Introduction to Engineering Graphics & Design скачать в хорошем качестве

Introduction to Engineering Graphics & Design

Here we are going to Introduce to Engineering Graphics & Design. LINES Technical drawing Lines are used for different purposes to provide specific information for designers, manufacturers, etc. looking at the drawing. The person who will read drawings have to learn what they mean. Line types are also a language type to communicate between technical people. Line styles and types A variety of line styles graphically represent physical objects in engineering practice. Out of them few very important lines are hereunder. • Continuous Thick – are thick continuous lines used to depict edges directly visible from a particular angle. • Continuous Thin – thin continuous line used as construction line, projection line, dimension line etc. • Dashed – are short-dashed lines that may be used to represent edges that are not directly visible. • Chain Thin – are alternately long- and short-dashed lines that may be used to represent the axes of circular features. • Thick-Thin-Thick - are thin lines in a pattern (pattern determined by the material being "cut" or "sectioned") used to indicate surfaces in section views resulting from "cutting." • Break lines - are used to show imaginary breaks in objects. A break line is usually made up of a series of connecting arcs. Two types of breakes lines are there short break line and long break line.Curve Line – is used to depict short break lineZigzag Line - is used to represent long break line. Chain (Continuous) Dimensioning All the dimensions are aligned in such a way that an arrowhead of one dimension touches tip-to-tip the arrowhead of the adjacent dimension. The overall dimension is placed outside the other smaller dimensions Parallel (Progressive) Dimensioning All the dimensions are shown from a common reference line. Obviously, all these dimensions share a common extension line. This method is adopted when dimensions have to be established from a particular datum surface Smaller dimensions should always be placed nearer the view. The next smaller dimension should be placed next and so on. Combined dimensioning When both the methods, i.e., chain dimensioning and parallel dimensioning are used on the same drawing, the method of dimensioning is called combined dimensioning The instruments used in engineering drawing are: 1. Drawing sheet 2. Drawing board 3. Mini drafter 4. T square 5. Compass 6. Divider 7. Set squares 8. Clinograph 9. Protractor 10. French curves References https://www.designingbuildings.co.uk/... https://theconstructor.org/constructi...