Hi

I am having difficulty for getting a clean intersection of two tube surface. I use the sweep command . See attached files.

Appreciate any help.

Thanks,
-sharif

Hi Sharif, over here I tried using Sweep and it seems to be ok, results attached.

But note that to get a sweep with mitered corners you should select just one single profile curve - one at the start, not 2 selected at both the start and the end.

- Michael

Hi Michael;

Thanks for your response. There are two issues, one that when I try to thicken the sweep surface by using the shell command something weird happens at the intersection( see attached images 3 and 4 ). The second issue is cleaning the interior intersection of these interconnecting tubes. I used the Boolean Merge Command to delete but it didn’t work.

I appreciate if tell me what is the best method to create this shape (See image 5)

Thanks,
-sharif

Hi Sharif, the shell command will have problems with thickening junctures like that. So instead of shell the process i used was: Select one single profile curve. Run Construct > Sweep, select the central path as the sweep rail. Turn off "Cap ends", then finish the sweep. Now the outer surface is created. Next sweep the inner curve in the same manner. Then select the inner and outer curves and use Construct > Planar to make the end cap surface. Now select all 4 pieces and use Edit > Join to make the solid that I attached above.

For merging in the other piece I'd probably use Edit > Trim to do that, I'll see about giving you some steps for that in a bit here.

- Michael

Hi Sharif, so for the middle piece that you want to additionally merge in, do you want that to be sticking out on both sides or do you only want to keep the long side?

- Michael

Hi Michael;

Per your instruction I created the solid geometry of tubes and works great. Now the difficult part is the removing of interior portion of tubes at intersection. I tried the trim command and no result. To answer your question yes I wan to keep both sides and just make the inside to be clear between two tubes.

Thanks again for your help.

-sharif

Hi Sharif, is the attached model what you're trying to get? I found a little easier method using booleans instead of trim.

What I did to start with was make this tube all filled to start with, no wall thickness yet:




Now boolean union those 2 solids and that has the outer skin how it should be. You can now clear the inside of one direction by selecting the combined solid and using boolean difference with the inner curve as the cutting object.

To clear the inside in the other direction, extrude out the inner curve here a ways past the juncture and use that extrusion as the cutting object in boolean difference:



- Michael

Hi Sharif, probably the easiest method is to do that outside first for both pieces.

I mean generate 2 non-hollow pieces and boolean union those first:



That gets the outside formed. Now to clear out the insides, in one direction that can be done by boolean difference with this inner curve:



And to clear out the other direction, make a mitered one-rail sweep of this inner curve and use that object as the cutting object in boolean difference:



- Michael

Hi Michael;

Thank you for your help!. Per your instruction: step 1, I created the outer solid for both pieces and union them. Step 2, I did the same for the inner solid. Step 3, I use the Boolean differences and I subtracted inner solid from outer solid and it worked (See Attached Image)

-sharif

A simple 3 big extrude

Then 2 Boolean Merge, then Boolean Union don't make the trick ?








http://moiscript.weebly.com/uploads/3/9/3/8/3938813/tubeintersection_pilou.3dm

Hi Pilou,

re:
> A simple 3 big extrude
>
> Then 2 Boolean Merge, then Boolean Union don't make the trick ?
>
> http://moiscript.weebly.com/uploads/3/9/3/8/3938813/tubeintersection_pilou.3dm

Nope, not quite - your version does not have all the interiors fully cleared:



- Michael

I have sent the file before the last boolean merging! :)

Select All / Bollean Merge and you will have your result! :)
(of course on killing the parts merged resultant! )

Hi Pilou,

> Select All / Bollean Merge and you will have your result! :)
> (of course on killing the parts merged resultant! )

That doesn't work for me, did you mean to post a different file?

- Michael

Sorry for for the delay! New process! :)
(from the original post 1)Select only the 3 internal or external sections

- Big Extrude them one by one with closed faces enabled

- Boolean Merge the upper one (and kill the part not wanted)

- Kill the 3 curves sections

- Boolean Union All

- Kill closed 3 faces sections

- Select all then Shell (internal or external : Normal/ Flip following first choice at the beginning)

Seems fine! :)
Pinky is original
Gold is mine! :)

http://moiscript.weebly.com/uploads/3/9/3/8/3938813/tubeintersection_pilou2.3dm

Hi Pilou, yup I can follow your latest steps. But the Shell function isn't very reliable for thickening surfaces with sharp corners so it can be good to have a different way to do it.

- Michael

All the roads go to Roma! ;) (or almost :)