ski goggles

[tyoung]

Hi everyone. I'm new here and was lookin for some input to help me with a final project for my autoCAD class. I've had 3 months of autoCAD (2009) experience and 2 years of 3d studio max experience.

 

I'm trying to draw a pair of ski goggles and I'm not sure how to approach drawing the lens. The lens is convex and tapers from the top edge to the bottom. Can it be done with the loft function? Can it be done with extrusion? Any help would be appreciated.

 

here are the ski goggles i'm trying to draw...

 

images.google.com/images?um=1&hl=en&rls=com.microsoft:en-us&tbs=isch:1&q=smith+i/o&sa=N&start=0&ndsp=21&social=false

[fuccaro]

Hello Tyoung!

It seems to me that the lens is a part of a sphere. isn't it? Draw a sphere, draw a profile as you see the lens from the front and extrude it. Intersect the two solids and you are done.

[fuccaro]

Here are some image to show you what I meant:

An extruded profile and a sphere:

 

After intersecting:

 

And after some more editing:

[ReMark]

Nice work fuccaro. How does one apply the taper though?

 

3,000+ posts! My belated congrats to you.

[ReMark]

Well I got mine to taper side-to-side but not top to bottom. Argh!

 

It's back to the drawing board for me. LOL

[ReMark]

fucarro, you inspire me!

 

By jove, 10 cups of coffee later, I think I've got it!

 

[fuccaro]

3000+ posts in... 8 years. These days I am not so prolific since I use AutoCAD just now and then. And also the version I use is outdated.

[fuccaro]

Here is one more try, this time in Catia. The lens is thicker to better show the draft angle around. It really took me less than five minutes, but relax, guys; I am not going to tell you to change your software

[ReMark]

OK...now I'm jealous. 5 minutes? What version of CATIA are you using?

[fuccaro]

We use Catia V5R18. There is a tool called Draft Angle, somehow similar to the Solidedit>Face>Rotate in AutoCAD, just more powerful.

See this image: the solid bellow is already drafted. On the solid on the right I selected a face (the dark brawn). Catia automatically extended the selection (the lighter brawn faces)

I pick the face I wish to keep unchanged and I enter the desired angle. Pretty easy, I would say.

[fuccaro]

ReMark

Reading again the thread I realize now that "tapers from top to bottom" is probable as you did it. It is in fact a variation of the thickness. I tried to adjust the faces forming the contour.

I will try to make an other model.

[fuccaro]

Me again.

Draw two concentric spheres and move the inner one a little bit up.

 

Draw the profile -it must be a closed polyline. Extrude it.

 

Subtract the inner sphere from the outer one. Intersect the two solids you have.

You can see here the growing thickness. It is due to the eccentricity of the spheres.

 

Now! We talked enough (mainly myself! ). Tyoung, is it what you try to do?

[UVAEngineer]

Thank you for this! I was trying to make some ski goggles myself for a project, and this has helped immensely!