90 Degree duct elbow with changing dimmensions

jared_roman310

I am fairly new to OnShape and 3D cad like this as a whole.  I can rock some 2D AutoCAD, but getting my mind around 3D and a new software (OnShape) is for sure a learning curve.  I am sure this has been asked here, but I just can't figure out the correct keywords to find the answer. 

I am trying to make a 90º duct elbow but have it change size as it curves.  I know I can make the small curve then enlarge the duct once it is curved, but I would love for it to all happen in one motion.  

In my drawing I have the two rings that I want to connect. I have drawn an arc that I would love for it to follow as an example.  

https://cad.onshape.com/documents/d14916357e673b57fc158e16/w/d4207acca42da6afb006ac86/e/54a9837c97c8cd74faee1ce2?renderMode=0&uiState=65027a035ac9780d819637f2

MichaelPascoe

Hey @jared_roman310, welcome to Onshape! Loft is the feature for this.

One approach would be to use surfaces, then Thicken them into a solid part. This will allow the lofted portion to maintain a constant thickness. And, surfaces are easier to loft than solids at times.

Don't forget to use guides. Note that the guides need to Pierce the start and end profile for them to work. Also, I moved the profiles slightly apart so that they are not touching; Onshape doesn't like shared vertices with faces like this.

https://cad.onshape.com/documents/1b5e32c8a9897541f538fd12/w/db9deeb82bb7853ad6c08d49/e/8739fc8aa8b1f4e696...

MichaelPascoe

Hey @jared_roman310, welcome to Onshape! Loft is the feature for this.

One approach would be to use surfaces, then Thicken them into a solid part. This will allow the lofted portion to maintain a constant thickness. And, surfaces are easier to loft than solids at times.

Don't forget to use guides. Note that the guides need to Pierce the start and end profile for them to work. Also, I moved the profiles slightly apart so that they are not touching; Onshape doesn't like shared vertices with faces like this.

https://cad.onshape.com/documents/1b5e32c8a9897541f538fd12/w/db9deeb82bb7853ad6c08d49/e/8739fc8aa8b1f4e696...