Introduction to engineering drawing modified
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Transcript of Introduction to engineering drawing modified
THINK ONCE… IS YOUR DISPOSABLE (PLASTIC) GLASS
CLEANED AFTER ITS MANUFACTURE..??
…..IT CONTAINS ARSENIC DUST..…REALLY A CANCER REAGENT…
…IF ANY HOT…LIQUID POUR IN IT…IT(Arsenic) GET DISSOLVED.
Introduction to Engineering Drawing
Why Drawings are needed?What is an Engineering Drawing?
Is an Universal LanguageStandardized conventions for layout, nomenclature, interpretation, appearanceDeals with PreciseIn technical nature
Introduction to Engineering Drawing
Specification
Initial Design
Evaluate Design
Design Satisfy Specification ?
Modify Design
Data for
Production
Drawing Types
• Types of Engineering Drawings• General Classification
1. Free hand sketch2. Orthographic Projection
a. 1st angle Projectionb. 2nd angle projectionc. 3rd angle Projectiond. 4th angle Projection
3. Pictorial views– Isometric views– Oblique views
4. Perspective views
Drawing Types1. Free hand sketch
Drawing Types1. Orthographic Projection
Orthographic Projection
First AngleFirst Angle
Orthographic Projection
Third AngleThird Angle
Isometric Projection
Oblique Views
Perspective Views
But the realistic view (Naked Eye) is containing not parallel lines but lines appear to be converge & meet at a point.
Perspective Views
Perspective Views
Two Point Perspective
Vanishing point
Manual Drafting
Important points
• Standards Use– ISO 2768, BS 8888, ANCI –Y14– Sri Lanka Standard 409: 1977
• Paper Sizes
Line Types
Sectional Views
Important Points
– Name of the Item– Drawing Number– Drawn, approved and verified by.– Original scale– Date of the drawing– Signatures– Copyrights clause– Projection symbol– Unit of measurement– Drawing practice standard
DimensioningLinear Dimensioning
Angular Dimensioning
CHAIN-PARALLEL DIMENSIONING
Dimensioning Diameters
Dimensioning Holes
ThreadsThreads
YOUR CHEWING GUM CONTAINS …..
Appropriately, the stomach and intestines may become exhausted. So, concerns about stomach burns, ulcers and risks of different cancers arise.
ANIMAL FAT (Intestines)……..