topic Re: Modeling curved surface with angles in Inventor Forum

Modeling curved surface with angles

Anonymous — Thu, 07 Sep 2017 17:07:08 GMT

Looking for a better solution for how to model the attached items:

Currently I'm sketching the bottom curve, then offsetting a work plane to sketch the top curve on. At this point I'm lofting the 2 sketches together and then attempting (without success) to loft (cut) the rounded top section.

I don't have a lot of experience with items that both curve like a cylinder, but also have a protrusion on an angle.

Thanks in advance for the help.

kelly.young has edited your subject line for clarity: Looking for a better solution

Re: Modeling curved surface with angles

JDMather — Thu, 07 Sep 2017 17:07:23 GMT

Can you attach your *.ipt attempt here?

What version of Inventor are you using?

Re: Modeling curved surface with angles

johnsonshiue — Thu, 07 Sep 2017 17:07:37 GMT

Hi! I took a quick look at the drawing images. I think I would approach this case using surface modeling. You simply needs to model a surface (one side: inside or outside). Then thicken the surface. You might need to draft the side faces afterwards. Another possibility is to create two surfaces (inside and outside). Then create a loft solid based on the two face loops.

Many thanks!

Re: Modeling curved surface with angles

Anonymous — Thu, 07 Sep 2017 17:07:49 GMT

Not allowed to post the .ipt. Only the screen shots.

Using Inventor Professional 2018.

Re: Modeling curved surface with angles

kelly.young — Thu, 07 Sep 2017 17:47:44 GMT

@Anonymous I see that you are visiting as a new member to the Inventor Forum.
Welcome to the Autodesk Community!

The first thing I did was sketch all three views to get the geometry as a reference.

Created a Plane on the front face at an angle and projected the curve to it (3D Sketch9).
Then used these sketches to create a front and back Boundary Patch.
Used Sculpt of these two to make a solid.
Started a 3D Sketch for the top curve and another for the bottom curve.
Projected the edges and used Sketch2 for Projected Geometry point of the center of the arc.
It then did not like the 3D Sketch and broke the links turning them pink. Not sure why.
Edited the 3D Sketches and deleted all constraints to turn them back to black. Not best practice but this is my initial attempt.
Lofted Intersection to give the final shape.

You might find a better solution, but this is what I came up with to start. I notice that there are a few dimensions that might need to be modified, specifically d4, d14, d51 in Sketch1, had to fudge them to make the points meet up. See the yellow circle in picture.

I didn't model the rest of the features or the other part but this might point you in the right direction as to how to get started. Hope this helps!

Edit: After reviewing the part, the arcs don't match up with the top view of Sketch3 because I didn't project the 3D Sketch to the surface so the arc isn't right. I would bet @johnsonshiue method is much more accurate and elegant. Trial and error, the life of a designer.

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