Making Masks At Home
By Frederick Ernst
Due to the coronavirus, it can be difficult to find masks in stores or on-line. CDC recommends the wearing of a mask when outside the home and when it’s difficult to remain 6 ft away from others in order to contain the microdroplets that can potentially carry the coronavirus. It’s important that we not buy and hoard the N95 masks that medical workers need right now. However, the City of Los Angeles has issued a requirement that all residents should wear a mask when outside the home, particularly when inside stores or other facilities. Luckily, you can create your own mask at home. Here are some various ways to do so.
One way to create a face mask is to make it out of a t-shirt. For this mask you will need a shirt made of tightly knit cotton material and 2 rubber bands or hair ties. In order to make this mask, first, cut off the bottom seven to eight inches off the t-shirt so you have a strip of material, lay it flat and turn it 90 degrees so what used to be the hem of the shirt which is usually double stitched, is facing left or right. Then, fold the top of the strip to the middle, and fold the bottom of the strip to the middle and repeat one more time. Loop one rubber band over each side (left and right) so it looks like a candy wrapper. Then fold the excess material on the right and left to the middle. Put a band over each ear, making sure the material fits snuggly on your face. Watch the tutorial here:
Another way to make a mask is to use a bandanna and a coffee filter. For this way of making a mask, you will need a bandanna, coffee filter, and 2 rubber bands. To make this mask, fold the bandanna in half. Fold the filter horizontally in half. Take the wider section of the filter and place it in the middle of the bandanna, and then fold the top and bottom of the bandanna. Repeat folding the top and bottom one more time. Loop a rubber band or a hair tie on the bandanna at the left and right side and then fold the parts of the bandanna over the rubber band that stick off over the band. Then, put one band over each ear. Watch the tutorial to see how:
One more way to create a face mask is to sew one. For this face mask, you will need 2 ten by six inch rectangles made from tightly woven cotton fabric, 2 six inch pieces of elastic or rubber bands, cloth strips, string, hair ties. You also will require a sewing machine, a needle, and thread. To assemble this mask, first, stack the two pieces of cotton fabric on top of each other, and then fold the longer 10 inch sides a quarter inch down and sew them together. Then, fold the shorter 6-inch side a half inch down and sew at the edge leaving a small space to loop the elastic in. Thread the elastic in the opening you made. Then tie the ends together. Tuck the knots into the opening. Then, gather the short sides together and sew the elastic into place, as shown below.
by Suren Grigorian and Daniel Svediani
The name of Rube Goldberg has become synonymous with the word “mechanism,” with his machines connoting images of complex chain reactions which accomplish a minor and relatively routine task at their end. However, the development of these machines began upon the drawing board, as the original Rube Goldberg developed a reputation for these devices through his artistic precocity.
Rube Goldberg, known originally as Reuben Lucius Goldberg, was born on July 4, 1883, to a San Francisco police and fire commissioner and a member of a Reform Jewish congregation. During his childhood, he displayed remarkable talent in the tracing of illustrations. As he grew up, his inclination toward the arts became apparent, but he was encouraged on a path of engineering by his father, graduating from the University of California, Berkeley in 1904. However, his presence in the engineering community did not last long, as he decided to pursue his original inclination for the arts. He joined the San Francisco Chronicle and the San Francisco Bulletin, gaining cartoon syndication with several newspapers.
By 1915, he became known as America’s most popular cartoonist. His most popular comic strip was The Inventions of Professor Lucifer Gorganzola, which brought him fame and is the one that we all associate with Rube Goldberg. The strip exhibited comically intricate inventions created by a Professor Butts, and these devices would later become known as Rube Goldberg machines. Later, he created a series of seven short animated films depicting the humorous aspects of everyday life.
Check out the awesome student-made Rube Goldberg machine shorts from Mr. Bradfield’s MakerSpace classes in the attached compilation above!
Original Rube Goldberg cartoons:
Born in Nancy, France on June 26, 1725, Joseph Ducreux may have trained with his father, who was also a painter. He went to Paris to be taught by the famous pastel artist, Maurice Quentin de La Tour. When the French Revolution broke out, he fled to England. Here, he made the last portrait ever of King Louis XVI before the king’s execution.
