Shell on an object with a pushed split face crashes the software

Shell on an object with a pushed split face crashes the software

Anonymous
Not applicable
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Message 1 of 11

Shell on an object with a pushed split face crashes the software

Anonymous
Not applicable

 Hello everyone,

 

I am having a peculiar problem.

I am trying to create a simple mold and, to test the principle, created a design.

 

Shelling the back part is no problem:

shell1.png

However, shelling the front part with split and pushed geometries crashes the software:

 

shell2.png

I was able to circumvent the problem by shelling then pushing the inside of the mold, however in order to save as much material as possible, I'd like to be able to shell it as it is.

 

Anyone ran into the same problem?

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Message 2 of 11

ahreum.ryu
Autodesk Support
Autodesk Support

Hi @Anonymous, 

 

Thank you for reporting your issue. 

I tried to reproduce it, but I couldn't. Do you mind sharing your model? 

I created it similar with yours but it worked well. please ignore my ugly sketch Smiley Sad

img (63).jpg

If I missed something, please let me know. 

Many thanks,

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Message 3 of 11

Anonymous
Not applicable

Hey @ahreum.ryu

 

I see what you did here ^^ You did an extrusion and not a push I believe which makes simpler geometries.

 

The link to the design is here:

http://a360.co/2fms1Tf

 

I also included a screencast just in case.

https://knowledge.autodesk.com/community/screencast/3e007375-15f2-45c5-b2b8-c4b1ff708205

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Message 4 of 11

ahreum.ryu
Autodesk Support
Autodesk Support

Hi @Anonymous, 

Thank you for sharing and your screencast was also really good for me to better understand. Smiley Happy

 

I’ve looked into your model and figure out something.

In conclusion, we can’t apply to shell with 5mm on your model. Because the shape would have large topology. Therefore when doing offset to the claw, it couldn’t create it. Please take a look at image below.  It was succeed when having 2mm.

img (24).jpg

 

One more thing, I figure out your imported sketch would be overlapped so I created a new sketch along with your original sketch. 

Overlapped.

img (18).jpgimg (17).jpg

 

And if you want to use 5mm shell, it needs “patch” environment.  I’m sharing how to create it and my file. Please take a look at this.

 

 

 

If I missed something, please let me know. 

Many thanks.

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Message 5 of 11

Anonymous
Not applicable

Hello @ahreum.ryu,

 

I did try a 2mm shell, however this happened:

http://autode.sk/2fAOX0k

 

I even tried a 1mm push on a 3mm shell, to no avail, there seems to be a problem with the computation here.

 

Thank you for your reply. However, as you can see in the inside of the mold I shared, your answer does simply not answer my question.

 

I would need a 3mm shell to be created around the features, for such an inside to actually mold the candle:

moule.png

 

Which is unfortunately not quite what the end result of what you propose me to do.

 

Thinking I was being under the wrath of the CAD gods because I was lazy and that I just imported a SVG file, I did redraw the paw mark on the geometry with a much simpler splice-based sketch, sadly to no avail.

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Message 6 of 11

PhilProcarioJr
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Mentor

@Anonymous

The reason it wont shell properly is because of the claws, they are small and pointed and would cause a geometry overlap which is why it crashes or fails. If you create another sketch without the pointed tips it shells fine. It also doesn't help that there are tons of errors in your claw sketch.



Phil Procario Jr.
Owner, Laser & CNC Creations

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Message 7 of 11

Anonymous
Not applicable

Hello @PhilProcarioJr,

 

I tried to do as you mentioned. Sadly no luck.

http://autode.sk/2fBjzz1

 

 

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Message 8 of 11

PhilProcarioJr
Mentor
Mentor

@Anonymous

Do you have the image or svg for the paw?



Phil Procario Jr.
Owner, Laser & CNC Creations

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Message 9 of 11

Anonymous
Not applicable

There you are @PhilProcarioJr I can also share the project file with you : http://a360.co/2eRd0ao

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Message 10 of 11

PhilProcarioJr
Mentor
Mentor

@Anonymous

I still don't understand why your doing this. You say it is to save material but we're talking about maybe 0.20 cents of material and your molds will be weakened and more likely to tear meaning you will get less candle castings per mold. I can figure this out for you but it seems like a huge waste of time.



Phil Procario Jr.
Owner, Laser & CNC Creations

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Message 11 of 11

Anonymous
Not applicable

At that point it is more a "why isn't it possible when the geometries seem simple enough" than a practicality standpoint. But I see your point.

 

If you're interested you can go ahead, otherwise I'll let it go and use the workaround I found 😃

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