create an asymmetrical 3d box?

[Anonymous]

Hi everyone,

I am brand new to Fusion 360. I am not a designeer / engineer but I have a medical background. I need to create 3d models of tooth implants in order to calculate their volume. Essentially they are a shape with 6 faces (top, bottom, front, back, left, right). However, they are assymmetrical because each edge has a different length. Here is a CT scan of one of them: 

I have tried modifying a box primitive or building a 3d solid line by line to no avail so far.

Any tips will be hugely appreciated.

Thanks.

J

[TrippyLighting]

I'd suggest that you watch a number of the turorials in the learnig  section. That will  provide you with the necessary basics.

If you then still have questions, or even more (not unusual 😉 ) than come back to this thead and you'll be helped.

In short, you can create two sketches, each with a rectanguar profile. Then you can create a loft between these profiles. there are many ways to get these simple shapes in Fusion 360.

[Anonymous]

Thanks TrippyLighting,

I have seen the tutorials but none of them answered my questions. I've also watched some from Lynda.com. The best way will be to use lines because each side is a different length. My problem is that when I put all the lines together Fusion is not able to calculate the volume. I have uploaded a project file here to demonstrate:

https://drive.google.com/file/d/0B42SD0svf51CbzhwbFVFOEZjZ0k/view?usp=sharing

Best wishes
J

[TrippyLighting]

If you want to share a Fusion 360 file, the best way to do that - at least for small things - is to export it as a .f3d file and attach it to your next post.

IGS is a generic solid model format that does not contain any application specific information and as such is not of much help.

[Anonymous]

Awesome.  I did some work with implantable orthotics in college, but haven't done anything with it since.  I'm still romancing the idea of 3D printing through the flesh directly inside the body somehow.  To do this part, you should try 3D sketches.  Then loft from one face to the other.  I'll see if I can get to this later tonight and post something.

[Anonymous]

That IGES appears to be an empty file.  what is the raw data you are starting with?  A .tiff from an electronic Xray?  Or an .STL from an imaging tool like an MRI or CT?  Depending on how precise you need it to be, it may be easiest to make this with T-Splines.  I'd be happy to help you out if you want to do a screen share.

eric.peterson@lagomideas.com

[Anonymous]

Thanks everybody, 

Please find the .f3g file attatched.

https://www.dropbox.com/s/cgw2jivjq5yl2k6/3d%20box%20v1%20v1.f3d?dl=0

I really appreciate the help. I reckon lines will be most suitable because I have precise dimensions for each edge:

Superior Length 10; Thickness 3; Inferior Length 12.4; Thickness 2.8; Temporal (left side/face) Length 10.3; Thickness 2.4; Nasal Length (right side/face) 8.6; Thickness 1.9.

The thickness has been measured by applying a ruler. Another schematic example is here:

https://www.dropbox.com/s/47vhtsb3uldj66s/IMG-20160210-WA0001.jpg?dl=0

a - left face/side length

b - right face/side length

c - superior face/side length

d - inferior face/side lengeth

etc.

I am happy to screenshare and do anything as long as that's convenient.

Best wishes

J

[TrippyLighting · Accepted solution]

Attached is a version of your 3D box created entirely with 2 construction planes, sketches and finally a loft.

All dimensions are parameters, which can be  accessed ancd changed in "Modify -> Change parameters".

I first made a side view sketch with parameters a-b-c-d. Based on your sketch the box is not completely asymmetic but has one symmetry plane shown as  dotted/dashed lines in your sketch.

If that's not the case you sketch is underdefined and needs to have a numer of constraints/angles added.

I then created the g-e sketch on an existing (origin) plane.

The first construction plane only serves to be able to creat teh second one. Teh first constriion plane is a plane through two edge, which are edges g & c. The construction line in that sketch only serves as a reference for the second construction plane, which is also a plane through 2 edge. The constrction line in the previous sketch and edge b.

Then I created the  H-f sketch.

See if you can make sense of it.

[Anonymous · Accepted solution]

You had it.  You just needed to finish the loft  (linked)

Volume is 340mm3 from your sketch.

Couple things I noticed,  first the copy to clipboard on solid-rmb-properties didn't actually copy anything to my clipboard.  (bug?)

Second: there doesn't appear to be a way to dimension 3d sketch objects.  That would be really nice to have. (feature?)

[Anonymous]

I really appreciate all the help, guys!

The modify > dimensions feature was really handy. Thank you for putting the time into this. It is a very important project to me. I am very grateful! 

Best wishes

J

[TrippyLighting]

@Anonymous Yes, I believe that non-functional copy is a bug.