Introduction to Engineering Drawing (AUTOCAD).pdf

Hong Kong Institute of Vocational Education HD in Mechanical Engineers ENG3602 Drafting Design Technology Fundamentals of Drafting - Introduction to Engineering Drawing Objectives: 1. To be aware of the need for engineering drawing in terms of communication. 2. To appreciate BS8888 is one of the standards for engineering drawing practice. 3. To appreciate the need for the different types of drawing. 4. To identify the different types of drawing instrument. 5. To understand the need for standards in presentation and layout. Engineering drawing and communication An engineering drawing is an exact graphical representation of object(s) on paper and is prepared using drawing instrument. It must be clear, concise, and accurate and should be able to communicate between designer and manufacturer or user. Any engineering drawings should convey information completely and unambiguously, including the following: (i) shapes, sizes and position of the drawing component (ii) material of the component (iii) method of manufacture The preparation of engineering drawing always conforms to some national or international standards, and therefore it can be interpreted and understood correctly Engineering drawing is therefore (i) the principal means of communication in industry (ii) an international language of engineering Drawing standards A standard is a technical specification aimed at the promotion of optimum community benefits and approved by a body recognised on the international, national, regional, or company level. Examples of standards: (i) International Organisation for Standardization (ISO) (ii) British Standard (BS) (iii) European Committee for Standardization (CEN) (iv) Japanese Industrial Standards (JIS) When referring to engineering drawing standard, BS 8888 Technical product documentation (TPD) - Specification for defining, specifying and graphically representing products is one of the standards which