topic Re: Angle in Isometric View in AutoCAD Forum

Angle in Isometric View

Anonymous — Sat, 04 May 2019 15:54:59 GMT

Hello, I am new in AutoCAD. I am trying to make a angle in isometric view. I have a 2D front view and trying to make its isometric view. The front view is added here (File name: Angle.png). I have tried it several time to make the proper angle. But, it is vain.

Can anyone please tell me how can I create this angle?

Re: Angle in Isometric View

GrantsPirate — Sat, 04 May 2019 19:13:01 GMT

Locate the endpoints and connect those with a line

Re: Angle in Isometric View

Anonymous — Sat, 04 May 2019 19:47:51 GMT

Sir, Thank you for your reply. But how can I find those end points? 😞

Re: Angle in Isometric View

leeminardi — Sat, 04 May 2019 20:20:16 GMT

A 60° line has a horizontal displacement of 1 and a vertical displacement of sqrt(3) = 1.732...

Therefore, from point A go 1 unit in a direction of -30° and then vertically up 1.732. Connect these two points to get the isometric projection of a line at 60°. For point B go 1 in the 150° direction (up and to the left) and then 1.732 vertically up.

When drawing lines that are not parallel to a principal axis you will need to determine the angle by using the horizontal and vertical components of its slope and not the angle

Re: Angle in Isometric View

Anonymous — Sat, 04 May 2019 21:21:24 GMT

Sir, I am doing this. 😞

Re: Angle in Isometric View

leeminardi — Sat, 04 May 2019 23:28:07 GMT

And what you are doing is wrong! YOu are creating a line at 60° up and to the right which is not the angle for an isometric view. The second line you create is at 30° up and to the left. Again wrong. It doesn't sound like you took the suggestion I presented in my last post. You cannot use true angles in an isometric.

Try the following, create an isometric drawing of a perfect cube and draw lines between opposite corners as shown below. The red and green lines are at an angle of 45° on THE REAL OBJECT but are not at 45° in the projection. The red and green lines are the same length on the real object but not in the isometric drawing.

Re: Angle in Isometric View

SEANT61 — Sun, 05 May 2019 01:21:13 GMT

Another way to process the isometric angles is via construction geometry. I arbitrarily chose some dimensions not provided, but the general idea is still valid.

Re: Angle in Isometric View

Anonymous — Sun, 05 May 2019 14:45:45 GMT

Sir, I have done this!

Re: Angle in Isometric View

SEANT61 — Sun, 05 May 2019 15:03:11 GMT

@Anonymous wrote:

Sir, I have done this!

And you did well. Those are the angles that should result.

Re: Angle in Isometric View

Anonymous — Sun, 05 May 2019 15:08:36 GMT

@SEANT61 sir, I want to show 60 degree in isometric view!

Re: Angle in Isometric View

SEANT61 — Sun, 05 May 2019 15:14:42 GMT

@Anonymous wrote:

@SEANT61 sir, I want to show 60 degree in isometric view!

No, you don't. An angle of 60 degrees in an orthographic projection will not be 60 degrees in an isometric projection.

Re: Angle in Isometric View

Anonymous — Sun, 05 May 2019 15:27:17 GMT

@GrantsPirate , @leeminardi , @SEANT61 , Thank you sir. 🙂

Re: Angle in Isometric View

j.palmeL29YX — Sun, 05 May 2019 16:32:44 GMT

@Anonymous wrote:

Sir, I have done this!

I'd prefer to use the solution shown by @SEANT61 in post No. 7 and would suggest you to do so too. This is an exact construction. You use a rounded numerical value. Maybe this lack of precision is akzeptable for you at the moment, but this inaccuracy can cause problems in the future.