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In a first angle projection, the object stands in between the observer and the plane of projection. In a third angle project, the object and the plane of projection is interchanged.
Firstly Draw a pentagon and enclose it in a square. Then draw an isometric scale. With isometric reading draw the square first on 120degree axis, reduce the pentagon sides on isometric scale and plot it on the isometric square
Basically its just where you position the views of the main object, in first angle projection, if you view the object from the left, the view is drawn to the right of the object, in third angle projection, its drawn on the viewing side.
In first-angle projection, the projectors originate as if radiated from a viewer's eyeballs and shoot through the 3D object to project a 2D image onto the plane behind it. The 3D object is projected into 2D "paper" space as if you were looking at a radiograph of the object: the top view is under the front view, the right view is at the left of the front view. First-angle projection is the ISO standard and is primarily used in Europe.
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v Orthographic drawingØOrthographic drawings are orthographic projection drawings. These can be drawn at first angle projection and third angle projections.ØI am going to explain orthographic third angle projection drawing because I use them.ØIf I want to draw orthographic third angles projection drawing I have to follow some rules.ØThese rules are:ØThe view from the front is in the middle.ØThe view from the left is on the left.ØThe view from the right is on the right.ØThe view from the top is on the top.ØThe view from the bottom is on the bottom.ØThe view from the rear/back is on the far right.Example of orthographic third angle projection.Orthographic drawing advantageOrthographic drawing disadvantageEasy to recognized /read and understand by engineers.Hard to recognized by other people then engineers.Doesn't looks like at all to real design/picture.
Both third angle and first angle projection display the standard three orthographic views of a part or assembly on a drawing.. The key difference between third angle and first angle is the layout of the part on the sheet.
first angle projection and third angle projection.
In a first angle projection, the object stands in between the observer and the plane of projection. In a third angle project, the object and the plane of projection is interchanged.
Neglecting term "opposite".. In third angle projection, what we see are what are we going to draw
Firstly Draw a pentagon and enclose it in a square. Then draw an isometric scale. With isometric reading draw the square first on 120degree axis, reduce the pentagon sides on isometric scale and plot it on the isometric square
first angle, third angle
right side view draw in left side and left side view draw in right side is called third angle projection
any country using in second r fourth angle projection r else what r the advantages between first angle and third angle projetion
A cone shown in a circle
they are fools