Engineering drawing is a technical drawing used to define engineered items.

It communicates views, dimensions, and necessary information in a graphical language.

It helps transfer ideas from engineers to workers who manufacture parts.

Used in shipbuilding, automobile aerodynamics, construction, and more.

Drawing board: Rectangular wooden board with a smooth surface for holding drawing paper.

Drawing paper: Should be smaller than the board; fixed using pins or clips.

Pencils: Grades H, 2H, HB are used for accuracy in drawings.

T-square: Used for drawing horizontal straight lines.

Set square: Triangular tool used with a T-square to draw angled lines (30°-60°-90° and 45°-45°-90°).

Scale: Used for measuring and drawing lines of specific lengths.

Protractor: Semicircular tool used to measure and draw angles.

Drafter: Combination of T-square, set square, protractor, and scale for precise drawing.

Roller scale: Used for drawing parallel lines, angles, and circles.

French curves: Used for drawing irregular curves like ellipses and hyperbolas.

Compass: Used for drawing circles and arcs of specific radii.

Eraser: Removes pencil marks without damaging the paper.

Different types of lines are used to convey specific information in drawings.

Lines help to define edges, projections, dimensions, and hidden parts of an object.

Continuous thick line – Used for outlines and edges of objects.

Continuous thin line – Used for dimensions, projections, leaders, and hatching.

Continuous thin freehand line – Used to show short breaks or irregular boundaries.

Continuous thin line with zigzags – Represents long breaks in objects.

Dashed line – Used to indicate hidden edges of an object.

Chain thin long-dotted line – Represents center lines of circles and arcs.

Chain thin line with thick ends – Used to show cutting plane locations.

Engineering drawing is a graphical language used for technical communication.

Various instruments like T-square, set square, and compass aid in drawing precision.

Different lines represent different features of an object.

Understanding drawing tools and line types is essential for creating accurate engineering drawings.