Engineering Drawing Flashcards
The graphical representation of any object or idea. It can be prepared either using free hand or using engineering instruments or using computer program.
Drawing
2 Types of Drawing
- Artistic Drawing
- Engineering Drawing
The drawing representing any object or idea which is sketched in free hand using imagination of artist and in which proper scaling and dimensioning is not maintained.
Artistic Drawing
A graphical language used by engineers and other technical personnel associated with the engineering profession which fully and clearly defines the requirements for engineered items.
Engineering Drawing
It is a two-dimensional representation of a three-dimensional object.
Engineering Drawing
An engineering drawing provides al information about:
- Size
- Shape
- Surface type
- materials etc. of the object
Application of Engineering Drawing
- It is used in ships for navigation.
- For manufacturing of machines, automobiles, etc.
- For the construction of buildings, roads, bridges, dams, electrical and telecommunication structures etc.
- For manufacturing of electric appliances like TV, phone, computers, and etc.
4 Types of Technical Drawing in the Field of Engineering
- Geometrical Drawing
- Mechanical Engineering Drawing
- Civil Engineering Drawing
- Electrical & Electronics Engineering Drawing etc.
The art of representing geometric objects such as rectangles, squares, cubes, cones, cylinders, spheres etc. on paper
Geometric Drawing
If the object has only 2 dimension i.e. length and breadth (as rectangles, squares, triangles, etc.)
Plane Geometrical Drawing
If it has 3 dimension i.e. length, breadth, and thickness/depth (as cube, prism, sphere, cylinder, etc.)
Solid Geometrical Drawing
It shows the position of different objects and elements of the structure in a two-dimensional view. Only the length and width of objects are shown here.
Plan
It shows a view along the height of the structure. Elevation can be presented in 2D or 3D. In the 2D elevation view, either height and length or height and width are show.
Elevation and Section
It shows the detailed requirement of reinforcement and their arrangement in structure. It also shows the specification and properties of construction materials like concrete, steel, timber etc.
Structural Drawing
ISO
International Organization for Standardization - Worldwide
ANSI
American National Standards Institute - USA
JIS
Japanese Industrial Standards - JIS
BS
British Standards - UK
Drawing Instruments
- Drawing Board
- Drawing Paper
- Pencil
- Rubber/Eraser
- T-square
- Set-square
- Instrument Box
- Protractor
- Compass
- Scales
- Pins and clips
- Adhesive tapes
- French curves
Paper Types
- Detail Paper
- White Drawing Paper
- Tracing Paper
Used to draw horizontal straight line
T-square
Used to guide the triangles when drawing vertical and inclined lines
T-square
Used to construct the most common angles (i.e. 30°, 45°, 60°) in technical drawings
Set-square
Used to draw parallel and perpendicular lines quickly and conveniently
Set-square
It is used for laying out and measuring angle
Protractor
A number of kinds of scale are available for varied types of engineering design
Scale (ruler)
It is used to draw circles and both in pencil and ink. It consists of two legs pivoted at the top. One leg is equipped with a steel needle attached with a screw, and other shorter leg is, provided with a socket for detachable inserts.
Compass
Used chiefly for transferring distances and occasionally for driving spaces into equal parts. i.e. for dividing curved and straight lines into any number of equal parts, and for transferring measurements.
Dividers
Used for pencil work
Detail Paper
Used for finished drawing
White Drawing Paper
Used for both pencil and ink work and useful for replicating a master copy
Tracing paper
To indicate all visible outlines/boundary of an object. It shows the shape of an object
Visible line/ Object line
To represent hidden edge of an object. They should end on both sides by touching the visible lines and should touch themselves at intersection
Hidden line/dashed line
To show a line passing through center of hole, pitch line etc
Center line
To show dimension of an object
Extension line, Dimension line and leaders
To indicate cut portion of an object
Section line
To show imaginary cutting of an object
Section line
To show imaginary cutting of an object
Cutting plane line
To show break of an object in order to shorten the view of a long part
Break lines
To show alternate position of an object of the position of an adjacent part
Phantom line/Repeat line
