topic Re: making body hollow with thin skin? in Fusion Design, Validate & Document Forum

making body hollow with thin skin?

valR7UZK — Fri, 05 Oct 2018 19:39:30 GMT

How do I hollow this body to a 0.25" thin skin?

Re: making body hollow with thin skin?

TheCADWhisperer — Fri, 05 Oct 2018 22:10:32 GMT

Do you have a *.f3d file?

Re: making body hollow with thin skin?

mavigogun — Fri, 05 Oct 2018 23:55:35 GMT

(I haven't seen the original design) There is some pretty "ugly" faceting at points in the STL model- if unintended. I converted the Mesh to A BRep, then Deleted Faces to parse faceting, but this results in small to not-so-small shifts in geometry. Next I 3D Projected the BRep Edges to Sketch, Patched the results, but the product then failed to Loft- there are just too many line segments that don't match well. However, there are enough reference points were you to create a Sketch wire frame of the part composed of far fewer- matching laterally in number -Splines and Lines. That process would require judgements only you can make, knowing the application of the part. I reckon the resulting body would have a far better chance of Shelling or Thickening successfully.

With the existing number of facets/segments, I was unable to Shell or Thicken the model.

This part isn't going to be printed, is it? If so, the print set up should ask for specification of the shell thickness.

Re: making body hollow with thin skin?

valR7UZK — Sat, 06 Oct 2018 14:55:09 GMT

This part (racecar side tunnel) is used to do CFD analysis of the air flow through it. It will be hand fabricated from composites using paper printed drawings as templates. Here is the f3d file. You will see the car itself in the Chassis component and the tunnel in the Tunnels component. The tunnel geometry is constrained by the chassis it is attached to. I could have created the tunnel sketch as an offset from the chassis but there are too many parts there.

Re: making body hollow with thin skin?

valR7UZK — Sat, 06 Oct 2018 15:00:59 GMT

Also the chassis was imported from SolidWorks where was originally created. I have the DXF sketches too but they are unusable because of the very large number of geometries they contain (computer slows down a lot).

Re: making body hollow with thin skin?

mavigogun — Sat, 06 Oct 2018 16:39:34 GMT

Here's how I tackled it:

I used the flat faces along the length of the part to place Construction Planes, then used those Planes to Split the Body into constituents that might be successfully Thickened in the Patch Workspace. After Thickening a segment, the Faces connecting to the next part do not bridge completely at all points, or present at an appropriate angle, so I performed a Press Pull on those faces, then Split the juncture again to produce a clean connection. The segments are then Joined.

I'm passing the design back to you with most of the process accomplished- I've left the 2 sections unJoined, and 1 section unThickened, so you can test the process to your satisfaction.