topic Re: How to make angle dimension in isometric in AutoCAD Forum

How to make angle dimension in isometric

Anonymous — Sun, 25 Nov 2018 01:32:24 GMT

How do you make angle dimension in isometric?

Re: How to make angle dimension in isometric

j.palmeL29YX — Sun, 25 Nov 2018 12:44:34 GMT

Please post an example (dwg), what you want to do.

cadder

Re: How to make angle dimension in isometric

leeminardi — Sun, 25 Nov 2018 15:00:44 GMT

Are you asking:

How to add an angle dimension line in a 2D isometric drawing?
How to add an angle dimension line in an isometric view of a 3D model?
How to draw a line at a specific angle in an 2D isometric drawing?
Something else?

Please clarify.

Re: How to make angle dimension in isometric

neaton — Sun, 25 Nov 2018 16:52:46 GMT

Edwin Prakoso has a CADNotes article on creating dimstyles for Isometric Dimensions >>here<<. Is this what you are looking for? If you are looking for examples do a Google image search for "Isometric dimension".

Nancy

Re: How to make angle dimension in isometric

Anonymous — Mon, 26 Nov 2018 00:58:17 GMT

The real object shown in first picture has a angle of 45°, and I know that my drawing is correct because I used the triangle and trigonometry to calculate the length. But when I'm trying to create the angular dimension about that angle, the dimension shown is 30° instead of 45°. How to fix this? I tried to change the text of that angle, but it doesn't work.

Re: How to make angle dimension in isometric

Anonymous — Mon, 26 Nov 2018 01:00:48 GMT

Re: How to make angle dimension in isometric

Anonymous — Mon, 26 Nov 2018 01:02:57 GMT

Re: How to make angle dimension in isometric

leeminardi — Mon, 26 Nov 2018 02:28:09 GMT

@Anonymous

From your posts it is not clear whether or not you realize that you are creating a 2D isometric drawing and not a 3D model. I come to this conclusion because:

You did not respond to my post (#3).
In your post #5 you mention using trig and there is no need to use trig to create this drawing in 2D or 3D.
You are puzzled by why the angle you get is 30°. Principal lines in an isometric are at an angle of + or – 30° from the horizontal or vertical. The angle you are dimensioning has one side at 30° and the other at 60° which yields an angle of 30°. The line you think of as being at 45° on the real shape is constructed by going up and to the left at an angle of 30° and a distance of 18 and then straight up 18 which yields a line at 60°.

It is possible to create the 45° dimension as it appears in the original drawing but it takes some fudging. First set the iso plane with isodraft to left. Now add an iso ellipse i and then trim it. Copy and explode an existing dimension line and move the arrowheads to the ends of the arc. Use MTEXT to add the 45°. Very clumsy!

A more important question to ask is why are you creating a 2D isometric? Are you doing this as part of an assignment for a course or are you trying to teach yourself how to use AutoCAD and thought this would be a good exercise. If you are doing this to teach yourself AutoCAD I would recommend creating the block in 3D with AutoCAD and then dimension the 3D object. If this is an assignment for a course and you were asked to create a 2D isometric I suggest you look for another course.

Re: How to make angle dimension in isometric

j.palmeL29YX — Mon, 26 Nov 2018 05:20:26 GMT

Unfortunately you didn't post a dwg as I asked above. So we don't know if you did draw a 3D-Model or only a 2D-geometrie in an isometric grid.

To answer your question: in a 2D drawing you can only measure the dimensions (and angles) as you have drawn. If you need the real dimensions (without a lot of calculations) you must build a 3D-Model and create the needed dimensions in the model space of this model.

Based on the given informations I added an example dwg ...

cadder