[Michael Peshkin] teaches mechanical engineering at Northwestern University. He likes to use diagrams to illustrate his point, but he also likes to face his students when doing so. His solution was to develop this clear whiteboard which ends up unlocking a lot more than just some hand-drawn schematics.
It’s a bit hard to see what he’s written on the board in the image above but squint and see if you can figure out what’s wrong with this style of teaching? Everything he’s writing is backwards. That’s not actually a problem in this case as [Michael] uses flip teaching. He records and posts all of his lectures online. Classroom time is then used for question and answer on the lecture subjects. In order to get the text to read the correct way he just bounces the camera off of a mirror.
The board itself is a huge sheet of tempered glass attached to the metal frame using bolts through holes in the pane. This leave the edges free. He added extruded rail to the top and bottom to embed strips of LEDs. They light the inside of the glass, and excite the fluorescent dry erase marker ink making it much more visible. [Michael] didn’t stop with the board, he also rigged up a lighting system that gives him a lot of options, and uses a monitor for dealing with digital overlays. He can put up a diagram on the computer, watching the monitor to see where his marker is making annotations. All this happens in real-time which means no post production! See a demo of these features after the break.
This could all be done without the glass at all, but that would make it quite a bit more difficult for the person doing the writing.
Continue reading “Building a Crystal Clear Whiteboard”
Signmaking today isn’t what it once was. Where today a few vinyl letters stuck to a piece of plate glass is good enough for any storefront, there was a time when the signs in front of businesses were works of art involving many skills and dozens of tradesmen to create. [David Smith] is one of the last remaining old-school signmakers, and his creations are just as beautiful as the finely crafted signs of a century ago.
The techniques [David] uses to create his signs are as varied as the finished products are elegant. He cuts patterned grooves into glass with wheels made of diamond or ceramic and bends shaped glass over forms in a very large kiln.
Aside from cutting, shaping, and grinding glass, [David] also paints his signs – on the back side in reverse, building up his design layer by layer. The very first layer in some of his designs are gold leaf, a difficult material but [David] invented his own leaf applicator that makes the job much easier.
Truly amazing works of art, and certainly much more elegant than whatever plastic nonsense goes as proper signmaking these days.
Continue reading “Signmaking in glass and gold”
This lantern was built from recyclable goods. It’s a bit dangerous when used like the image above, but [The Green Gentleman] does give you a few other options in his build instructions which make for much safer operation.
The lantern enclosure is made from old cans and a glass jar. He screwed a couple of boards together at a right angle to act as a jig for cutting the glass. The V-shape created by the boards holds the jar on its side, giving his glass cutting tool something to rest upon. He then turns the jar to score it around the top, and then bottom. He alternated pouring boiling and chilled water on the score mark to shock the glass into breaking along the line.
This makes up the clear part of the enclosure which is later mated with metal top and bottom pieces. From there he adds either an LED, an alcohol lamp, or the Trimethyl Borate lamp seen above. The first two are relatively safe, but the latter burns at around 1500 degrees F. We have reservations about using a plain old glass jar as the enclosure for something burning this hot. It really should be heat resistant glass.
[Andreas Hölldorfer] brings his light fixtures into this century by using a couple of modern technologies. The fixtures combine LED modules, 3D printed pieces, and laboratory glassware to give his room a unique look.
The glass enclosure is something he’s had on hand for quite some time but they never actually got used. There is an opening at one end which is meant to receive a stopper. He modeled one including holes for the wires and printed the piece with a 3D printer. Also fabricated in the same way is a bracket that is used for mounting the fixture to the wall. The blossom of components inside the glass are each made up of five LED modules. There’s no word on what he’s using for a power supply or how he managed the cable runs, but he did post an image of two of the fixtures installed in his living room.
Members of the Warp Zone hackerspace wanted a coffee table that was beyond ordinary. They ended up pouring a concrete base for the glass top (translated). There were several things to address during the design. First off, they wanted to integrate LEDs in the concrete sides. Some consideration had to be made for portability as concrete is very heavy. The final piece of the puzzle was deciding what kind of hardware to place beneath the frosted glass.
The legs were designed with a large cut-out area to keep them as light weight as possible. The cross piece has a set of voids spelling out the name of the hackerspace with some green LEDs. This was accomplished by placing foam cut-outs of each letter in the forms before for concrete was poured. They sealed around each letter with silicone, but still had some seepage most likely caused when jostling the form to help remove air bubbles. Straws were placed in the foam to allow a cable pass through for the electronics. After everything was in place they filled the voids with hot glue to act as a diffuser.
There aren’t a lot of details about the RGB LEDs under the frosted glass. But you can see the light show they produce in the clip after the break.
Continue reading “A concrete table with a little blinky built in”
Even if you live in a dump this quick build will make your doorbell sound high-class. The new rig uses a crystal goblet to alert you of guests at the door. We suppose the room-silencing sound of flatware on a wine glass does make a great attention getter.
For [Tobias] the hardest part of the build was getting his wife to sign off on it. But he says the 1970’s era original was looking pretty shabby, which kind of made his argument for him. It took just two hours to develop and install the replacement. It uses a servo motor with an articulated striker to ping the glass which is hanging inverted between two pegs. The original AC transformer (which are most often 16V) was used to power the Arduino. He built a simple rectifier along with a big smoothing capacitor to make sure the Arduino doesn’t reset when voltage dips. Although it’s not mentioned in his comments, we’d bet the doorbell wire has been rerouted to connect directly to the Arduino, rather than remain patched into the power loop.
Don’t miss the clip after the break to hear how great this thing really does sound.
Continue reading “Crystal doorbell helps class up the joint”
From the look of it his is just another Word Clock, right? From the outside maybe. But if you take a look at the build photos this a good example of extreme fabrication.The design uses a five-layer lamination of glass bezel, vinyl lettering, diffuser, mounting plate, and back panel. The mounting and lettering layers were labor intensive, but are also the reason for the gorgeous finished look.
The bezel consists of black adhesive foil applied to the back of the glass faceplate. The letters were cut out using a vinyl cutter, and the lamination process happened in a pool of water. This technique helps to ensure that no fine particles end up between the glass and the foil.
The wooden mounting bracket was ordered from a local kitchen cabinet fabricator. It’s MDF that is 17.7″ and has been edge wrapped in glossy white PVC. Once it arrived, [Muris] started drilling the 248 holes and their counter sinks. This is on the front side of the layer and when sprayed with silver paint the countsinks act as reflectors. On the back side he milled groves to accept PCB strips to host the LEDs as well as the breakout boards that hold the MAX7219 drivers.
Don’t miss the video clip after the break that shows off the final product.
Continue reading “Incredible fabrication process makes this Word Clock stand out”