An Alternative method

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.

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. The US, Canada, Japan and Australia are the only other regions that typically use 3rd Angle projection as standard.

3rd Angle project is where the 3D object is seen to be in the 3rd quadrant. It is positioned below and behind the viewing planes, the planes are transparent, and each view is pulled onto the plane closest to it. The front plane of projection is seen to be between the observer and the object.

The images below show the projection of the object on a 3D box surrounding the object. The box is then gradually unfolded to then present a series of 2D views in the 3rd Angle projection as viewed by the observer.

 

The following demo shows this in motion:

The views below show the same object in first an Isometric 3D view then the corresponding 2D 3rd Angle projection views in the specific alignment. The annotations on the 2D views show how the Top and Left views are aligned to the front view.

  • The front view, is a drawing of the block, as if you are looking directly at the front of the object.
  • The side view, is a drawing of the block, when it has been rotated so that one of its sides is now directly in view.
  • The plan view, is a ‘birds eye’ view, from above.

The 3rd Angle projection symbol shows the orientation of a cone in the 3rd Angle projection.

 

Expand Your GD&T Knowledge

Geometric Dimensioning & Tolerancing allows you to fully communicate the functional requirements of your design, advising the manufacturer of the maximum amount of allowable deviation while still producing a viable component.

Try Our Virtual Training Courses
Previous
How Important is Mesh Density in Abaqus CEL Studies?
Next
CATIA Losing File Association
At TECHNIA, we pave the way for your innovation, creativity and profitability.

We combine industry-leading Product Lifecycle Management tools with specialist knowledge, so you can enjoy the journey from product concept to implementation. Our experience makes it possible to keep things simple, personal and accessible so that together we transform your vision into value.

Want to receive more content like this?
  • Related news and articles straight to your inbox
  • Hints, tips & how-tos
  • Thought leadership articles
How-to’s, hints & tips

Learn how to work better together with world-leading PLM knowledge that keeps your engineering design, simulation and manufacturing ahead of the curve.