[Click on the headline above to see the entire photo gallery]
I had the great pleasure this last Saturday of attending the Young Makers program at the Exploratorium. The theme of the month was Time… and what a great time we had. You can watch a webcast of the Meet the Makers portion of the day here.
Here Are Some Highlights:
David Forbes – Nixie Watch
“The perfect way to show your retro-geek cred”/Atomic Nixie Clock /Oscilloscope Clocks (plus he’ll show his video coat-turned-video-vest – things went a little haywire at Burning Man)
One of my favorite activities was the Stroboscope that has found a permanent home on the floor of the Exploratorium. If you have wanted your own, you can find the details in MAKE magazine Volume 24
Messing about with Numeric Displays
A table was set up with all the pins of a giant seven segment display. With jumper wires, kids (and kids at heart) could turn on all the segments and learn how the display worked. I saw kids trying to spell letters and even put a few together for small words.
The next event is Saturday, March 17, 2012 and will feature Tools. Bring your friends, bring your families, have a blast with your kids.
The highlight of the day for me was watching my son watch the Android zoetrope spin round and round. He just squealed with delight at the animated characters. What is your favorite memory of the Exploratorium?
Open MAKE is a collaboration between the Exploratorium, MAKE magazine, and Pixar Animation Studios. If you’re a fan of Maker Faire, you won’t want to miss these tasty tasty samples of Maker Faire organized by our friends at the Exploratorium. The event is included in the price of the museum’s general admission and open to everyone.
I’ve written before about some of the cool applications of silicone polymers we’re seeing in consumer products these days. Here’s another example. The good folks at Rockler Woodworking & Hardware just sent me a couple of their new (ish) Silicone Glue Brushes, a clever idea for the shop I imagine got started when some enterprising carpenter appropriated a silicone pastry, or basting-brush, from the kitchen for glue-up work.
Apart from the small paddle at the other end of the handle, this is very similar to the cooking tool, but cheaper (at $4 apiece) than most of the “food grade” brushes I’ve seen online. Also, the bristles are bit thicker and more widely spaced than those on my silicone basting brush, which only makes sense for a brush designed to work with thicker liquids.
Rockler’s glue brush is 7.5″ overall and weighs 3/4 oz. The soft black silicone head, which pops off the blue rigid polymer handle, is 1″ wide by 11/16″ thick, with 49 bristles in an hexagonal grid. Each bristle is 1/16″ in diameter, and the face of the brush is slanted, with the shortest bristles about 1/4″ and the longest about 1/2″.
I first tested mine against Titebond II Premium, which is a fairly typical polyvinyl acetate-based wood glue. You can clean it up wet, of course, like a regular brush, by running it under hot water, but the real value of silicone becomes evident when you just let the glue dry into a blob on the brush. Unlike a natural or synthetic fiber brush, the solidified mass of glue doesn’t stick in the silicone bristles: just flex them a bit, and the dried glue falls off and/or pulls out in a single clump. I didn’t get a chance to test this, but Rockler’s advertising copy claims even fully-cured polyurethane construction adhesive (like Liquid Nails) just “cracks and peels right off the bristles.”
If, like me, you use disposable foam brushes to save clean-up time, a silicone brush can be a more environmentally responsible, and in the long run, probably cheaper option. You can essentially use it like a disposable brush, except instead of throwing away the whole thing, you just throw away the blob of dried glue.
Curious about non-glue uses, I also experimented with using the brush to apply latex paint. As you can see, the bristles are really too thick to give even coverage, causing visible streaks. It’s worth noting, however, that the amount of streaking varies with the substrate (plexiglass streaks much worse than plywood) and with the thickness of the paint. On the right material, with properly thinned paint (and maybe thinner bristles) a good paintbrush could be made from this stuff, too.
My latex paint sample wasn’t completely dry as of this writing, but I will post an update about how well it cleans up as soon as it is. I also have an ongoing test with two-part epoxy and am planning another with cyanoacrylate, all results TBA. I’m determined to find something that will ruin this brush!
The embedded video is a collection of soundbytes that give a good general background of the Glove-TalkII system from Sidney S. Fels and Geoffrey E. Hinton.at The University of British Columbia. But the brief samples of the system in operation that it includes are, frankly, not a great advertisement for its capabilities or its potential. The best videos don’t seem to be available as embeds, yet, and to really appreciate how Glove-TalkII works, I recommend following this link to download a short AVI clip from the project homepage, showing operator Sageev Oore “singing” the alphabet song using hand gestures.
As with a Theremin, pitch is controlled by hand position in space. Closed-finger gestures, with one hand, create voiced consonant sounds, while open-finger gestures with the same hand give sustained vowel sounds. Hard stops, like “puh” and “buh” and “tuh,” are controlled with the fingers of the opposite hand. Looks like lots and lots of fun. [Thanks, Laura!]
DSO Nano v2.0, from the Maker Shed, is a pocket sized Digital Storage Oscilloscope designed for basic electronic engineering tasks. The DSO features an ARM Cortex™-M3 32 bit platform which provides basic waveform monitoring. It has a 320*240 color LCD, micro SD card storage, portable probes, LiPo Battery, USB connection, and signal generator. Perfect for in-field diagnostics, quick measurement, and hobbyist projects. Of course, this doesn’t have all the features of a bench top ‘scope but it sure will take up less room!
- Portable and lightweight
- Color display
- Waveform storage and playback
- 6 triggering mode
- 1Mhz Analog Bandwidth
- Complete measurement markers and signal characteristic
- Built-in Signal Generator
- Accessories available
- Open Source
Refurbishing old scientific and industrial equipment from eBay is something I love to do. If you understand what you’re looking for and are a savvy eBay user, you can score some amazing bargains on stuff that just a few years back was high-end, cutting edge, extremely expensive research-, factory-, and/or military-grade equipment. Garage quantum physicist (no, I’m not kidding) David Prutchi definitely has the knack, as witnessed, a couple weeks back, by his method for hacking a military surplus fallout probe into a general purpose, broad-spectrum high energy ionizing radiation detector.
This week, David has done it again with this excellent guide to building your own atomic clock from a used rubidium oscillator:
Efratom Model M-100 Rubidium Frequency Standard (RFS) oscillators are widely available in the surplus market. Units on eBay commonly sell in the $150 to $200 range. Despite their low surplus price, they were originally very expensive components, with superb performance. The M100 was designed to be used by the military as a master oscillator in high-performance communication systems, frequency standard equipment, advanced navigation equipment, and all other systems which require extremely precise frequencies and time intervals.
With the proper input power provided and suitable cooling provisions, you can turn a surplus M-100 into a free-standing 10 MHz +/-5×10-11 frequency standard for frequency counters, as well as a precise calibration source. I use mine to keep precise track of frequency when working on Earth-Moon-Earth (EME) communications, where even tiny errors in tuning can make the difference between success and failure to receive weak echoes.