BS8888
BS8888 is a British standard that provides guidelines for technical product documentation, including engineering drawings, specifications, and other technical documents. It covers aspects such as drawing layout, dimensioning, tolerancing, and symbols. The standard aims to ensure consistency and clarity in technical communication within the engineering and manufacturing industries.
3 Key excerpts on "BS8888"
eBook - ePub- Bruce Black(Author)
- 2015(Publication Date)
- Routledge(Publisher)
...The standardisation can be the information contained on a drawing, the layout of the drawing, the standardisation of sizes or of parts. This standardisation can be adopted within an individual firm or group of firms, or within an industry, e.g. construction, shipbuilding, etc. nationally by adopting British Standards (BS), throughout Europe (EN) or internationally through ISO. British Standard BS 8888 provides the unified standards through which all this information can be presented clearly. Guides to the use of BS 8888 are available for schools and colleges and for further and higher education as PP 8888 parts 1 and 2. Adopting a system of standard specification, practices and design results in a number of advantages: reduction in design costs; reduction in cost of product; redundant items and sizes are eliminated; designs are more efficient; level of interchangeability is increased; mass-production techniques can be adopted; purchasing is simplified; control of quality is enhanced; spares can be easily obtained; costing can be simplified; overheads are reduced. Except for written notes, technical drawings have no language barriers. They provide the universal language for design, for the craftsman and the technician in manufacture, assembly and maintenance, for the sales team as an aid to selling and for the customer before buying or indeed servicing after purchase. 21.2 Communicating technical information Many different methods are used to communicate technical information. The method chosen will depend on how much information has to be dispensed and its complexity. Whichever method is chosen the all-important factor is that the information is simply presented, easy to understand and unambiguous. 21.2.1 Technical drawings Technical drawings can vary from thumbnail sketches to illustrate a particular piece of information through pictorial drawings in isometric or oblique projection to major detail and assembly drawings...
eBook - ePub- K. L. Richards(Author)
- 2020(Publication Date)
- CRC Press(Publisher)
...Where BS 308 had provided guidance, explanations and examples on various topics, BS 8888 simply listed the ISO standards which now dealt with that topic. It was in effect just an expensive shopping list. In recent years, BSI has changed their approach. In some ways, BS 8888 has returned to its original BS 308 format and is once again a document which provides rules, definitions and guidance for those involved in creating or interpreting technical specifications. 2.2 Classification of Engineering Drawings There are a number of different types of engineering drawings, each of which meets a particular purpose. There are typically nine types of drawings in common use which will be discussed in the following sections. 2.2.1 A Design Layout Drawing (or a Design Scheme) This type of drawing that is generally to scale depicts the basic layout of a proposed design, meeting the requirements of the design brief. There may be a number of layout drawings covering various proposals. 2.2.2 A Detailed Drawing This drawing is also referred to as a component drawing and contains all the necessary information for the part to be manufactured, e.g., dimensions, tolerances, surface finishes and treatments. 2.2.3 Tabular Drawing A tabular drawing covers a component that has a common form but can be manufactured in a range of sizes. The variable dimensions are listed in a tabular form. 2.2.4 Assembly Drawing This type of drawing shows the individual parts that make up the assembly combined together. Generally, an item list is included on the drawing or is referred to. Only information relating to the assembly is included on the drawing such as fitting instructions or dimensions that must be adhered to are allowed on this type of drawing. 2.2.5 Combined Drawing In some cases this may be drawn as a combined part and assembly drawing together with all the manufacturing details and a tabulated parts list...
eBook - ePub- Clifford Matthews(Author)
- 2011(Publication Date)
- Wiley-Blackwell(Publisher)
...British Standard 8888: 2008 contains accepted methods and symbols. Figure 4.3 4.3 Toleranced Dimensions In designing any engineering component it is necessary to decide which dimensions will be toleranced. This is predominantly an exercise in necessity – only those dimensions that must be tightly controlled, to preserve the functionality of the component, should be toleranced. Too many toleranced dimensions will increase significantly the manufacturing costs and may result in ‘tolerance clash’, where a dimension derived from other toleranced dimensions can have several contradictory values. Figure 4.4 4.4 General Tolerances It is a sound principle of engineering practice that in any machine design there will only be a small number of toleranced features. The remainder of the dimensions will not be critical. There are two ways to deal with this: first, an engineering drawing or sketch can be annotated to specify that a general tolerance should apply to features where no specific tolerance is mentioned. This is often expressed as ± 0.5 mm. Alternatively, the drawing can make reference to a ‘general tolerance’ standard such as BS EN 22768 which gives typical tolerances for linear dimensions as shown. 4.5 Holes The tolerancing of holes depends on whether they are made in thin sheet (up to about 3 mm thick) or in thicker plate material. In thin material, only two toleranced dimensions are required: Size A toleranced diameter of the hole, showing the maximum and minimum allowable dimensions. Position Position can be located with reference to a datum and/or its spacing from an adjacent hole...
