Draughtsman Mechanical, Engineering Drawing, Mini Drafter

Draughtsman: Mechanical

 Drawing Board

Drawing Board use wood - planks and white pine

Standard size of Drawing Board

Below chart drawing Board standard size

Drawing board size

 Set square

use - sectioning line

          Drawing inking

          Tracing

 T Square

use - Horizontal, parallel, vertical and inclined line draw

Standard size of T square

T square

 set square

use - sectioning line, drawing inking and tracing

 french curve

use - curved shape draw

 clenograph

use -

parallel lines draw of various angles

it's called adjustable set square

 proportional divider

use-

small and large size drawing

 engineering scale

use-

small and large size drawing drawn respect to original drawing.

 crow quill pen

use-

free hand inking line and curve draw

 erograph

use-

same thikness line draw

 it's called technical and drawing pen

 Drawing sheet

area of A0 drawing sheet = 1 square metres

size of Drawing sheet

Drawing sheet size

 paragraph

use-

 similar to scale

used in survey drawing

 planimeter

use-

find area of Drawing

use in survey

.

 Lettering

 IS:696

 Gothick Lettering - it's              modified form of modern Roman.

 Its use mechanical drawing

 Ratio of word-

6:5 and 7:5

Where first value denote height and second value width

 It's generally used main heading

 Italic Lettering - 

In this use 75° angle

 Space between two letters 1/4 of Hight

 Number Lettering-

Ratio- 6:5 and 7:4

Where first value denote length and second value width

 Conventional line-

 Thick line-0.6 mm to 1 mm

 Medium line-0.4 mm to 0.5 mm

 Thin line-0.2 mm to 0.3 mm

 Scales-

 Representative fraction- it's ratio of distance between two points in the drawing and original distance between two points.

Example:-1/100

Its mean 1 unit represent in the map equal to 100 unit of the ground.

Scale

Types of scales

According to syllabus-

1. Plane scale

2. Comparative scale

3. Diagonal scale

4. Chord scale

5. Vernier scale

6. Isometric scale