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3D Sweep - Exhaust Pipe

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Message 1 of 5
drguitarum2005
3131 Views, 4 Replies

3D Sweep - Exhaust Pipe

I have several questions regarding 3D sketches, sweeps, etc. I consider myself fairly proficient in most basic 3D modeling but I haven't had to dive into 3D sketches too often.

 

I am trying to make an exhaust pipe and I have attached an example here. Basically it is a 3D shape so I drew two 2D sketches that represent "projections" of the final shape. Then used the intersection command within a 3D sketch to get the intersection. One of my problems is why doesn't the intersection grab the final, lower leg of the right-side sketch? I have to add that last 5" leg as a separate 3D sketch.

 

After doing this, I use the "bend" command in the 3D sketch to get my radii.

 

Can anyone offer some 3D sketch tips/advice and maybe suggest a better way to accomplish what I'm doing here?

 

I can draw the "un-filleted" shape using a bunch of 2D sketches but then I can't apply a fillet between two 2D sketches so I end up with sharp pipe corners.

 

Any thoughts? Thanks.

4 REPLIES 4
Message 2 of 5
JDMather
in reply to: drguitarum2005

Have you seen this tutorial

http://home.pct.edu/~jmather/content/DSG322/Inventor%20Tutorials/Inventor%2011%20Tutorial%207.pdf

 

It looks to me like that pipe size is going to have some pretty tight bends?

 

Your dimension is an approximation - Project the endpoint as shown and then make coincident to the line for the exact dimension.

 

Approximation.png


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Message 3 of 5
drguitarum2005
in reply to: JDMather

I will go through that tutorial to make sure I fully understand it.

 

As far as the bends, that's just an example. What we're probably dealing with is more of a 4" OD pipe with a 5" radius bend. Everything I'm modeling is able to be constructed with readily available parts and bends. I just threw that together as a quick example.

Message 4 of 5
JDMather
in reply to: drguitarum2005

Here are a couple of different techniques - depending on your design intent.

 

For better visibility - turn on Sketch1,2 (and then 3 rather than 2), but right click on them in the browser and turn off dimension visibility.

 

In the first example I added the fillets to the 2D sketches (might not be correct on non-orthoganal orientations) and in the second example I added Bends to the 3D sketch.


-----------------------------------------------------------------------------------------
Autodesk Inventor 2019 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional


The CADWhisperer YouTube Channel


EESignature

Message 5 of 5
drguitarum2005
in reply to: JDMather

You are correct, I forgot about that being an approximation. I should have extended out all the decimals. Just doing that did the trick. I will look at your other suggestions real quick...

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