Saturday, May 7, 2011

Making of the Rice Athenian Owl earrings

Hi, everyone. Just thought I'd show everyone how I made the Rice Athenian Owl (RAO) earrings. If you want to make your own, I'm not going to stop you, but why not just buy from me? =D

Find a picture of the Rice Athenian Owl. The Rice Athenian Owl logo has changed over time. The most recent one is the simplest. I used a more dated one that has more complex wings/feathers.

Edit in a vector-based illustration program like Adobe Illustrator. You can't just take the RAO logo, shrink it, and expect to laser-cut it well. Many points of the RAO logo need to be adjusted. A lot of edges need to be thickened up for laser-cutting. Also, the eyes need to be tweaked - in the RAO logo, the eyes are just floating crescents. To cut something out of plastic, you need the entire thing to be one continuous shape.

Finding the right material. I browsed online for material properties of various types of sheep plastic (PVC, styrene, nylon, acrylic, etc.). I knew I didn't want the earrings to be any thicker than 1/16" inch. I used 1/16" sheets of styrene, acrylic, and nylon for testing.

Testing. Because of the delicate nature of these earrings, they have for be cut pretty slow. Even if you turn up the speed on the laser-cutter, the sharp angles and intricate curves of the RAO shape force the laser spot to hang around any given area for a relatively long time. The heat buildup will cause surrounding material to melt. This was the case for acrylic. Styrene wasn't as bad, but it produced a lot of stringy-melted-plastic (like when you hot-glue something and there's that spider-silk-esque line of plastic). For me, nylon had the best performance. I had a hunch that nylon would perform well, since material spec sheets said it had the highest heat resistance.

Many failed test-cuttings...


This one had it's feet melted rather than cut...


Editing the picture again. When you're cutting, you'll find some parts of the earring will cut better than others. I had to go back and tweak the RAO image several times to minimize melting and breaking.

Cutting. Once you've got the right picture, material, and laser-cutting settings, it's time to cut the material!

Here are a bunch of freshly laser-cut pieces:


It just looks like a solid owl silhouette. That's because laser-cutters (probably) aren't made to make these tiny cuts on such delicate parts. A lot of the shapes that are supposed to be cut out have been melted and are still attached the main part. Even after tweaking the laser settings, this is the best I could do...

Cleaning. With an exacto knife. Very, very tedious. Other than testing, this is the most time-consuming step. Basically, you got to separate all the parts that the laser cutter was supposed to cut but melted instead. Obviously, the less detail the part has, the better the laser-cutter made the cut. For simple shapes like the holes around the eyes, basically you just need to poke those parts through. For the feet of the owl (that I'm shown cutting/cleaning below), that part is kind of a bitch. Fortunately, the nylon material has such great tensile strength properties and is rather flexible.


Still, you gotta be careful when cleaning. Some parts of the earrings are very thin. I think the thinnest point on mine is around a third of a millimeter.


After cleaning the main parts off, there's still a lot to do. Since the laser spot can cause local melting, you gotta scrape off those "globs" of material to make the shape as smooth as possible.

Aftermath of cleaning...


But after cleaning, you get a bunch of nice, pretty owls, ready to be painted!


Painting. This is the easy part. Go grab a can of your favorite color of spray paint and spray these babies down! I picked a bright metallic (kind of) silver because I really wanted them to stand out. I think they'd look especially good on a background of dark hair because of the contrast.


Assembly. Go to your favorite craft store (Hobby Lobby, Michaels, Joanns, Texas Art Supply, etc.) and find their jewelry department. Find some hooks and start assembling! If you don't already have one, get a set of jewelry pliers from the craft store - it'll make the assembly process much easier.

And there we go...a completed set of Rice Athenian Owl earrings!


So, if you're a Rice girl who's graduating or know someone who is, hope on over to: http://www.facebook.com/event.php?eid=143827832357034 to find out how you can buy a pair! As of now, I've only made 12 pairs, so hurry and order!

Monday, April 25, 2011

Hello, FORTRAN, my old friend

Here's the parody I performed with my friend, Kristie, at the ChBE Banquet. I first wrote this back when I was in 305. I appended it to the back of my Homework #3. Anyways, here are the lyrics. If anyone has a recording, please send to me, and I can post it here. KZ has requested a recording, which I might do with Kristie later if we have time.

Enjoy!


Hello FORTRAN, my old friend
I’ve come to code with you again.
Because whenever I use MATLAB,
I’m confined to a computer lab.
Thank goodness for the free, personal edition,
It frees me from,
SDL; it’s a prison

So I start writing line one
With your helpful IMPLICIT NONE.
So I don’t mean to make variables
Because of my careless typos.
But my code, like a faulty engine crashes,
Burns into ashes.
Looks like, it’s a night of Three-oh-five.

In restless dreams I code away,
Hunched over my laptop all day.
Finding roots using Bisection.
It’s too slow, so I use Newton-Raphson.
But my root, it diverges into Hell,
And so I yell:
Looks like, it’s a night of Three-oh-five

And next morning in class, I saw
Maybe 5 people, but no more
Hear the lecture, KZ might reach you
Read this code that he might teach you
But our eyelids, like heavy anvils fell,
We pulled all-nighters
Last night for Three-oh-five

And the students bowed and prayed
To their lab session TAs
We were already on week four.
Homework 2 was still on Charles’s floor.
And on OWLSPACE KZ has posted the next problem set,
He won’t relent.
Here comes, another week of Three-oh-five…