Engineering Drawing 1st Angle Projection
Select a simple three dimensional object and draw it in first angle projection.
Engineering drawing 1st angle projection. An engineering drawing a type of technical drawing. Engineering drawings could be readily doubled or halved in size and put on the next larger or respectively smaller size of paper with no waste of space. Advertisement every engineer must know how to read engineering drawings and the most integral part of this is knowing the difference between first and third angle projection. In the first angle projection system the object placed in the first quadrant and in third angle projection system the object placed in the third quadrant.
First angle projection was widely used in the uk but during world war ii british drawings sent to be manufactured in the usa such as of the rolls royce merlin had to be drawn in third angle projection before they could be produced eg as the packard v 1650 merlin. Clear the confusion 1st angle and 3rd angle projection हनद duration. First of all we know that the first angle projection system and third angle projection system both are the methods used for orthographic projection drawing. In first angle projection.
First angle projection is commonly used in all countries other than united states. The original question was why is first angle method preferred over third angle i think in the long run it all comes down to local custom and tradition. That said there is one basis for a good selection that might tilt in favor of one or the other. This historical position of the uk means that some british companies.
Notice how the symbol for first angle orthographic projection has been added and the paper has a title block and borderline. Third angle projection is commonly used in united states of america. There are two different types of projection methods in engineering drawings namely first angled projection and third angled projection. The difference between first angle and third angle projection is the way that a 3d object is rotated on a drawing to show the different sides and views.
Both convery the same information so neither it truly superior to the other. The second in the series of videos on engineering drawing concepts and conventions. The final arrangement of the views are shown in the drawing below. The indian standard institution isi recommend the use of first angle projection method now in all the institutions.
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