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# Unit 6 orthographic projections

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### Unit 6 orthographic projections

1. 1. ORTHOGRAPHIC PROJECTIONS :IT IS A TECHNICAL DRAWING IN WHICH DIFFERENT VIEWS OF AN OBJECT ARE PROJECTED ON DIFFERENT REFERENCE PLANES OBSERVING PERPENDICULAR TO RESPECTIVE REFERENCE PLANE Different Reference planes are Horizontal Plane (HP), Vertical Frontal Plane ( VP ) Side Or Profile Plane ( PP) And Different Views are Front View (FV), Top View (TV) and Side View (SV) FV is a view projected on VP. TV is a view projected on HP. SV is a view projected on PP. IMPORTANT TERMS OF ORTHOGRAPHIC PROJECTIONS: 1 Planes. 2 Pattern of planes & Pattern of views 3 Methods of drawing Orthographic Projections
2. 2. PATTERN OF PLANES & VIEWS (First Angle Method) 2 THIS IS A PICTORIAL SET-UP OF ALL THREE PLANES. ARROW DIRECTION IS A NORMAL WAY OF OBSERVING THE OBJECT. BUT IN THIS DIRECTION ONLY VP AND A VIEW ON IT (FV) CAN BE SEEN. THE OTHER PLANES AND VIEWS ON THOSE CAN NOT BE SEEN. Y PROCEDURE TO SOLVE ABOVE PROBLEM:- TO MAKE THOSE PLANES ALSO VISIBLE FROM THE ARROW DIRECTION, A) HP IS ROTATED 900 DOUNWARDX B) PP, 900 IN RIGHT SIDE DIRECTION. THIS WAY BOTH PLANES ARE BROUGHT IN THE SAME PLANE CONTAINING VP. Click to view Animation On clicking the button if a warning comes please click YES to continue, this program is safe for your pc. VP PP Y FV LSV X Y X TV HP ACTUAL PATTERN OF PLANES & VIEWS HP IS ROTATED DOWNWARD 900 PP IS ROTATED IN RIGHT SIDE 90 0 OF ORTHOGRAPHIC PROJECTIONS AND AND DRAWN IN BROUGHT IN THE PLANE OF VP. BROUGHT IN THE PLANE OF VP. FIRST ANGLE METHOD OF PROJECTIONS
3. 3. ORTHOGRAPHIC PROJECTIONS OF POINTS, LINES, PLANES, AND SOLIDS.TO DRAW PROJECTIONS OF ANY OBJECT,ONE MUST HAVE FOLLOWING INFORMATIONA) OBJECT { WITH IT’S DESCRIPTION, WELL DEFINED.}B) OBSERVER { ALWAYS OBSERVING PERPENDICULAR TO RESP. REF.PLANE}.C) LOCATION OF OBJECT, { MEANS IT’S POSITION WITH REFFERENCE TO H.P. & V.P.} TERMS ‘ABOVE’ & ‘BELOW’ WITH RESPECTIVE TO H.P. AND TERMS ‘INFRONT’ & ‘BEHIND’ WITH RESPECTIVE TO V.P FORM 4 QUADRANTS. OBJECTS CAN BE PLACED IN ANY ONE OF THESE 4 QUADRANTS. IT IS INTERESTING TO LEARN THE EFFECT ON THE POSITIONS OF VIEWS ( FV, TV ) OF THE OBJECT WITH RESP. TO X-Y LINE, WHEN PLACED IN DIFFERENT QUADRANTS. STUDY ILLUSTRATIONS GIVEN ON HEXT PAGES AND NOTE THE RESULTS.TO MAKE IT EASY HERE A POINT A IS TAKEN AS AN OBJECT. BECAUSE IT’S ALL VIEWS ARE JUST POINTS.
4. 4. STUDY ZILLUSTRATIONS F.V. & T.V. and S.V.of an object are given. Draw it’s isometric view. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW 20 20 20 x y O 50 20 30 O 20 20 20 TOP VIEW
5. 5. STUDY ZILLUSTRATIONS F.V. and S.V.of an object are given. Draw it’s isometric view. 30 SQUARE 40 20 50 20 10 O 30 60 F.V. S.V. O
6. 6. STUDY ZILLUSTRATIONS F.V. & T.V. of an object are given. Draw it’s isometric view. FV 40 10 O 30 D 45 10 50 O 80 TV
7. 7. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view. ZILLUSTRATIONS FV 40 X O 10 Y 100 10 25 TV 10 30 10 25 30 R O 20 D
8. 8. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view. ZILLUSTRATIONS 30 FV RECT. SLOT 10 50 35 10 X Y O 20 D TV 60 D 30 D O
9. 9. STUDY ZILLUSTRATIONS F.V. and S.V.of an object are given. Draw it’s isometric view. 10 25 15 25 40 10 25 25 O O 80 25 F.V. S.V.
10. 10. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view. ZILLUSTRATIONS 450 30 FV 40 X Y O 30 D 40 TV 15 40 O
11. 11. STUDY ZILLUSTRATIONS F.V. and S.V.of an object are given. Draw it’s isometric view. HEX PART 30 20 20 40 20 O 50 20 15 O 30 100 60
12. 12. STUDY F.V. & T.V. of an object are given. Draw it’s isometric view. ZILLUSTRATIONS 20 40 F.V. 30 10 X Y O 10 30 10 30 O 80 T.V.
13. 13. F.V. and S.V.of an object are given. Draw it’s isometric view. STUDY 10 10 15 Z ILLUSTRATIONS 25 25X Y O 50 10 FV LSVNOTE THE SMALL CHZNGE IN 2ND FV & SV. DRAW ISOMETRIC ACCORDINGLY. 10 X Y O FV LSV
14. 14. STUDY ZILLUSTRATIONS F.V. and S.V.of an object are given. Draw it’s isometric view. 30 20 10 20 15 10 15 O 15 30 15 X O Y 50 F.V. LEFT S.V.
15. 15. STUDY ZILLUSTRATIONS F.V. and S.V.of an object are given. Draw it’s isometric view. 30 10 60 30 O O 40 40 F.V. S.V.