Joseph is most famous for his uncanny self portraits, many of which were of him in odd and funny positions. He made these self portraits in the 1780s and 1790s. He also made many typical-style portraits of kings and queens as well as other influential people, including Marie Antoinette, King Louis XVI, Maria Theresa of Austria, and many more.
Ducreux would resurge in popularity when his most famous self-portrait, below, entitled “Portrait de l’artiste sous les traits d’un moqueur” (Portrait of the Artist with the Traits of a Mocker) was turned into an internet meme.
Do you have a suggestion for an Artist of the Week? Message Ms. Kincaid with your ideas.Read More
Thank you to all who submitted captions and to those who voted. The winner was submitted by Leah Rosenthal, Gr. 10.
The correct answer is 43.
The first 3 students who got it right are: Taemin Han, Hanwen Huang and Mark Luo. Congratulations and look for your prize in your in-box soon!
How do you arrive at 43? Well, for one thing, you got to look very carefully at the pictures.
Here’s a breakdown using emojis for the boy, the shoes, and the cones of — what is that? Spinach? Black rice? Charcoal? 🤷
5/12 Math Teaser
Think you know the answer? The first three correct answers will win a very special prize. I’m sure we have something left over from Halloween…
by Ms. Kincaid and David Tang
I’m sure there are many of us who read about what’s happening in the news and see how hard healthcare and frontline workers are working to keep us safe, and we wonder, “What can I do to help?” Well, 8th grader Zyg Ramsay went ahead and decided to do something about it. He saw the challenges that healthcare workers were having getting all the Personal Protective Equipment, or PPE, they needed. With a highly contagious virus like SARS-CoV-2, doctors, nurses and others must have not only masks and full gowns, but also face shields to prevent the microdroplets that could carry the virus from coming in contact with their faces. Zyg saw that Budmen Industries was looking for volunteers to help flatten the curve and protect healthcare workers by using their home 3D printers to print these face shields.
As he explains, “I was fiddling around on the internet and found the Budmen website that contains 3D printing files. You register to become a producer. They didn’t tell me what to do so I just printed one to see how it worked. I thought, “Once they email me to start printing stuff I will.” I got an email from Budmen saying there was an L.A. location, with somebody putting it together in the L.A. area, so I signed up for that. I didn’t have to design the file; you don’t code the printer’s movements, there’s a program that takes a 3D image and converts it into text which the printer follows.”
MS KINCAID: What material do you use to print the face shields?
ZYG: I use PLA [polylactic acid] for the face shields, which is a plastic made from corn, so it is biodegradable. My printer melts it at 200⁰ C and prints each of the 30 layers layer by layer, printing a complete face shield in 2 hours. There are two things I print for it. One is the actual shield in front of the face, and the other is the strap lock that keeps the elastic in place.
MS KINCAID: About much does it cost to make each one?
ZYG: I calculated it at one point, I think it’s around 12¢ of material for each one. I’ve printed 59 shields, so almost 3 kg of plastic.
I asked Zyg how he got into 3D printing. “About 2 years ago, I read about 3D printing in MAKE: magazine. My first printer cost around $200, but it was only able to print up to 4 cubic inches. I got a larger one for Christmas that can print up to 11 cubic inches.”
Our interview continued:
MS KINCAID: What else are you working on?
ZYG: Right now I’m working on making two drones. One is a tricopter with three propellers and servo motors to turn the propellers. From what I have read, it’s is much more stable and easier to control, but for some reason it’s less common than the quadcopter, the normal drone with a
MS KINCAID: Why do you think that the tricopter is better than the quadcopter?
ZYG: The tricopter doesn’t turn by slowing down one propeller and speeding another like the quadcopter, it turns the servo. It also doesn’t lean when it moves to the side, it stays in place, which helps people with cameras on their drones.
I’m also working on a minor soldering project. My mom bought a PCB for me, which is a superthin circuit board, and I solder super tiny electronic pieces onto the PCB with solder, which is just super easy-to-melt metal that conducts electricity.
MS KINCAID: Are you just experimenting to see if you can solder that small or are you actually trying to modify the board?
