offset with increasing distance

[augeriu]

 

Hi everyone,

 

I would like to know if it's possible to create an offset curve from another curve, but with an increasing distance, the result i want to achieve is shown in the picture. (the magenta line).

 

Thank you very much!

[JD Mather]

From your image it looks like you are trying to offset an ellipse and create the offest as a true ellipse.

In Autodesk Inventor you can do this - there are two different offset options

1. offset uniform distance (like AutoCAD)

2. offset true mathematical ellipse

 

Is Tip 34 in this document what you are after?

http://home.pct.edu/~jmather/AU2006/MA13-3%20Mather.pdf

 

If this is what you are after and you only have access to AutoCAD you will have to draw the 3 ellipse rather than offset.

[augeriu]

thanks for your prompt reply JD.

 

In fact that's not exactly what i need, what i need is a progressive offset from a curve to another, like in this image i attach, i cannot build it with an elipse because the increasing distance will not be regular, (i don't know if my explanation is good enough, i attach another picture to see the effect i want to achieve

[JD Mather]

You will have to build the curves separately.

Inventor also has a Equation Curve tool if you know the equations for these curves.