Here's One For You Guys - Buckminsterfullerene

[quick61]

Here is my first take on modeling a Buckminsterfullerene, AKA Bucky-Ball. I did this by starting out with 3 golden rectangles used to construct an Icosahedron and going from there.

I'm thinking that I have gone the long way around about making this thing and am wondering if anyone here might have a different take on how to simplify the model? File Attached.

BuckyBall.png (44.65 KiB) Viewed 2218 times

Buckminsterfullerene.fcstd

(164.32 KiB) Downloaded 50 times

Edit: New file, cleaned up a bit - organized the Tree.

Mark

OS: Ubuntu 14.04.1 LTS
Word size: 64-bit
Version: 0.15.3866 (Git)
Branch: master
Hash: 1f162dec2d9999f169a065121e296849a4a8f6f1
Python version: 2.7.6
Qt version: 4.8.6
Coin version: 4.0.0a
SoQt version: 1.6.0a
OCC version: 6.7.1

[ulrich1a]

I made a Bucky-Ball with one sketch. The tricky part is to make a sketch of a projection of the Bucky-Ball. The rest is then not so hard:
- Pad the sketch with a sufficient length.
- make clones of the Pad
- rotate each clone, so each clone is aligned to one of the symmetry-axes.
- make a fusion of all.

Have a look here: viewtopic.php?f=24&t=7157

With the aproppriate sketch, you will get a parametric model.

Ulrich

[quick61]

Thanks for the link, nice.

The tricky part is to make a sketch of a projection of the Bucky-Ball.

Yes, and if you don't have one? I should of looked for a .step bucky-ball file. That's a slick way to go about it.

Mark

[ulrich1a]

I should of looked for a .step bucky-ball file. That's a slick way to go about it.

That is not true. It does not give you the freedom of selecting the size. I like it, that there are a lot of ways to make something with FreeCAD and you managed another approach, which has its merits.

Ulrich

[quick61]

The one thing I ran into, (again), when doing this model is wishing that Draft > Line had a way to define a line length. It would of done away with all those sketches.

To anyone - Is there a way to make the Trim/Extend tool in Draft to trim along it's current path? I tried most every way I could think of to get the tool to behave, but the line wanted to go every which way BUT along it's current path. If I could of gotten the tool to behave the way I wanted, I could of trimmed the lines making up the Icosahedron and done away with the sketches that way.

Maybe a feature request for Draft > Trim/Extend > Trim/Extend along current path switch?

Mark

[yorik]

Do you mean trim/extend with itself? Indeed I never thought about that curiously Please open a ticket!

[quick61]

Do you mean trim/extend with itself? Indeed I never thought about that curiously Please open a ticket!

OK, I will just as soon as i get Mantas working. Currently I am getting an error message at the bottom of the page.

Code: Select all

SYSTEM WARNING: 'Unknown: write failed: Disk quota exceeded (122)' in 'Unknown' line 0

SYSTEM WARNING: 'Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/home/freecadweb/tmp)' in 'Unknown' line 0

Edit - Sense I'll reference this thread when Mantas is working again, I'll post this now.

I think were talking about the same thing Yorik. In Draft, start a line at 0,0,0 and end at 50,50,50. Once the line is made, invoke the Trim / Extend tool and try to trim the line to 40,40,40 or extend it to 60,60,60. The line will not trim or extend along it's current path, or at least I have not figured out how to do so yet.

I've come up against this several times in the past and having a feature that would allow a keyboard shortcut or a checkbox to allow this type of trim / extend would be most welcome.

Mark

[quick61]

Forum and Mantas are back on line.

Feature request filed - issue #1687

Mark