Trying to shell out a part.

wayne_sauder

This part will not shell unless unless I reduce wall thickness to 10 thousandth I would like wall to be .125 of a in. How do i get the project on here?

philip_thomas

In general, for something to shell, the smallest outside radius must be bigger than the shell thickness.
A failure to shell occurs when that outside radius tends to zero.

I say 'in general' as there are algorithms that make this process less sensitive to faces disappearing etc, but they dont always work so its a good idea to know how it works.
If you must have an outside radius that's smaller than the shell thickness, you can try putting those on after the shell.
Other shenanigans are possible, but you would have to share the document

Good luck!

3dcad

Can you make your document public and post link?

wayne_sauder

 Sorry I didn't think before posting. Due to the nature of the project I can't make it public. I would be interested in some discussion, on what the shell command looks for. I have used it in the past, sometimes with no problems, other time I have had to go back and model again using a different workflow to get it to work. the problem is I am not always sure what I change to make it work, just that I change something.  

bradley_sauln

Hey @wayne_sauder, if you file a feedback ticket in the document and select the 'share with support' box we can take a look at it and give you some insight.

philip_thomas

In general, for something to shell, the smallest outside radius must be bigger than the shell thickness.
A failure to shell occurs when that outside radius tends to zero.

I say 'in general' as there are algorithms that make this process less sensitive to faces disappearing etc, but they dont always work so its a good idea to know how it works.
If you must have an outside radius that's smaller than the shell thickness, you can try putting those on after the shell.
Other shenanigans are possible, but you would have to share the document

Good luck!

wayne_sauder

Thank for the insight, I did do a support ticket for this particular project and got the help I needed on it. Still, appreciate the good info shared here   

billy2

Shells worked well in CAD demos to amaze the audience. In practice, they do fail, and they're cpu intense.

I tend not to use them because of CPU time. I'll offset outer faces and build my own shell. The main reason is regeneration time on deep rebuilds, I don't want to wait. I have found that I'm better at shelling than the shell algorithms. I know this isn't what you want to hear, but its the truth.

Of course, yesterday I used a shell to get something done quickly. I was amazed it worked. In fact I'm always amazed when it works. It's fun to watch.

My point, as your geometry gets more complex, you might be better off building the shell yourself and subtracting it from your part. There will be a day when you might want to try this approach.