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ELLIPSES TURN INTO CIRCLES

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05-21-2008 12:31 PM

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 4

Re: ELLIPSES TURN INTO CIRCLES

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05-21-2008 04:09 PM

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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05-22-2008 06:59 AM

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."

>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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05-22-2008 10:00 AM

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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05-22-2008 11:45 AM

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."

>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

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