Tag Archives: Scale Factors

Overview of Engineering Drawing

Drawings on a table
Manual Engineering Drawing(Photo credit: Wikipedia)

When I decided to study engineering what I study the most was not calculus, mechanics or linear algebra but engineering drawing and it was because I didn’t pay attention in my primary classes. Scale was never my good friend I never made a straight line but still determined to do well in drawing.

After studying engineering drawing in 2 out of 3 semesters, I was pretty satisfied from my performance and did much better from what I thought. Engineering Drawing is one of the most significant subject of engineering and one of the most attracting subjects for non engineering colleagues. It’s a language of engineers.  The concept of Engineering Drawing is best conveyed from paper and pencil and not the Auto Computer Aided Design (Auto CAD). Today, many engineers designers use Auto cad and somewhat is mandatory but they learn the concept of drawing through practicing on boards.

Tools of Manual Engineering Drawing:

In engineering Drawing we need a pencil (H pencils are most used in drawing), eraser, T-Square(use for drawing horizontal lines and alignment), Set Squares(use for vertical lines), protector, French curves, Engineering Drawing Board, Drawing Sheets(Half Imperial and Full Imperial) ,Interpret Scales, simple calculator and pins.

Before start drawing a single line you should know two things one is the unit(s) (ft, inches, cm or mm) you will be working in it and secondly Scale Factor

 Scale Factors:

Most important terminology in engineering drawing is scale factor it very important for a designer to know, how to design the land area or a machine part or any real size object on the paper by using proper scale factors?

Let’s suppose for planning a 400 sq. yards (3600 sq. ft) on A-4 size paper you can use 1/8 scale factor, In full imperial sheet can use as ¼ (4 feet to an inch) or 3/8 scale factor.

Also some small object like nut and bolt of small sizes we adopt big scale to magnify it i.e. (1/2” to 1’).

The sheet or paper must be properly used and the idea of drawing must be easily conveyed.

Starting a drawing:

* The Paper or sheet must placed on the board such that no rolling or air get between the paper and the board.

* The paper must be aligned with the board, Check from the bottom as well as on the top by using a ‘T Square’ and fixing it to one end.

After alignment placed the paper tape or pins on 4 sides of paper.

*Start drawing.


* Giving a space at most right for scheduling and detailing of objects will give a good impression.

* Scale factors must be prominent.

* Make sure that no food items or even sweat come closer to it, will make your drawing dirty and spoil your presentation. 😀

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