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  PROJECTION OF PLANES Dr. Saleel Ismail & Dr. Ghulam Jilani Mechanical Engineering ZZ1002D  –  ENGINEERING GRAPHICS  Projection of Planes ã Plane figures/surfaces have only two dimensions  –  length and breadth, ã e.g. triangle, rectangle, square, pentagon, hexagon, circle …   ã Thickness is zero ã Types of Planes (based on position): ã Perpendicular planes  – Perpendicular to both reference planes (i.e. lying on a profile plane)  – Perpendicular to one plane and parallel to the other  – Perpendicular to one plane and inclined to the other (on AVP or AIP) ã Oblique planes  – Inclined to both reference planes ZZ1002D - Engineering Graphics  Perpendicular to Both HP and VP ã Draw the projections of a square of side 50 mm that is perpendicular to both HP and VP. ã Assume suitable distances from the reference planes ã Mark the HT and VT ã Solution starting with side view ZZ1002D - Engineering Graphics If a plane is perpendicular to a principal plane the projection on that plane will be a line    Perpendicular to HP, Parallel to VP ã ABC is an isosceles triangle, base AB = 30 mm and AC = BC = 60 mm. AB is parallel to the HP and the triangle is perpendicular to HP and parallel to VP ã Draw the projections of the triangle and indicate the trace(s) ZZ1002D - Engineering Graphics If a plane is parallel to a principal plane, the projection on that plane will give true shape  
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