Workshop 88 led a workshop on 7/11/17 for the Winfield Public Library Young Adult Services called Science of Sound. The students built flutes (more like recorders) out of PVC tubing and pieces of wooden dowel. The flutes worked quite well, and the students had a good time.
There’s a LOT of information on the web about PVC flutes, up to and including some “flutomat” pages with interactive spreadsheets for finger hole placement. Who knew?
In preparing for the workshop by making a couple of flutes at home, it quickly became clear that it was often easier to get a flute to sound the first overtone than the fundamental we’d be shooting for. To set the stage for discussing that as the student flutes made their first noises, the presentation started out talking about natural vibration modes, with demos of guitar string harmonics, vibrating strips of metal, and a 15-foot “jumprope” with standing wave loops up to the 4th harmonic.
In discussions at W88 before the class, Rachel pointed out that decorating the flutes would be important to some students. Colorful duct tape, provided by both W88 and the library, proved that suggestion to be quite true, despite the stodgy old teacher never even considering it. Thankfully, we have a community to help rip off blinders!
Those discussions also resulted in scope creeping from the initial plan of just showing that drilling a hole or 2 could change the pitch of the flute. The final class version used a traditional six hole fingering scheme that played fairly well in tune into the second register – a few notes above an octave. Thanks to this flutomat for the hole spacings!
Andrew and Jim represented Workshop 88 at the Southland Mini Maker Faire in Mokena August 27th. That Faire is run by Jay Margalus, one of Workshop 88’s founders.
Andrew’s workshop for kids to create their own hand-dipped paint-film artworks was a big hit, with dozens of delighted artists taking home their masterpieces. Foam balls were the canvas; a bucket of water was the studio.
The technique, invented by Andrew using a film of spray paint on a tub of water, was inspired by a similar approach he’d seen using nail polish. Less-than-perfect results with the polish caused him to test and perfect the paint approach. Results were spectacular.
The laser toys box was there, as usual, and its Escher lizards provided entertainment and education for many little (and not-so little!) hands. Having the back sides of the laser-cut pieces engraved with three different patterns provided an additional level of challenge based on the 3-way tessellation as a 3 color map problem. The laser engraved wording on what used to be the bottom of the tray used to be obscured by the toys. With the addition of the new slightly smaller lower box, that old tray is now both a useful top cover and a convenient display card!
Jim’s UV-lit fluorescent non-round gears caused lots of folks to stop and take a look. Their graceful turning, speeding up, slowing down, reversing and repeating mesmerized a few visitors. Their stepper controller and Tiny85 processor mostly worked, but required some discreet wiggling several times to keep it all going. The flaky solderless breadboard that hosted them has since been replaced by a much more reliable dedicated PCB.
His hexagonal WS2812 individually addressable RGB LED wall display made its debut as an actual interactive device at this Faire. Controlled by a 16-button app on an Android tablet, connected via Bluetooth to a cheap radio on the Arduino that runs the display, the display was fun to make dancing patterns with to music from a small sound system on the table. Next upgrade will be a better drum pad app with velocity and aftertouch, and lots more controls.
Thanks and a tip of the W88 hat to Drew Fustini for some of these pictures!
Rachel and Jim made up some very skinny surface mount LED/resistor strips that fit between Lego posts for a STEM camp Rachel is running.
A simple pattern was etched on flexible copperclad Kapton film, using vinyl from the vinyl cutter as resist. Solder paste blobs and the tiny 0805 components were hand placed, then reflow soldered on the hot plate. Here are some ready to be sliced apart. The resulting glowing Gummi bears were a big hit with the kids!
Campers beta-tested Rachel’s Conducty Inventing Kit during a week-long Spring Break camp at Moore Toys and Gadgets in Wheaton. They built circuits directly on LEGO baseplates using conductive tape and components designed to fit between the LEGO studs. Kids lit up everything from Minecraft torches to outdoor campfires made of LEGO. Here, Cooper and Ella show off their creations. The Conducty LED Inventing Kit will be launching on Kickstarter later this Spring.
Thanks to the laser cutter, we now have an official rubber stamp, and we’re ready to provide Workshop88 visit chops to all our visitors with Maker Passports! OK, as soon as one shows up.
