The replacement of BS

Formerly, the Chief Designer and the drawing office set, and were responsible for, company manufacturing standards and procedures, for other disciples to follow. This practice gradually eroded away because of the advancement of progressive and sophisticated techniques in the manufacturing and verification fields.

Increasing commercial pressure for Design for Manufacture and Design for Inspection, created the demand for equal status. During the period separate standards were gradually developed for design, manufacture and measurement. Each discipline utilized similar terms but often with slightly different interpretations despite their apparent commonality.

An urgent need to harmonize the meaning of these terms was recognized by ISO. An international meeting in 1989 formed a Joint Harmonization Group.

The Danish Standards Association funded a project to bring all design, measurement, and metrology standards together using definitions common to all, but with appendices for each discipline.

A full ISO committee (ISO/TC 213) was formed, with the Danish being responsible for the secretariat. The task allocated to this very vibrant committee progressed considerably, with many new international standards being published.

A major happening that would affect the future of BS 308 was the UK's agreement in 1993 with the European Standards Authority (CEN), whereby BSI would withdraw standards relating to technical drawing in favour of the implemented ISO standards covering the same subject. Initially, BSI systematically withdrew various clauses of BS 308 as the relevant ISO Standards were introduced.

PD 308 was introduced in June 1996 as a guidance document to assist the transition from BS 308 to the implementation of ISO drawing standards. In 1999, as was the case in 1927, major decisions were deemed necessary, and the following were made:

• To transfer the United Kingdom totally to the ISO Standards base.

• To prepare an applications standard to serve as both a specification for specifying and graphically representing products, and as a route map to the ISO Standards.

From this positive commitment, BS 8888 was created and published on 15 August 2000.

The complete comprehensive title of BS 8888 is:

BS 8888. Technical product documentation (TPD). Specification for defining, specifying and graphically representing products.

Basic differences

The fundamental differences between BS 308 and BS

8888 are:

• The title: Technical product documentation (TPD) Specification for defining, specifying and graphically representing products.

• Confirmation of the conventional use of the comma as the decimal marker.

• BS 308 was a Code of Practice, a guidance document. BS 8888 is essentially an applications specification, providing a route map to 106 ISO standards. The operative word is 'specification'. BS 8888 carried forward and contains a significant number of valuable clauses contained in BS 308, which, at present, is not in any ISO documentation.

• BS 8888 is capable of accommodating significant technical changes, known to be in development, plus the facility to accommodate future additions and changes.

• With 106 related ISO standards, BS 8888 has a much broader field of application than its predecessor and its 30 related ISO standards.

• BS 8888 provides common understanding, and acceptance between the designer and the metrologist of 'uncertainty'. These are caused by differences between the Design Intent Measurand (Characteristics Specification) and the Measured Value (Characteristics Evaluation) of the actual manufactured part.

• BS 8888 is a uniform source of reference and will be regularly updated to keep abreast of developments as new international standards are finalized and implemented.

• It will capture any fundamental changes and will reflect moves towards an integrated system for definition, manufacture and verification.

• BS 8888 links each standard to the appropriate stage of the design process and lays the foundations for future development.

BS 8888 will be revised every two years.

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Responses

  • johannes
    How bs8888 was formed?
    8 years ago

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