Technical Drawing Made Easy

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  • Topic: Polygon, Engineering drawing, Triangle
  • Pages : 14 (3717 words )
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  • Published : March 22, 2012
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TECHNICAL DRAWING APPLICATIONS (65)
(Candidates offering Technical Drawing are not eligible to offer Technical Drawing Applications.) Aims: 1. To develop competence among the students to pursue technical courses like Engineering, Architecture, Draftsmanship Surveying and other professional courses. 2. To understand basic principles of instrumental drawing drawn to scale and to acquire basic skills in the use of traditional drafting methods which would also be helpful in understanding computer aided designs. 3. To acquire the basic knowledge in their applications in various fields.

CLASS IX
There will be one written paper of three hours duration carrying 100 marks and Internal Assessment of 100 marks. The paper will be divided into two sections, Section I and Section II. Section I (40 marks) shall consist of compulsory short answer questions chosen from the entire syllabus. Section II (60 marks) shall contain questions which require longer answers. There will be a choice of questions. THEORY – 100 Marks 1. Types of lines (i) Border lines. (ii) Outlines. (iii) Dashed/ Dotted lines. (iv) Centre lines. (v) Extension lines or Projection lines. (vi) Dimension lines. (vii) Construction lines. (viii) Cutting-Plane lines. (ix) Section or Hatching lines. (x) Short break lines. (xi) Long break lines. 3. Lettering and Numbering

Upright capitals and small, freehand, single stroke, as used in Engineering drawing, and between, the correct guide lines. 4. Sheet Layout Basic – draw border lines, title block with name, sheet number, title etc. 5. Geometrical Constructions (a) Bisector of line segment. (b) Division of a line segment into required number of parts/ proportional parts. (c) Perpendicular and parallel lines. (d) Bisection of an angle, trisection of a right angle/ straight angle. (e) Congruent angle. (f) To find the centre of an arc. (g) Regular polygons up to six sides with simple methods using T-square and setsquares.

Point, Lines and Angles: Definitions of the various terms used in relation to, a point, different types of lines and different types of angles to be used only in construction. • • Bisecting a line. Drawing a perpendicular to a line from a point, in/above / away from the end of, the line. Bisecting an angle when the lines meet. Trisecting a right angle. Making an angle equal to a given angle.

The names of different lines and their uses to be matched with the correct thickness and shade. 2. Dimensioning (i) Aligned system. 227 (ii) Unidirectional System.

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Draw parallel line to a given line touching given point away from the line by using correct instruments such as set squares/compasses. Draw parallel line to a given line at a given distance. Locating a point equally distant from two points, away from the line Dividing a straight line into any required number of given parts. Draw two lines, from two points outside a given straight line, to meet at a point in the line, making equal angles with it. Constructing angles of 90, 45, 22½, 135, 67½, 60, 120, 30, 52½, 105, 75, 37½. degrees.

Construction of Right angled when the following is given: • • • the hypotenuse and the base.

triangles

• • • •

the hypotenuse and an acute angle. The base and height.

Quadrilaterals:Definitions of a quadrilateral / different kinds of quadrilaterals, e.g. a square, a rectangle, a rhombus and a trapezium to be used only in the construction of • • • • a rectangle: when the diagonal and one side is given or two sides are given. a square: when one side or the diagonal is given. a rhombus: when one side and one angle is given/when two diagonals are given. a trapezium: when the diagonal and the equal sides are given/when two parallel sides and distance between them is given.



Triangles: Definition of a triangle, the terms (with their definitions) relating to the different parts of a triangle, classifying the different kinds of triangles, according to their sides / angles. Construction of...
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