But we now have the capability to make our own precision rubber stamps! Rubber stamps. Yeah, like in the paper-based olden days. Well, I thought it was cool.
Some more details here.
New member and newly certified laser user Scott burned his bacon on the laser cutter tonight. Nice rasher graphic, Scott!
In showing this picture around, I discovered that the whole “Just because we can!” ethos doesn’t resonate equally with all members of my household.
Who says gears have to be round? Here’s a clip of some gears we just made.
And tesselating lizards!
We’ve mapped out a wiring diagram and rough layout for an Arduino-controlled Minecraft landscape. Bill has graciously agreed to write the code. Rachel roped in a bunch of newcomers to build part of the set and brainstorm Minecraft “events.”
We settled on a line of light-up Redstone dust (red LEDs in perforated boxes) leading up to a tree which catches on fire (LEGO flames will stick out of the tree). Then a second tree will catch on fire. We’ll be working on it at Workshop 88 the next couple of Thursday evenings if you’d like to stop by and contribute your Minecraft, LEGO, and/or Arduino expertise. Come play!
We’re gearing up to display this at the Barnes & Noble Mini Maker Faire, along with some other projects. Scott Wojton from the Naperville store has been out to the space a couple of times and has been very helpful to us,so we’re happy to be showing stuff at his Faire Nov 6-8.
The dead laser cutter donated to us by Inventables after blowing one too many power supplies is running! While not yet ready for prime time, a water cooling system in a bucket and a fume exhaust thru the flue from the old furnace allowed first tests. The Shapeoko laptop hosts the RetinaEngrave software that makes it look like a Windows printer.
We’re still getting our feet wet with laser power, speed, number of passes, raster vs vector operations, but we’ve actually cut some paper, wood, and plastic. This wolf head – courtesy of Google Images – adorning a circular saw push stick was the first actual cut.
Daniil had the honor of being the first to produce an actual useful object on the cutter. We think his daughter will be thrilled with these laser cut, hot air station formed goggles for her skateboarding doll. She’s been trying to get some for a while now.
There’s still a lot of work to do making much more proper implementations of cooling and exhaust systems. We need proper electrical connections to guarantee the cooling will be running if the laser is on, and a damper on the exhaust pipe to keep cold air out and the landlord happy. Lots more Ts to cross and Is to dot. But it’s actually cutting stuff and hasn’t blown up yet!
Update 11/12/15: The laser is coming along. We now have “air assist”, and have done some more tests and cuts. Here’s a test using painter’s tape to reduce smoke damage, and a nice W88 logo.
We did some interesting calibration checks on the Shapeoko 2 at the space last night. Driver and viewer software for the USB microscope are now on the Shapeoko laptop. With the ‘scope mounted to the gantry looking at the lines etched on an old-school vernier caliper body we observed average backlash (difference approaching a point from different directions) of around 0.009″. Absolute accuracy varied from 0.003″ to 0.013″. That latter worst case error is about 1/3 the diameter of the holes we drill in PCBs, and so is potentially a problem.
There was some discussion of ways to improve the mounting of the drive belts. With some evidence of belt stretch, replacing all the belts is also under consideration. More details in this post on Jim’s project notes.
Thanks to Daniil, the SO2 now has a PWM speed control! We have high hopes of adding closed-loop speed feedback to it soon. We’re finally getting close to being able to machine plastic! (That’s about impossible at the native 12K RPM of the spindle.)
Workshop 88 had a table at the Southland Mini Maker Faire in Mokena on 8/22/15. Jim’s drawbot string plotter made a “big” hit, standing 6 feet above the table and drawing poster-size images.
The drawbot, a junkbox project inspired by Bill Paulson, is driven by a couple of $3 steppers from American Science and Surplus, some cheap H bridges and an Arduino clone. Software is free from Makelangelo.com. It does the heavy lifting math to convert from X-Y coordinates to the “inches of string” coordinates the polar geometry imposes on its steppers. In addition to accepting normal X-Y gcode, it can take a jpeg image and use the traveling salesman algorithm to generate a single path reflecting the darkness of different areas in the image as it’s doing in the picture above. Such a path is ideal for a plotter that doesn’t have pen lift capability. Yet.