Drawings, 1st Angle or 3rd Angle?

[routercnc]

When I was tought technical drawing way back in uni days it was all 3rd angle projection drawn in pencil on a proper drawing board with fancy rulers that moved along parallel lines. All had to conform to British Standards for layout and content. There is a symbol for 1st and 3rd angle which is a truncated cone on its side and end so you can see how the part is rotated when switching views.

Nowadays the CAD creates the 3 views automatically from a solid model but I still try and keep to the main standards for dimensioning and highlighting parts of the drawing. I also tend to include an isometric view in the corner as this is so easy with CAD and can add to the clarity and avoid annoying mistakes when machining!

But if it is a part that I've drawn on a piece of paper for me to quickly make then it's just whatever works to get the thing made.

[routerdriver]

The last post tells the truth about modern practice.The days of using a board and pencil or even using a computer as a 2D drawing system have faded away.A 3D model will help you avoid spatial clashes and can be viewed from any angle and with layers turned off or objects hidden for clarity you will have no trouble visualising the article.Best of all you can now find 3D CAD systems for little or no cost and why wouldn't you?Should you need a 2D drawing for any purpose a couple of mouse clicks will get you there.

[russell]

I've always preferred third angle as that's what I was taught at university in the 60s.

Does anyone know what happened to second angle?

Russell

[magicniner]

Does anyone know what happened to second angle?

That's when you show the same thing in all three drawings, but flipped 180 so from the back in two views, not very useful!
Not uncommon for Millennials :D

[Ger21]

Best of all you can now find 3D CAD systems for little or no cost and why wouldn't you?

Because 2D drawings and 2.5D CAM can be far faster, if you know what you are doing. 99% of what I do on my router are done with 2D CAD, where I can draw and create toolpaths faster than just creating a 3D model.

[johnsattuk]

Because 2D drawings and 2.5D CAM can be far faster, if you know what you are doing. 99% of what I do on my router are done with 2D CAD, where I can draw and create toolpaths faster than just creating a 3D model.