CAD ENGINEERING CONCEPTS

What are the Drawing instruments and How to use them

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Drawing instruments are essential part of engineering drawings and Every draft men and engineer should know about the following drawing instruments.

Drawing instruments are.

  1. Drawing Board
  2. Drawing Sheets
  3. Instrument Box
  4. Mini – Drafter
  5. Set squares (30° Triangle and 45° – 60° triangle)
  6. Scales
  7. Protractor
  8. Drawing Pencils (H , 2H and HB Grades)
  9. Eraser and Sharpener
  10. Adhesive tape and Clips.

Drawing Board 

Drawing boards are very supportive and easy to adjusting the drawing boards at the required places. Drawing boards are made by the softwood with 25 mm thickness.

Drawing Sheets

The Drawing sheets should be Tough and Strong. Standard drawing sheet sizes are.

Instrument Box

Drawing Instruments

In the instrument box contains the following instruments.

  1. Compasses
  2. Dividers
  3. Inking pen

Compasses.

  • Compasses are mainly used to draw circles. Compasses are two types they are Large Compasses, Bow Compasses.
  • Large compasses are used to draw circles up to Ø100 mm.
  • The bow compasses used for the small circles up to Ø25 mm Diameter.