Drawing instruments : Drawing board
Drawing board is one of the main equipment of Draughtsman. It is used for supporting the drawing paper/tracing paper for making drawings. It is made of well seasoned wood strips of about 25 mm thick or masonite, free from knots and warping. It should be softer enough to allow insertion and removal of drawing pins. Two battens are fastened to the board by screws, in slotted joints. They prevent warping and at the same time permit expansion and contraction of the strips due to the change of moisture in the atmosphere.
One of the shorter edges of the drawing board, is provided with an “ebony edge” (hard wood) fitted perfectly straight. Standard drawing boards are designated as follows as per IS:1444-1989.
| Sl. No. | Designation | Size (mm) |
|---|---|---|
| 1 | D0 | 1500 x 1000 x 25 |
| 2 | D1 | 1000 x 700 x 25 |
| 3 | D2 | 00 x 500 x 15 |
| 4 | D3 | 500 x 350 x 15 |
The working edge (ebony) must be straight.
Now-a-days the drawing boards are available with laminated surfaces. The flatness can be checked by placing a straight edge on its surface. If no light passes between them, the surface is perfectly flat.
Engineering Drawing
- Instruments
- Log in to post comments
