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find equation of model's surface or equation of datum curve

acedill1
1-Newbie

find equation of model's surface or equation of datum curve

Hello, I have a mold that I created in ProE (not using the manufacturing "mold cavity" option, this is just a PART file. This mold is used to create a rubber model that looks like two hills with a valley in between on top of an elliptical disk (problem uploading image) My issue is that I want to find the exact equation of the surface of the model. Note: this means finding the equation of the indented surface of the "mold". Is there a way that this can be done in ProE? Or maybe, is there a way to extract the equation of a datum curve given that it wasn't created with an imported equation? Any help would be great. (If ProE knows the location of the contours, created by cross-sections, doesn't it know the location of the surface? I've tried picking plenty of points along the contours (datum curves) and fitting a polynomial through them (for each contour) but this is still not the exact equation of the contours. It seems like I should be able to click a surface, define some boundary (ellipse) and ProE will spit out an equation of that surface.)
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5 REPLIES 5
CM10
1-Newbie
(To:acedill1)

I seriousy doubt there's a way to get the data you want. Sorry.
DavidButz
1-Newbie
(To:CM10)

I'm curious. How exactly did you try "fitting a polynomial" to the Datum Points you created within Pro/E? Hey, FS, I was in your fair city overnight on vacation a week ago. (First time there, Dakota boy who has spent his adult life in Massachusetts.) Stayed with my wife in the Red Lion overlooking the falls, excellent dinner @ Collage, Museum of Idaho the next day. We had a great time there!

Fitting the polynomial can be done with Matlab using 'polyfit' on a set of points. I eventually just created a piecewise polynomial of the cross-sectional profile. The key was a batch file that took the .igs file and extracted the points and put them in an excel file. http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=23838&KW=export+points+excel

Kinda grasping at straws here, but did you check the order of the polynomial in Matlab? Someone told me many years ago that the Pro/E engine uses 9th order polynomials, but I couldn't confirm that that's the case, or even if it's remotely relevant for your particular geometry.
CM10
1-Newbie
(To:DavidButz)

"David Butz" wrote:

I'm curious. How exactly did you try "fitting a polynomial" to the Datum Points you created within Pro/E? Hey, FS, I was in your fair city overnight on vacation a week ago. (First time there, Dakota boy who has spent his adult life in Massachusetts.) Stayed with my wife in the Red Lion overlooking the falls, excellent dinner @ Collage, Museum of Idaho the next day. We had a great time there!

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