How to make angle dimension in isometric
Please post an example (dwg), what you want to do.
cadder
Jürgen Palme
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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.
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.
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.
@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.
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
Jürgen Palme
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