drawing instruments

Topics: Technical drawing, Pencil, Angle Pages: 4 (712 words) Published: September 24, 2013


Compilation on Drawing 1

Name: John Carlo T. Gasic
Course/Year/Section: BSCE 1G
Instructor: Rosell A. Manzano
Date: September 06, 2013

Drawing Instruments and Uses
Drawing Instruments are used to prepare neat and accurate Drawings. To a greater extent, the accuracy of the Drawings depend on the quality of instruments used to prepare them. Drawing Board:
Drawing board is made from strips of well seasoned soft wood generally 25 mm thick. It is cleated at the back by two battens to prevent warping. One of the shorter edges of the rectangular board is provided with perfectly straight ebony edge which is used as working edge on which the T-square is moved while making Drawings. It is a kind of multipurpose desk, which can be used for any kind of drawing, writing or impromptu sketching on a large sheet of paper or for reading a large format book.

Set square:

A thin flat piece of plastic, metal, etc., in the shape of a right-angled triangle, used in technical drawing. Set squares are generally made from Plastic or celluloid material. They are triangular in shape with one corner, a right angle triangle. A pair of set squares (30°–60°) and 45°(45°) set square are generally provided with Protractor) facilitate marking of angles.

T-square:
A T-shaped ruler used in mechanical drawing, consisting of a short crosspiece, which slides along the edge of the drawing board, and a long horizontal piece: used for drawing horizontal lines and to support set squares when drawing vertical and inclined lines

Pencils:

Pencils are rated on a scale of numbers and letters that describes the hardness of the graphite. Both hard and soft pencils have their uses in drawings. “H” Pencils:-
“H” is the letter assigned to the hard graphite. A hard pencil produces a fine, light line. The hard pencils erase easily as long as you press lightly. If you press hard enough to indent the...
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