29 Replies Latest reply on Mar 7, 2013 1:25 PM by Giannis Gennarakis

# Problem with Revolving a Filled Area

Hi there,

I want to make a solid hemisphere. I found the way to do it by making to hemicycles and drawing two lines joining them (as seen on the picture). Then, when I revolved the sketch by 180 degrees I realised the hemisphere to be hollow!! I then tried to find a way to make it solid. I went back to the 2-D sketch and filled the surface (Insert->Surface->Fill) inside the hemisphere. I saw some lines (which I don't know exactly why they appeared inside the surface) and I noticed that the hemicircle had become more of polygon (not an exact circle). I was OK with that since the difference was not that visible when I zoomed out, but then I had a problem revolving the sketch. I want to revolve it around a centerline but you can see on the picture the error that pops out. Any help and explanations on the above matter would be much appreciated!!! (as I have to fill many parts now that I realised that they are all hollow!!!)

P.S. I found online a video on how to make a bowl. (   http://www.youtube.com/watch?v=FgH3C1HadvM   ) But that procedure is way to long from where I am now, and I feel I'm close to making it solid!!

• ###### Re: Problem with Revolving a Filled Area

Edit sketch. Make internal arc construction, or delete it. Join the two ends with a line. Exit sketch.

• ###### Re: Problem with Revolving a Filled Area

Sorry but I can't understand what you re saying. (actually I'm new to Solidworks). How can I make an internal arc construction? I didn't find any button with that name. Can you please be more specific?

• ###### Re: Problem with Revolving a Filled Area

Find the tutorials inside of SW and do a few.

• ###### Re: Problem with Revolving a Filled Area

for the revolve feature, the geometry of your sketch cannot cross the axis/centerline you want to revolve around.

any line in a sketch can be toggled between "geometry" and construction - select the sketch item, and there is a checkbox in the property manager for "make construction" or the pop-up toolbar by your mouse has a botton that wil do it also.

• ###### Re: Problem with Revolving a Filled Area

Your sketch intersects the centerline. You want your sketch to end at the pole of the hemisphere. It should be 90 degrees of sketch.

Dwight

• ###### Re: Problem with Revolving a Filled Area

I still haven't found a way and I 've lost already too much time on this. I think it's simple and I can't imagine solidworks not to have this feature. I tried 3 examples but none of them filled the surface. For example both the candle holder and the water pistol made the parts look empty inside when I viewed them with section view. So, let's simplify more the problem by trying to make a full solid sphere. If I find a way to do that I can also make the hemisphere afterwards....

My thinking is that the road to get there is, make a 2D drawing, surface fill it, and then revolve it. But none of the "revolved surface" or "revolved boss/base" can do that and it gives me all the time errors which I cannot work out. I could easily make the empty hemisphere with no errors and I can't find why filling is that difficult. I would like somebody to write the exact procedure on how to reach the solid sphere. Or link me to an exact example...I don't think it takes too much to do that...Thanks in advance SW Community!!

• ###### Re: Problem with Revolving a Filled Area

If all you want is a solid sphere, here's one.

• ###### Re: Problem with Revolving a Filled Area

As for the sphere, I couldn't open it. "An error was encountered while trying to open your file. Please...." I have SW 2012 if it's a compatibility issue...And all I want is not just the sphere but the procedure to make it solid. I don't want the fish, I want to learn me how to fish, cause I have to make more than another 40 parts into solid!!!

• ###### Re: Problem with Revolving a Filled Area

Here's the sketch that I used with the Revolved Boss/Boss function.  Choose the vertical line for the Axis of Revolution and it will produce a solid sphere.

• ###### Re: Problem with Revolving a Filled Area

I did it. Go to section view to see that's not filled inside it...It's empty...

• ###### Re: Problem with Revolving a Filled Area

I cut out part  of it.  Looks solid to me.

• ###### Re: Problem with Revolving a Filled Area

when I also cut it, it looks like solid inside cause the cut boundary regions are surfaced. But if you want to have a look inside, go to section view.

