Modeling curved surface with angles

[Anonymous]

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

[JDMather]

Can you attach your *.ipt attempt here?

What version of Inventor are you using?

[johnsonshiue]

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!

[Anonymous]

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

Using Inventor Professional 2018.

[kelly.young · Accepted solution]

@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.

Please select the Accept as Solution button if a post solves your issue or answers your question.