Engineering Drawing Instruments

List of Engineering drawing instruments

  1. Drawing board
  2. Drawing Papers
  3. Tee-square
  4. Mini Drafter
  5. Set-square
  6. Engineers Scale
  7. Protractor
  8. French curves
  9. Pencil
  10. Compass
  11. Dividers

1. Drawing Board

Drawing Board
Drawing Board
Drawing Board Sizes
Drawing Board Sizes

2. Drawing Papers

Drawing Paper
Drawing Paper

The size of the drawing sheets to be used depends on the size of the object to be drawn and the scale to be used. The length of the drawing sheet can be horizontal or vertical while drawing.

A2 size of drawing sheet is most convenient for drawing purposes in the class room. The width to length ratio of drawing sheet is1 : 1.414.

Area of A0 drawing sheet is 1.00 square metre.

The standard size as per Bureau of Indian standard (B.I.S) listed below

Drawing Paper Sizes
Drawing Paper Sizes

3. T – Square

T-Square
T-Square
T-Square Use
T-Square Use

4. Mini Drafter

Mini Drafter
Mini Drafter

Mini Drafter is a simple and small shaped instrument of the drafting machine. Now-a-days these are mostly used by the engineering students. All the working functions of T-Square, Set-Square, Protractor, Scales and their merits are co-ordinated in a Mini-Drafter.

5. Set Square

Set Square
Set Square

It is made of transparent celluloid plastic in triangular shape They are available in two types, 300-600 and 450-450.

Set Square Use
Set Square Use

6. Engineers Scale

It is used to make full size, reduced size or enlarged size drawings conveniently, depending upon the size of the object and that of the drawing sheet. They are made of cardboard, plastic and as recommended by Bureau of Indian Standards, are available in set of eight scales. They are designated from M1 to M8.

7. Protractor

It is made of transparent celluloid plastic, available in semi circle or circle.

Protractor
Protractor

8. French Curves

French Curves
French Curves

A French curve is a curved ruler used for drawing irregular curves that are neither circles nor circular arcs. It is made of wood, plastic or transparent celluloid. There are different forms and sizes of French curves.

9. Pencils

Drawing Pencil
Drawing Pencil

10. Compass

Engineering Compass
Engineering Compass

It is used for drawing circles both in pencil and in ink. It consists of two legs hinged at one end. One leg is attached with a steel needle by means of a screw while the other leg is provided with a socket to accommodate interchangeable attachments.

Engineering Compass Uses
Engineering Compass Uses

11. Dividers

Dividers are similar to the compass and are made in square, flat and round forms. Dividers are used for:

Dividers
Dividers
  1. Dividing curved or straight lines into any number of equal parts.
  2. Transferring dimensions from one part of the drawing to another part.
  3. Setting dimensions form the scale to the drawings.
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