Orthographic projection
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The document discusses orthographic projections and sectional orthographic projections. It explains that orthographic projections create 2D representations of 3D objects by projecting lines from edges orthogonal to the projection plane. There are two types of projections: first angle and third angle. The difference between them is the positioning of top, bottom, and side views. Sectional views indicate hollow and solid areas using hatching lines at 45 degrees spaced 0.25 mm apart. The document provides examples of orthographic and sectional orthographic projections of various machine parts.
Orthographic projection
- 1. Topic : Guided By : Branch : Batch :
- 2. Name ENROLLMENT NO. Abhishek Chokshi 140120109005 Himal Desai Harsh Dedakia 140120109008 140120109012
- 4. Basically, orthographic projection means a 2-dimensional representation of and 3-dimensional solid object. The object is represented by projecting lines from its edges such that the lines are orthogonal to the projection plane.
- 5. Basically, there are 2 types of orthographic projection. They are: 1) 1st angle projection And 2)3rd angle projection They are explained below.
- 6. PROJECTION SYSTEMS 1. First angle system 2. Third angle system First Quadrant Third Quadrant
- 7. The one and only difference between 1st angle & 3rd angle projection is that only the representation positions of plan (top view), bottom view and side view. In 1st angle projection, the front view is in center, top view is below front view, bottom view is above front view, RHSV(right hand side view) is to the left of front view and LHSV(left hand side view) is to the right of front view.
- 8. ORTHOGRAPHIC PROJECTION 1st angle system 3rd angle system
- 9. ORTHOGRAPHIC VIEWS 1st angle system 3rd angle system Folding line Folding line Folding line Folding line
- 10. ORTHOGRAPHIC VIEWS 1st angle system 3rd angle system Front View Front View Right Side View Right Side View Top View Top View
- 11. First angle system Third angle system PROJECTION SYMBOLS
- 12. SYMBOLS USED ON ENGINEERING DRAWING SHEET FIRST ANGLE METHOD OF ORTHOGRAPHIC PROJECTIONS THIRD ANGLE METHOD OF ORTHOGRAPHIC PROJECTIONS M/c. PARTS ARE NEVER ASSUMED IN SECOND OR IN FOURTH QUADRANT, AS THE VIEWS MAY OVERLAP ON ONE ANOTHER ABOVE XY OR BELOW XY RESPECTIVELY.
- 13. Step by step procedure Suggested to prepare Orthographic views (First angle method) for The simple component Shown pictorially in figure
- 14. 30 10 25 SQ 15 SQ Ø30,Depth 10 40 SQ ISOMETRIC ORTHO. VIEWS
- 15. 25 Sq 4015 453535 15 Sq 40 Sq Ø30 5 10 30 10 5 10 R.H. S.V. F.V. T.V.
- 16. Figure shows the isometric view of a vertical shaft support. Draw its all the three views, using first angle method of projections. Give the necessary dimensions as per aligned system. Exercise :-
- 20. Sectional view is used to indicate that when the solid is cut from a particular plane, where there is mass and where it is hollow. Straight lines at 45 degree angle are drawn at distance of 0.25 mm to indicate the mass and the part that is hollow is kept plain Also, in sectional view, no hidden lines are to be indicated.
- 21. Aim:-Sketch-1, shows Isometric View of a machine part. Draw its following orthographic views using third angle method of projections, giving dimensions. (1) Sectional F.V.-AA (2) T.V. (3) L.H.S.V A A 8 Φ20Φ36 A A LEFT HAND SIDE VIEW SECTIONAL FRONT VIEW AA TOP VIEW X SCALE:- 1:1 SYMBOL OF PROJECTION METHOD, NOT SHOWN Sketch-1 2 HOLES,Φ 14 Φ36 Φ20 R35 65 14` 100 AA SOLUTION` 30
- 22. A A LEFT HAND SIDE VIEW SECTIONAL FRONT VIEW AA TOP VIEW SCALE:- 1:1 SYMBOL OF PROJECTION METHOD, NOT SHOWN SOLUTION` AA 100 8 Φ20Φ36 2 HOLES,Φ 14 X Φ36 Φ20 R35 A A Aim:-Sketch-1, shows Isometric View of a machine part. Draw its following orthographic views using third angle method of projections, giving dimensions. (1) Sectional F.V.-AA (2) T.V. (3) L.H.S.V 14 30 Hatch (section) lines, to be kept at 1 to 1.5 mm apart, at 45° normally, but depends on areas to be hatched.