ZYG: I’m just trying to solder that small. Usually I solder bigger things but it has the soldering pads to attach components to it. The last project I’m working on is my MakerSpace project, which is the prosthetic hand controlled by muscle signals.
MS KINCAID: Can you tell us about that?
ZYG: Basically it works with 5 servos connected to string that attaches to each of the 3D printed fingers. When the servo turns one way, the finger closes, and when the servo turns the other way, the finger opens. I control it using muscle signals with a control board connected to a microcontroller like an Arduino. The part connected to the muscle uses EMG [electromyography] to measure difference in electricity between different points on the arm. It uses this EMG to figure out if the person is trying to flex or relax. This works because muscles use actin and myosin fibers, triggered by electrical impulses and powered by ATP.
MS KINCAID: What is your goal?
ZYG: I want to make a very cheap prosthetic hand where you can move each finger independent of each other. Right now your options are: a cheap one that closes all fingers at a time, which is bad for writing or holding circular objects, or an independent-digit expensive hand for around $10,000. Mine would be $150-200 but with independent digits. I would want to program patterns into it for set hand positions because it’s hard to program in each muscle.
MS KINCAID: If this is meant for someone without those muscles? Where would the signals come from?
ZYG: Right now, I control it via my forearm. This is designed for somebody who has no wrist, but still retains most of the forearm, so you can still use the muscles of the forearm. Closing and opening the hand uses muscles in the forearm, not the hand or wrist. Just using the forearm is a bit harder, but you can learn to do it. Studies have shown that with training, you can learn to use your brain to control a whole prosthetic arm.
MS KINCAID: That is cool! Would the stickers with wire be attached to your temples, then?
ZYG: You wouldn’t use the stickers, you would use the headset that goes over your head and measures alpha brain waves. You can’t really control an arm with that outside of the lab because you would have to get something implanted in your brain to control the arm, and you can’t do that outside of the laboratory.
MS KINCAID: So I guess that’s where we are today, and we’ll keep moving forward with the technology. Thanks Zyg, I feel like I learned a lot today!
ZYG: Thanks, you too! Bye!
As Mr. Bradfield, Zyg’s MakerSpace teacher commented, “It was inspiring to see Zyg applying the design and engineering principles he learned in class to a real-world problem.” It is inspiring to see our students take what they learn and help make the world a little bit better!
If you are interested in registering to 3D print face shields, learn more by clicking below:
How 3D Printers Work
By: Suren Grigorian and Everett Lane
3D printing is a technology which, prior to the beginning of the 21st century, remained exclusively confined to the subjects of industrial manufacturing and prototype production. It is gaining traction in the consumer/recreational world as one of the most ubiquitous and recent technologies of the early millennium; however, a large majority of those who do not have experience with 3D printing remain unclear as to what it entails. 3D printing, to clarify, is primarily defined as a set of technologies capable of depositing the semi-liquid or solid form of a particular material, normally various types of plastic, to form a 3-dimensional shape based upon a digital design; 3D printers are named as such due to their ability to print an item within 3 dimensions via extrusion, similarly to how a standard printer extrudes ink to form a 2-dimensional image. 3D printers possess commercial and industrial variations, whereby commercial 3D printers primarily exist within the form of either material extrusion printers or powder bed fusion printers; the first of these types utilizes the aforementioned process of extruding a select quantity of material via a nozzle similar to that of a standard printer, allowing the device to construct an item, layer by layer, along previously established lines from a digital model. This type, additionally known as fused deposition modeling, remains particularly common, as it occupies the largest portion of the commercial 3D printing market today; this is a direct result of its relatively small cost.
The second type of standard commercial 3D printer remains the powder bed fusion type; this type is primarily characterized via a mechanism which, rather than processing and extruding material from a separate store, utilizes concentrated lasers to melt, solidify and fuse a bed of powdered material, normally polyamide plastic, into a final shape. As each fusion cycle is completed, a roller contributes additional material and the cycle begins once more; this type primarily consists of selective laser sintering, patented at the Defense Advanced Research Projects Agency in the 1980s and today the most common type. The objects produced by both types additionally possess varying textures, with the former producing granulated, coarse items and the latter producing smooth, layered and ribbed items; though texture varies, the primary factor which leads the average hobbyist to select one over the other is cost, as powder bed fusion 3D printers are more expensive than the standard fused deposition modeling types.
