They are often used to show how to put together flat-pack furniture or model kits. Similar to exploded views, an assembly drawing will show how the parts of a product fit together and where components should go. In a third angle projection the plan view is above the side view.įirst and third angle projections use these symbols on a diagram to indicate which projection they are: Assembly drawings In a first angle projection the plan view is below the side view. The views in first angle are depicted as if you were looking at an x-ray of the object. In first angle, the view from the right would be projected through and drawn on the left. In third angle, what you see from the right would be drawn on the right. These lines allow complex shapes to be drawn simply in 2D. Orthographic projections have a set of standard lines to show different aspects of the diagram. The difference between first and third angle projection is in the position of the plan, front and side views. First and third angle projectionsįirst angle projections and third angle projections are the two types of orthographic drawing, also referred to as ‘working drawings’. These drawings are to scale and must show dimensions. Starting with a front view of a product, construction lines show where areas join and are used to draw a side and plan (top) view, ensuring that the drawing is accurate from all angles. They are used to show an object from every angle to help manufacturers plan production. Orthographic projections are working drawings in either a first or third angle projection and show each side of a design without perspective, ie a 2D drawing of a 3D object. 2D and 3D drawing techniques Orthographic projections
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