ELLIPSES TURN INTO CIRCLES

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Hi,
I've got this issue where I'm creating a drawing from a spreadsheet, and it passes
variables, then the user saves it as the new drawing.
I use a set of concentric ellipses, with tangential vertical lines.
If the user enters a set of values that make the ellipses circular, they then apparently
change to circles.
I am unable to modify these circles back into ellipses.
Are there any sets of "AUTO ASSUMPTION" Relations that need turning off?
Thanks,
-Andy.

www.continual-motion.com
4 REPLIES

Re: ELLIPSES TURN INTO CIRCLES

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Andy,
I placed an ellipse and placed four lines tangent to the ellipse. Two are
horizontal and two are vertical. Initially the ellipse is 200 by 100. I
placed dimensions between the vertical lines and the horizontal lines. I
changed the value of the dimension between the veertical lines to be 100.
The ellipse is circular but is still an ellipse. If I change the value of
the dimension to 150 it will become elliptical again.
I also can just place an ellipse and change the primary ans secondary values
to be equal and it remains an ellipse.
Can you provide an example?
Regards,
Rick B.

Re: ELLIPSES TURN INTO CIRCLES

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Thanks Ricky,
This is driving me up the wall.
I think the instance I am using is a little more complex than the quick mock up
you did, as there are a few other relations etc to keep it concentric, but I can't
see which one is causing the trip.
-Andy.


"Rick B." wrote:
>Andy,
>I placed an ellipse and placed four lines tangent to the ellipse. Two are
>
>horizontal and two are vertical. Initially the ellipse is 200 by 100. I
>placed dimensions between the vertical lines and the horizontal lines. I
>changed the value of the dimension between the veertical lines to be 100.
>
>The ellipse is circular but is still an ellipse. If I change the value of
>
>the dimension to 150 it will become elliptical again.
>
>I also can just place an ellipse and change the primary ans secondary values
>
>to be equal and it remains an ellipse.
>
>Can you provide an example?
>
>Regards,
>Rick B.
>
>

www.continual-motion.com

Re: ELLIPSES TURN INTO CIRCLES

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Andy,
I did figure it out from your example. I was able to simplify the example
with a single elliptical arc and horizontal/vertical lines. This is a
problem that I will report. Right mouse click on the elliptical arc and
click on properties. If the primary axis and secondary axis ever become
equal, then the eliptical arc starts acting like a simple arc when driven
dimensionally. If you modify the properties of the elliptical arc by
changing either the primary or secondary axis then it will start acting like
an elliptical arc again.
Regards,
Rick B.

Re: ELLIPSES TURN INTO CIRCLES

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I think I understand.
You mean I should dimension to the primary and secondary axis of the ellipse and
not the tangential lines?
I'll give this a go.
It's a little inconveniant as it means another equation in the variables table (the
minor axis was previously driven dimension) but not too much of a problem with the
major (horizontal).
Worst case scenario, I'm using this as a basis drawing so should one of the arch
turn into a circle, it's not too bad, as another version can be pulled off the original.
Thanks for your help.
-Andy.

"Rick B." wrote:
>Andy,
>I did figure it out from your example. I was able to simplify the example
>
>with a single elliptical arc and horizontal/vertical lines. This is a
>problem that I will report. Right mouse click on the elliptical arc and
>click on properties. If the primary axis and secondary axis ever become
>equal, then the eliptical arc starts acting like a simple arc when driven
>
>dimensionally. If you modify the properties of the elliptical arc by
>changing either the primary or secondary axis then it will start acting like
>
>an elliptical arc again.
>
>Regards,
>Rick B.
>
>

www.continual-motion.com