Engineering Drawing 3rd Angle Projection
There are two ways of drawing in orthographic first angle and third angle. Since world war 2 where the uk sent engineering drawing to the us for manufacture the uk has adopted 3rd angle projection as the general standard.
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But circa the 1890s third angle projection spread throughout the north american engineering and manufacturing communities to the point of becoming a widely followed convention and it was an asa standard by the 1950s.. Enjoy the and music you love upload original content and share it all with friends family and the world on youtube. Until the late 19th century first angle projection was the norm in north america as well as europe. Orthographic drawings are useful especially when a design has been developed to a stage whereby it is almost ready to manufacture.
Engineering drawing is the language of engineers. Third angle projection is primarily used in the united states and canada where it is the default projection system according to asme standard asme y14 3 2003 and british standard bs 8888 when the 3d object is projected into 2d paper after projected front view the top view is placed on the top and the left view is placed on the left. View b from the left is placed on the left view c from the right is placed on the right view d from above is placed above view e from below is placed underneath.
Having a good communication skill is one important qualities for a successful career. They are used to obtain engineering drawings for clarity. In the third angle projection object is placed in the third quadrant and the projection plane lies in between observer and the object.
Both first angle and third angle projection are the two ways of drawing in orthographic that usually consists of three different views of an object in two dimensions. 4 4 views are now positioned as follows. Summary of first vs third angle projection.
The difference between first and third angle projection is in the arrangement of views and with reference to the illustration in fig. If you want yourself to be a successful engineer sound knowledge in engineering drawing is a must. 3rd angle projection is a type of orthogonal projection system used to create 2d drawings.
If one regards the artesian coordinates as being made of quadrants then 1st angle and 3rd angle are two different quadrants in which an object is places and different planes on to which the drawing is projected. The third angle projection or first angle projection different countries and regions typically use one method or the other although this can depend on a company s customer. First angle projection and third angle projection.
It is widely used in united state and asian countries. Below is an example of 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.
They differ only in the position of the plan front and side views. But circa the 1890s third angle projection spread throughout the north american engineering and manufacturing communities to the point of becoming a widely followed convention and it was an asa standard by the 1950s.
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