# Thread: How To Dimension An Elipse

1. ## How To Dimension An Elipse

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I'm trying to dimension the diameter of the elipse in the attached dwg.
I do dimension, diameter and it asks to select the arc or circle. I select the elipse and it tells me it's not an circle or an arc. I know this, but see no other option under dimension for elipse.

ISO.dwg

I think you can dimension only long and short axis and lengthen of ellipse.

3. Originally Posted by mdbdesign
I think you can dimension only long and short axis and lengthen of ellipse.
I have my osnap/quadrant set to on, but it doesn't snap to the quadrant of the elipse. You lost me on the long and short axis thing.
BTW, I'm using 2009LT.

DIM ELLIPSE.jpg

5. Originally Posted by Ryder76

Attachment 20420
Could you look at the elipse in the drawing I attached. I got the snap/quadrant to work, but the elipse is in isometric. It snaps to a quadrant, but not right for a dimension as you have shown above.
Also, what type of dimension should I use? Aligned?

6. Ok I did not open your dwg.
Draw temp lines from midpoint of outside face edges across ellipse (like ellipse center line) and dimension between intersection of ellipse and lines.

7. Originally Posted by mdbdesign
Ok I did not open your dwg.
Draw temp lines from midpoint of outside face edges across ellipse (like ellipse center line) and dimension between intersection of ellipse and lines.
Sorry, but I'm confused with this. Not sure what you mean by midpoint of outside face.

I will have to continue this tomorrow, as I must leave work now.

8. It appears to me that your attempting to dimension a circle in an isometric drawing. If you dimension it from that view the measurement will be incorrect. You need to project it to a front or top view in order to get it correct.

Edit:

On second glance my comment about the dimensions apply to your others as well. Those dimensions are going to be incorrect because of them being longer or shorter than what they actually would be in the front, top or right side views.

9. Originally Posted by ScribbleJ
It appears to me that your attempting to dimension a circle in an isometric drawing. If you dimension it from that view the measurement will be incorrect. You need to project it to a front or top view in order to get it correct.

Edit:

On second glance my comment about the dimensions apply to your others as well. Those dimension are going to be incorrect because of them being longer or shorter than what they actually would be in the front, top or right side views.
Just answering question of dimension of ellipse. Of course it is isometric view of circle.

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I think the commonly accepted way to do this would be an auxiliary view, where your view is perpendicular to the face with the circle, so you're seeing the feature in question in as a circle, and not an ellipse.

If that's not an option, you might want to fake it. An ellipse doesn't really want to be dimensioned that way because it doesn't have a standard radius or diameter. You might want to get creative with a LEADER/MLEADER to make it look like your diameter dimensions, and manually type in the desired dimension.

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