How do I continue the extrude of a smaller tube into a larger tube?

gyrex

Hi guys,

I have a tube which I am trying to extrude in a concave fashion into a larger diameter tube but I can't figure out how to do it. I've tried loft but it complains about the selection having an inner selection. I've attached an image below.

Many thanks in advance for any help!

My document is here: https://cad.onshape.com/documents/103df7df35e7f8b79d212ded/w/6b205c965461e2886eab2c08/e/019bab8de258b3667687b65e

daniel_splawski

I drew two lines on each sketch to break the ring into to pieces and then made two separate lofts for each half.  Perhaps it's a bit greasy, but it got the job done.   

Perhaps a better strategy would be to draw the cross section of the part from the front plane and use a revolve to make the part

https://cad.onshape.com/documents/304888033b5f092d2259f0ae/w/839ecc2e9e26619b83473c43/e/c5b9ede1d434e8f227a7fc9f

john_mcclary

+1 to revolve

If you had the fore-sight to know this taper was required at the beginning. It would most likely be a good candidate to have the entire profile of the tube and flange revolved from the same sketch.

But there is nothing wrong with adding this on later as a design change, especially if you already have references to your tube body.

emagdalenaC2i

@gyrex With the sketchs you have created, You can:

1. create a loft with the inner circles
2. create a shell (and press the opposite direction button)
3. You can create a bolean feature if you want to create a single part

https://cad.onshape.com/documents/de41813d4a9fc93ab7da9ddf/w/501862f0c49bfdd126c0c8a6/e/560b9b7d60980fea99907f96

daniel_splawski

I drew two lines on each sketch to break the ring into to pieces and then made two separate lofts for each half.  Perhaps it's a bit greasy, but it got the job done.   

Perhaps a better strategy would be to draw the cross section of the part from the front plane and use a revolve to make the part

https://cad.onshape.com/documents/304888033b5f092d2259f0ae/w/839ecc2e9e26619b83473c43/e/c5b9ede1d434e8f227a7fc9f

john_mcclary

+1 to revolve

If you had the fore-sight to know this taper was required at the beginning. It would most likely be a good candidate to have the entire profile of the tube and flange revolved from the same sketch.

But there is nothing wrong with adding this on later as a design change, especially if you already have references to your tube body.

gyrex

Thanks guys, I went with the revolve option

emagdalenaC2i

@gyrex With the sketchs you have created, You can:

1. create a loft with the inner circles
2. create a shell (and press the opposite direction button)
3. You can create a bolean feature if you want to create a single part

https://cad.onshape.com/documents/de41813d4a9fc93ab7da9ddf/w/501862f0c49bfdd126c0c8a6/e/560b9b7d60980fea99907f96

gyrex

Thanks for all the wonderful suggestions, as usual, the OnShape forums are a wealth of knowledge and I really appreciate the help. In the end, I went for my first revolve I really need to watch some more videos on how to use CAD instead of trying to figure out my way around it by myself...

john_mcclary

There are a lot of good videos on the onshape youtube chennel. But there are so many methods of doing the same thing. It's good to practice using different ways. Then attempt to edit them or break them (turn red). See which ways are easier for you to draw and modify. And get a feel for all of the tools.

Even something as simple as this, you got a few different answers to the same problem. All of them are correct. It's more important to understand how hard it would be to edit them after you have other parts attached either in a part studio or in an assembly.

https://youtu.be/tPS51xas30k

Has a lot of pro tips