How Can I Make Surfaces Solids to Add to the Part? (No, it's not as simple as Fill or Enclose)

Hottestsauce

Hello everyone!  I was working on a design for a pen as my first CAD project.  I made the bore, and metal clip, but when I began on the end cap, I hit a problem. . .  In order to make the cone on the end, I decided to try to loft from the big cylinder to a smaller ring, making a hollow cone with a hole for the nib.  However, after messing around with the loft tool, all I got was an error stating "Cannot use faces or regions with inner loops as profiles."  After that I tried lofting the inside and outside edges individually, and that worked alright, but I was left with two surfaces and no way to make them solid.  I've tried the fill tool, encolose, and I can't figure out how to make it solid!!!  It's also annoying, because in the assembly, the tip inserts without the end cone.  Any help is much appreciated!  Pics included, and here is the link to the design:
https://cad.onshape.com/documents/52ce21b1c3711761bb09d215/w/0f394c8a603e3337b1e67d69/e/938e084e23bf97e733576453?renderMode=0&uiState=653d70dae659ee01998e9b3c  

If you need any more info, just let me know!

robert_scott_jr_

Hello. Using the Thicken tool on the outer surface worked but attempting to add the feature to the existing pen body vs. creating a new part would not work until I fixed the 'threading shape' sketch to ensure that the vertical flat of the triangle truly intersected with the inside wall of the pen body. By the way, in the process of making this work I did go ahead and created a new part (cone) but then trying to boolean the cone and pen body together failed due to the bad thread. - Scotty

https://cad.onshape.com/documents/d5b4998e525d6052cece2f5c/w/c964c56b742086d174de603a/e/c34687e5fe079f1dcf2e6d3b

robert_scott_jr_

Hello. Using the Thicken tool on the outer surface worked but attempting to add the feature to the existing pen body vs. creating a new part would not work until I fixed the 'threading shape' sketch to ensure that the vertical flat of the triangle truly intersected with the inside wall of the pen body. By the way, in the process of making this work I did go ahead and created a new part (cone) but then trying to boolean the cone and pen body together failed due to the bad thread. - Scotty

https://cad.onshape.com/documents/d5b4998e525d6052cece2f5c/w/c964c56b742086d174de603a/e/c34687e5fe079f1dcf2e6d3b

Hottestsauce

In the Threading Shape sketch, what did the two lines running up the cylinder do?

                                         V

Hottestsauce

In the Threading Shape sketch, what did the two lines running up the cylinder do?

                                         V

robert_scott_jr_

There's only one line. The vertical element of the triangle profile in your sketch was not coincident with the inner wall of the cylinder. I suspect that when you initially did the sweep it just created a new part and to make it be part of the cylinder you added a rectangle to the profile and added that to the sweep. I 'Used' (sketch Use tool) the inner wall of the cylinder which created that line and used that line as the vertical element of the sweep profile, thus ensuring the needed coincidence.

- Scotty

P.S. There is a FeatureScript or two available to make threading an easier task. ThreadCreator is one.