How to create curved oval (like a Pringles chip)?

[DezinerDiva]

I want to be able to have a radius along the width of an oval, similar to the way a Pringle's potato chip looks. What method is used to do that?

Thank you in advance!

 

[NateLiquidGravity]

Cut an additional oval or circle shape from the side.

 

[DezinerDiva]

In sheet metal or part modeling?

I want it to look like I formed an oval sheet over a rod or tube. And I need a specific radius.

Thank you!

 

[HaroldL]

Here is one way of creating your part in sheet metal. Try different values for the dims in sketch<1> to set the size and radius of the curve. Adjust the sketch dims for Cut<2> for the size of the oval. (Note: this was created in Alibre Design 2017 from Alibre LLC. If you haven't upgraded yet you may not be able to open the file.)

 

[bemfarmer]

In MoI, the Enneper minimal surface, with maxRadius of 0.25, and a bit of 1d scaling, makes a good looking Pringle surface.
- Brian

 

[bigseb]

Pringle Chip? Like this:

 

[bemfarmer]

Wikipedia says that the shape of a pringle is that of a hyperbolic paraboloid.
I seem to recall them to be "oval" rather than "round," but have none to measure
- Brian

 

[bigseb]

Wikipedia says that the shape of a pringle is that of a hyperbolic paraboloid.
I seem to recall them to be "oval" rather than "round," but have none to measure
- Brian

I just tried to show the method. Any profile sketch can be used.

 

[DezinerDiva]

Take the dip out of the middle of the chip and form the oval around a tube (lengthwise). I need to be able to come up with a flat pattern for the object to be cut on the waterjet.

Thank you!
Lisa

 

[DezinerDiva]

Take the dip out of the middle of the chip and form the oval around a tube (lengthwise). I need to be able to come up with a flat pattern for the object to be cut on the waterjet.

Thank you!
Lisa

HaroldL had the correct shape. - Lisa

 

[HaroldL]

I went back in and tweaked the Contour Flange sketch in the model so it will now create a flat pattern without throwing an Acis error. I added a short flat section on the opposite side from the original. I then adjusted the Oval cut sketch so it will leave a very small flat on the sides. Alibre needs a flat portion on the part in order to create a flat pattern or insert the Unbend/Rebend steps.

 

[DezinerDiva]

This is what we came up with here. I think this works quite well, as we can control the curve easily and obtain a flat pattern. Thoughts?

Thank you!
Lisa

 

[HaroldL]

That appears to be a badge or name plate that would be attached to something like, say, the down tube on a bicycle. I think that will work better than the method I used with a contour flange.

 

[DezinerDiva]

Actually, it's a part to an incredibly expensive light fixture. ;-) But we need to cut the parts on the waterjet, so a flat pattern is required before cutting and then we form it in the shop.

Thanks everyone for the input! It is greatly appreciated!
Lisa