Engineering Drawing basics.ppt
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This document provides an overview of engineering drawing and its importance. It discusses that engineering drawing is used to communicate technical information through visualization and established standards and conventions. It highlights that engineering drawing is essential for all engineering disciplines as it provides the roadmaps for manufacturing complex products and structures. The document also describes the basic components used for manual engineering drawings like drawing sheets, instruments, pencils and various geometric shapes and line types used in drawings. It emphasizes that following accepted standards and conventions is important for effective technical communication through engineering drawings.
Engineering Drawing basics.ppt
- 1. HELLO, EVERYONE Created By, Govind B Nadare BE In Mechanical Engineering One Year Experience in Bajaj Auto Ltd. Waluj Aurangabad ‘Engineering Drawing’
- 2. MECHANICAL ENGINEERING What will you learn in this course? You will learn - How industry communicates technical information. • Visualization – the ability to mentally control visual information. • Graphics theory – geometry and projection techniques. • Standards – set of rules that govern how parts are made and technical drawings are represented. • Conventions – commonly accepted practices and methods used for technical drawings. • Tools – devices used to create technical drawings and models. • Applications – the various uses for technical drawings. How drawing is important to all engineering disciplines….. 2
- 3. BASICS + ADVANCED = SUCCESS Basic of Any Subject Is CONSTANT But Not Advanced Importance Without Basics we cant make extraordinary work . Innovation is also Occurred Only Through Basics MECHANICAL ENGINEERING
- 4. Drawing Describing any object/ Information Diagrammatically Engineering Drawing OR Machine Drawing Graphical means of expression of Technical details without the barrier of a Language Diagrams/sketches/pictures – communication skills • We grasp information easily if it is illustrated with diagrams, sketches, pictures, etc. MECHANICAL ENGINEERING 4
- 5. AIRBUS A380 Source: http://img.stern.de/_content/53/96/539645/A3 80_500_artikel_500.jpg MECHANICAL ENGINEERING LCA - the world's smallest, light weight, multi-role supersonic combat aircraft of the world • A picture/drawing is worth a thousand words.. • The LCA/Airbus A380 would be impossible to create without computer graphics and drawing models. •Drawings are the road maps which show how to manufacture products and structures. 5
- 6. Mechanical machine Chemical reactor Civil structure Electrical circuit Important for all Branches MECHANICAL ENGINEERING 6
- 7. MECHANICAL ENGINEERING Graphical representation of an object – Drawing • Engineering drawing – A drawing of an object that contains all information -like actual shape, accurate size, manufacturing methods, etc., required for its construction. -No construction/manufacturing of any (man -made) engineering objects is possible without engineering drawing. 7
- 8. MECHANICAL ENGINEERING Engineering drawing is completely different from artistic drawing, which are used to express aesthetic, philosophical, and abstract ideas. Engineering Drawing has a specific calculation base. How Different From Artistic Drawing???? 8
- 10. MECHANICAL ENGINEERING Items required for drawing Items required for drawing Drawing board Drawing sheet Mini-drafter/drafting machine/ T- square Instrument box containing compass, divider, etc. Scales Protractor French curves Drawing pencils Eraser Drawing clip/pin/adhesive tape Sharpener Duster 11
- 11. MECHANICAL ENGINEERING Last two sizes are normally used for student drawing Drawing board must be placed on the table with working edge always to be at the left side. Working edge 12
- 12. MECHANICAL ENGINEERING Mini-drafter – a miniature version of the drafting machine 13
- 13. MECHANICAL ENGINEERING Mini-drafter fixed on drawing board 14
- 14. MECHANICAL ENGINEERING Some drawing instruments 15
- 15. MECHANICAL ENGINEERING Standard sizes of drawing sheets as per BIS 16
- 16. MECHANICAL ENGINEERING Lay out of a drawing sheet 17
- 17. MECHANICAL ENGINEERING Drawing Pencils Wooden pencils – are graded and designated by numbers and letters Mechanical clutch pencils – Not allowed • 7B, 6B, 5B, 4B, 3B, 2B, B - in decreasing order of softness and blackness • HB to F – Medium grade • H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H – increasing order of hardness. Drawings are done using 2H pencils and finished with H and HB pencils – to be practiced in this course. 18
- 18. MECHANICAL ENGINEERING Uses of different types of lines in a given drawing 19
- 19. Standards and Conventions No effective communication without an agreed upon standard of signs or symbols. Standards and conventions are the alphabet of technical drawing, and plane, solid, and descriptive geometry are the science(grammar) which underlies the graphics language. Following the standard rules (grammar) of any language (Hindi/English) – communication of thought between people becomes easier. If words in a sentence were presented randomly – understanding becomes very difficult. For effective communication of technical (graphics) information– set of standards and conventions – a must. Standards and Conventions – very important MECHANICAL ENGINEERING 21
- 20. Conventions – commonly accepted practices, rules, or methods. Dashed lines are used to represent hidden features of an engineering drawing.. Hidden lines – location of drilled hole’s diameter, in a view where the hole cannot be directly seen. MECHANICAL ENGINEERING 22
- 21. Drawings are dimensioned using an accepted set of standards such as placing the dimension text such that it is read from the bottom of the sheet. Standards – set of rules that govern how technical drawings are represented.. 23
- 22. Drawing standards ANSI – American National Standards Institute ANSI Y14.1 1980 (R1987) – Drawing sheet size and format ANSI Y 14.2M-1979 (R1987) – Line conventions and lettering ANSI Y14.5M-1982(R1988) – Dimensioning and tolerances ANSI Y 14.3-1975(R1987) – Multi view and sectional view drawings ISO – International Standards Organization JIS – Japanese Standards BIS – Bureau of Indian Standards MECHANICAL ENGINEERING 24
- 23. Basic geometric shapes used in drawing 25
- 27. Arrows – 3 mm wide and should be 1/3rd as wide as they are long - symbols placed at the end of dimension lines to show the limits of the dimension. Arrows are uniform in size and style, regardless of the size of the drawing. MECHANICAL ENGINEERING 32
- 28. Aligned method Unidirectional method MECHANICAL ENGINEERING 33
- 29. Angle Of PROJECTION: Popular only TWO types 1)First Angle Projection 2)Third Angle Projection MECHANICAL ENGINEERING 34
- 30. Thank you…………………. Any Question????? MECHANICAL ENGINEERING If any doubt then text me -- [email protected] 8390214842 35