But what of industrial 3D printers? These 3D printers are primarily characterized via the utilization of technologies which served as the ancestors to the modern 3D printer. Some types of filaments for 3D printing are PLA and ABS, but in this case polymer will be used. These 3D printers usually make their product with a pool of liquid. This is called Stereolithography. First, a roller on the printer spreads out an extremely thin layer of liquid polymer on a platform. Since the layer is a liquid, it will spread out across the entire platform with an even distribution so each layer will have a consistent thickness. The liquid polymer is specially designed to be UV sensitive, so when it is struck with a UV laser it solidifies. Essentially the laser bra is the outlines of the build onto the platform and the places that the laser touch garden. Then the roller rolls a new layer of polymer onto the platform and the platform shifts downwards to facilitate the new layer that has been added to the platform. The process gets repeated over and over again until the build is completed. Then it lifts the newly lasered plastic up out of the resin and the remaining flows away to be used in other builds.
|Can be printed on a non-heated surface||Can deform because of heat||Very sturdy and hard||More damaging to the environment.|
|Smells sweet when being printed||Less sturdy than ABS||Suitable for cars and machine parts||Needs to be printed on a heated surface.|
|More environmentally friendly||Higher melting point||Releases plastic fumes when printing.|
|Higher printing speed||Longer lifespan||More difficult to print.|
|A lot more detail||Not suitable for using with food.|
So, after looking at this chart you can tell that if you are a recreational printer, you should go with PLA. But, if you are in a more high tech industry, ABS is the way to go. One more thing: The type of printer used has a great effect on the quality of the print. For example, if you have a budget of $200-$300 you would not be able to purchase the highest quality printer. But if your budget is $500-$1000 then you can dive into the field of serious 3D printing. The speed of the printing also affects the quality. If you’re willing to wait, you will get a better finished product of your work.
So, as you might have heard already there have been some breakthroughs achieved in the field of 3D printing organic matter. For example, there have been confirmed reports of 3D printed skin made with an organic printer that has already been used in transplants and large wounds. 3D printing can also be used in transplants because it is so easy to make but it is still being developed.
There are also many advantages to having a 3D printed body. Part of that is because it is easier to make than other alternatives. Companies such as Organovo, or Biobots have been doing and researching these alternatives for years. So don’t expect for this to come out for even private use for a while!
3D printing software is important when making something to be 3D printed.. Some people can get the best filament and 3D printer but forget that there is no way to print anything without an engine to print through! Some types of software are Fusion 360 Autodesk, TinkerCAD, and OpenSCAD. (Information from https://all3dp.com/1/best-free-3d-printing-software-3d-printer-program/)
|Name||Function||Difficulty level (To operate)||Platforms|
|Cura||Slicer, 3D printing Host||Beginner||Windows, Mac, Linux|
|Matter Control 2.0||STL Editor, STL Repair, Cutter, 3D Printing Host||Beginner||Windows, Mac, Ubuntu, Raspberry Pi|
|Astroprint||Slicer, 3D printer host||Beginner||Browser|
|FreeCAD||Design||Intermediate||Windows, Mac, Linux|
|OpenSCAD||Design||Intermediate||Windows, Mac, Linux|
|OctoPrint||Cutter, 3D Printer Host||Intermediate||Windows, Mac, Linux, Rasbian|
|Meshmixer||STL Editor, STL Repair||Intermediate||Windows, Mac|
|MakePrintable||STL Editor, STL Repair||Intermediate||Browser|
|Netfabb||STL Repair, Cutter||Professional||Windows|
|MeshLab||Editor, STL Repair||Professional||Windows, Mac, Linux|
|Blender||Blender||Professional||Windows, Mac, Linux|
Here are some of the many applications of 3D printing:
And now, with the many challenges of having sufficient equipment to handle the caseload of the COVID-19 pandemic, some intrepid printers are modifying existing ventilators with a 3D printed part called a Y-splitter, which can help stretch the capabilities of the world’s limited supply of ventilators by dividing the air flow from a single ventilator to multiple patients. See article below:Read More