How to proceed with complicated cylindrical shape in part

chris_squire145

I am re-creating a part that I want to modify to enlarge the electronics bay. I can't figure out the best way to proceed with the subject cylindrical shape in the photo, Indeed, I think my approach is not quite the same as the original part, as some of my extrusion lines don't match. Any ideas very much appreciated! Maybe I need a combination of exuding to a lesser height and lofting between two planes? I don't know the most efficient approach… it has stumped me.

https://cad.onshape.com/documents/6091a0722c60b008edf27c29/w/be9706f70e0dd1195ebf490b/e/9d8a0fb400424c135e4ceba6

MichaelPascoe

There are a few ways to make that cylindrical shape. I recommend doing a cut out from the side view which would involve a sketch and an extrude or two. This would generate the pocket as well as the flat area that the cylinder shape goes into. To get the cylinder shape, just create a sketch with that shape, then use the Revolve feature to create the cylinder.

Another way would be to Loft between two different shapes.

Or you could just use the Fillet feature on what you already have:
https://cad.onshape.com/documents/6c3d0b8f1bbadf81b5cb7e3d/w/616ce62407462adc6cd7abd5/e/6278b04ae…

chris_squire145

My onshape link didn't go through, I get a message "site's 'cad.onshape.com" robots.txt did not allow access to the url. I thought the link to my file would be clickable, Sorry this is my first post! I think pasting the link into your browser works. Any help much appreciated!

chris_squire145

https://forum.onshape.com/discussion/comment/115257#Comment_115257

I tried a sketch from the bottom up to the face, but it adds complications. The problem is that it is not a perfect cylinder. So a revolve will not work. It would be hard to loft between the surfaces? Thanks for your reply.

MDesign

might be advanced but you can use your extrude as is but hold it to end where the top starts to curve in. then use a loft with guides to complete the top rounded part.

chris_squire145

Wow, thank you for the help Michael! I am going to study how that was acheived and add it to my toolbox! There is so much to learn with 3D CAD and Onshape tools and tricks. This is my first "complicated part", prior to this I was just extruding knobs and Fan duct lofts. So I was very happy with the progress I made, having to decide where to proceed and how to do things, but I have a lot to learn still!

Thanks again!

MichaelPascoe

Sure thing! The best way to become efficient at Onshape is to complete the learning pathways.

https://learn.onshape.com/catalog?labels=%5B%22Learning%20Format%22%5D&values=%5B%22Learning%20Pathway%22%5D