• ###### Re: Problem with Revolving a Filled Area

Here's the section view.  Still looks solid.

• ###### Re: Problem with Revolving a Filled Area

Did you maybe have the Thin feature selected when you created your Revolve?

• ###### Re: Problem with Revolving a Filled Area

No I didn't select the thin feature.

• ###### Re: Problem with Revolving a Filled Area

You may want to go through the SW tutorials, this will help you greatly.

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I went through some tutorials but I can't see all tutorials to make a certain function. This is not always the answer, and that's why this forum is here. And if you know in which tutorial is the answer please guide me. The hemisphere which you sent me is the one that I want to fill with as you can see in the picture I send you back. I want to fill "the inside" where the arrow points..

• ###### Re: Problem with Revolving a Filled Area

Are you using a certified graphics card with a certified driver? I think your section view is the issue.

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I'm not having a graphics card on my laptop. It uses Intel Graphics through the processor (i3). Check my reply at to Mr.Closson.

• ###### Re: Problem with Revolving a Filled Area

Does the top of your feature tree have a folder for surface bodies? If there is only a folder for solid bosies, the bodies are solid. This would indicate you're suffering from a hardware/driver issue. I can guarantee you with 100% certainty the file I provided was a solid model, not a surface model.

• ###### Re: Problem with Revolving a Filled Area

I can assure you 100% that you are RIGHT!!! The problem was not in solidworks but to the program I was importing the stl files to (SIMION). For a reason it was cutting the inner solid and was leaving just the surfaces ("solid points under surface normals" was the setting) maybe to cut down some memory while converting. The whole issue was guiding me to the wrong direction cause I was seeing empty bodies in SIMION and empty bodies in SW (at section view) and I believed they were truly empty (but I never checked the import settings, cause I was focused on SW as I believed was the root of the problem at first point)!!

Through focus in every detail and never giving up till you really understand what's going on, progress comes. Thanks everyone for your support and your really fast answers!! It seems it really is a "LIVE" forum here!!

• ###### Re: Problem with Revolving a Filled Area

If I understand you correctly, you don't want to use the Revolved Surface tool, rather the Revolved Boss/Base tool to make a solid.

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I don't know but the revolved surface didn't work correctly for me. All the shapes I've made are by revolved boss/base. The problem is that when I look inside them via the cross section, they are empty. And that's a problem when I export them to stl and import them to another program which wants all these parts to be full solids...

• ###### Re: Problem with Revolving a Filled Area

When you look at the section view, do you have "Show section cap" checked?

If it's not checked, your object will appear hollow.

Does the Feature Tree list your object as a Solid Body or a Surface Body?

• ###### Re: Problem with Revolving a Filled Area

I checked that. When I select that it just shows a "cap". It's not solid. And that's the problem. I checked that when I exported the part to an stl and imported them to the other programm. There I could clearly see it was empty inside. So the cap feature it's just to place a cap at the section view. There are actually not solid points inside the part.

• ###### Re: Problem with Revolving a Filled Area

What program are you checking this with? An STL is a generic file format, handy for getting prototypes printed. However, if you open it up in the likes of 3dStudio Max, it will appear as a surface.

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I installed "Rhinoceros (Evaluation Version)" and I exported the part to stl. Nothing happened. The same problem. Then by changing my mind for a while and believing that SW can't be wrong, I focused on the import settings in SIMION (where I used the parts) and found that I had the wrong settings (which made all bodies hollow!!!). Thanks a lot for your help. I really feel relieved at this moment cause otherwise I had to change almost 40 parts to a solution that seemed unreachable!!

• ###### Re: Problem with Revolving a Filled Area

I probably need to apologize.  I just noticed that this discussion is in the Surfacing section.  The model I posted didn't use Surfaces, it's a solid Revolve.

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I found out that the problem was lying in the importing settings of the program I wanted to use them (SIMION). It was making the bodies hollow. Thanks a lot for your help!! And as I realise now you can't revolve a surface more than 180 cause it will touch itself!! All these errors where there for some reason and the body was already solid!!