This course is designed for the brief description about Concept of conventions,Plane curves,Projection of points,Lines and plane surface,Projection of Solids and Orthographic projections.
Introduction to Engineering drawing - Introduction to Engineering drawing. Drawing instruments - Drawing instruments. Lettering – Introduction, Styles of lettering, Double stroke vertical lettering. Lines – Lines, Types of lines, Types of lines and its application, Line weights, Drawing sheet, Folding of drawing sheet, Material conventions. Dimensioning practice – Dimensioning, Elements of dimensioning, Surface finish, Indication of surface texture, Placing of dimensioning, Arrangements of dimensions, Rules for dimensioning standard features, Example. Scales – Introduction, Nature of scales, Representation of scale, Scales on drawings. Plain scale - Plain scales, Example. Diagonal scale - Diagonal scales, Example. Vernier Scale - Vernier scales, Example.
Geometrical constructions - To bisect a line, To bisect an arc, To divide a line into eight equal number of parts, To Bisect an angle, To Trisect an angle, Example, Construction of tangent lines, Example, To construct a square, To construct an equilateral triangle, To construct a regular hexagon, To construct any regular polygon. Conics – Conics, Construction of ellipse by eccentricity method (Directrix and Focus method), Construction of ellipse by arcs of circle method, Construction of ellipse by concentric circle method. Parabola - Construction of parabola by eccentricity method, Construction of parabola by rectangular method. Hyperbola - Construction of hyperbola by eccentricity method, Construction of rectangular hyperbola. Cycloid – Cycloid, Epicycloids, Hypocycloids. Involutes – Involute, Construction of involute of square, Helix on cone, Helix on cylinder, Spiral.
Projection – Projection, Orthographic projection, Planes of projection, Four quadrant, Six faces on the box, First angle projection, Third angle projection, Symbols for methods of projection, II and IV angle projections. Example Problem – Example. Free hand sketching - Free hand sketching, Problem.
Projection of points – Projection of points, Example. Projection of Lines - Projection of straight lines, Different positions of a straight line with respect to V.P and H.P, Example, Line inclined to both the reference planes, Example, Common data for all problems, Example, True length and true inclinations of a line, Rotating line method, Example, Rotating trapezoidal method, Example, Trace of a line, Example. Projection of plane surface - Projection of planes, Different positions of the plane with respect to HP and VP, Traces of plane, Example.
Projection of solids – Introduction, Polyhedra, Other polyhedral, Solids of revolution, Cylinder, Cone, Sphere, Frustums, Truncated solids, Right regular solids and oblique solids. Positions of the solid - Solid with axis perpendicular to HP, Example. Solid with axis perpendicular to VP - Solid with axis perpendicular to VP, Example. Solid with axis parallel to both HP and VP - Solid with axis parallel to both HP and VP, Example. Solid with axis parallel to VP and inclined to HP - Solid with axis parallel to VP and inclined to HP, Example. Solid with axis parallel to HP and inclined to VP - Solid with axis parallel to HP and inclined to VP, Example.