missing and isometric views ppt

MISSING AND ISOMETRIC VIEWS PRESENTATION BY

Mr.KIRAN LALSANGI

Discussion on Orthographic and isometric projection.

Principal of projection. If straight lines are drawn from various points

on the counter of an object to meet a plane, the object is said to be projected on that plane. The figure formed by joining ,in correct sequence ,the points at which these lines meet the plane ,is called the projection of the object .The lines from the object to the plane are called projectors.

METHODS OF PROJECTION In engg. drawing following four methods

of projections are commonly used they are

1)Orthographic projection.

2)Isometric projections.

3)Obique projection.

4)Prespective projection.

In the above methods 2,3,4 represents the objects by a pictorial view as eyes see it .In these methods of projection a three dimensional object is represented on a projection plane by one view only. While in the orthographic projection an object is represented by two or three views on the mutual perpendicular projection planes. Each projection view represents two dimensions of object at least two or three views are required.

Draw the first angle projection and third angle projection symbol?

Why first angle and third angle method is used and why second and fourth angle method is not used?

Assumptions.1)Vertical plane is assumed fix.

2)Horizantal plane is rotated in 90 degree.

3)Horizontal plane is rotated in clockwise direction only.

4)Observer is always at the right side of vertical plane.

Why third angle method is mostly used?

First angle projection

Third angle method.

What is mean by isometric projection?

Isometric projection is a type of pictorial projection in which the three dimensions of a solid are not only shown in one view, but their actual sizes can be measured directly from it.

Isometric graph

Answer

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12.Draw isometric view?.

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29.Draw top view & isometric view

29. Solution

30. Draw top view and isometric view.

30.Solution

31.Draw L.H.S.V. and Isometric view

31.Solution.

32.Draw isometric view?

32.Solution

33.Draw isometric view?

33-Solution

34.Draw isometric view?

35.Draw isometric view?

Evaluate yourself . No of correct answers –

60 or more – Excellent Between 40 –60 – Good Between 30 – 40 – Average Less than 30 – Take efforts