Eventually, the system of ISO standards became sufficiently comprehensive to cover every technical topic which was covered by BS At best, BS would now simply duplicate the ISO standards, and at worst, it would contradict them in some area; the justification for maintaining an independent British Standard for mechanical specification had now disappeared.

The withdrawal of BS took place in Designers and engineers now had to make use of the extensive catalogue of ISO standards that cover different aspects of Technical Product Specification.

In order to make this transition as painless as possible, BSI produced a new document as an index to the ISO system, to help end-users find their way around it.

This document is the standard known as BS It was in effect just an expensive shopping list. Instead of just listing the ISO standards which deal with a subject, BS , in many areas, now reproduces much of the content of those ISO standards. The aim of the standard is no longer simply to index the ISO system, but also to make directly available much of the key material of the ISO standards directly, all in one place.

In this way, the standard seeks to make the ISO system much more accessible and far more useable. The first revision to take a major step in this direction was the revision. Two more revisions have been published sine then, each taking this approach furthere. The latest version is BS In some ways, BS has returned to its BS roots, and is once again a document which provides rules, definitions and guidance for those involved in creating or interpreting technical specifications.

BS - What does it mean in practice? There are a number of changes and developments to working practices, many of which would have been introduced through a new version of BS if it had not been withdrawn. Principle changes can be summarized as follows The standards cover more than just engineering drawing, they cover all aspects of technical product specification, including, for instance, the use of 3D CAD models to define component geometry.

Requirements for drawing borders and title blocks have been formalised and changed in some areas The comma is to be used as a decimal marker instead of the full stop. Size tolerances should be interpreted in accordance with ISO i. The use of dimensions, size tolerances, datums, geometrical tolerances, edge and surface specifications have been formalised and systematised under the heading of Geometrical Product Specification GPS.

This approach is the driving philosophy behind BS and the current generation of ISO standards, and industry will potentially benefit enormously from its adoption. Standards organisations The benefits of standardisation became widely recognised during the industrial revolution. In the first quarter of the 20th century, national standards institutions started to appear to manage and advance this process in most of the major industrialized nations. As industries developed to address global markets, and supplier bases expanded across national boundaries, the value of international standards, or at least harmonisation between national standards, became apparent.

To address this need, a number of the major national standards bodies formed a federation known as the International Organization for Standardization. As the initials of this organisation could vary when the name was translated into different languages, the initials ISO were adopted as a universal acronym for its name. The federation has grown considerably since those early days, and now over nations are represented in its membership.

Engineering Drawing Standards The standards which govern mechanical engineering specification have become rationalised over recent decades, and there are now two systems of standards which are used almost universally.

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