The Newark Maker-Faire is less than two weeks away and I’ve been hard at work finishing up my exhibit Home-made Toys for Girls and Boys. This past weekend I continued assembling toys for display at the show. One such toy is a spiral top described by A. Neely Hall in his book about home-made toys. I created this short video describing how to draw a spiral and build the top. Get your craft supplies ready and I’ll see you at the Newark Museum Saturday April 30.
The Toy Shocking Machine, in all honesty, is a primary reason I chose to construct projects from the 1915 book Home-Made Toys for Girls and Boys for the upcoming 2016 Newark Maker Faire. The innocent nostalgia transports to simpler times when children were encouraged to challenge themselves and explore their world without restraint. Maintaining youthful spirit I imagined owning a device to shock myself, friends, family and strangers for entertainment. I’m old enough to remember similar devices making a splash at amusement parks and science class.
With giddy anticipation I started constructing the heart of the device, the induction-coil. The coil consists of two windings of different gauge wire around an iron bolt. A rapidly interrupted flow of electricity is applied to the central primary coil to create an oscillating magnetic field which, in turn, creates high voltage across the outer secondary coil. The high voltage discharges between the two ends of the secondary coil in the hands of a volunteer.
In hindsight it’s easy for me to parrot the above information and sound as though I know what I’m talking about. I enjoy tinkering with hobby electronics however my understanding is often limited. When I attached the coil to a battery I was baffled as to why it wasn’t shocking me. Confused, I texted electronics genius friend Charlie England. He responded “…you have to apply voltage and remove it very quickly…” I hastily constructed an interrupter as described in the book. Turning the crank created an entertainingly loud racket and a few sparks, but nothing shocking from the secondary coil.
Charlie suggested testing the electromagnetic properties of the coil. I grabbed a small washer, verified it was steel with a real magnet and applied power to the coil. Nothing, the washer fell to the table without hesitation. The only thing that made sense was to apply more power (amps). Working in increasing intervals I finished with two 6-volt lantern batteries in series attached to the coil. No electromagnet but plenty of heat – which is undesirable. Defeated, I informed Charlie I was going to make another coil. He responded with four words, “Send me the coil.” Yessir, the coil was packed and on its way the following morning.
After receiving the delivery Charlie went to work testing my induction coil. The coil only created a 90 volt spike using a 10 volt power source. Charlie determined the secondary coil needed triple the amount of wire layers to generate a palpable shock. Charlie also designed and created an interrupter circuit employing a proximity switch. It was left to my imagination on how to integrate this interrupter circuit into the device. Because the proximity switch detects ferritic material I created a wheel with thumbtacks placed at fixed intervals around the perimeter. When a thumbtack passes under the proximity switch the switch turns on, when the thumbtack passes the switch turns off.
I added several more layers of wire to the coil, attached it to the new hi-tech interrupter and with a little fussing around, success! A tangible shock was felt when the interrupter was engaged. Knowing the coil was working correctly I built the third and final interrupter for the circuit integrating wooden gears to increase the switching frequency. Everything works like a charm. I will continue tinkering with this device leading up to the Maker Faire to ensure an entertaining and dependable experience.
Also known as a button-on-a-string, the buzz-saw whirligig is a noise-making device which utilizes an object centered on a loop of cord. The buzzer described in Home-made Toys for Girls and Boys spins a cardboard saw blade to generate its hypnotizing whirring sound. Using both hands the enjoyer must hold each end of the loop and rotate the saw blade to wind the loop. The blade is whirred by adding and releasing tension on the loop which unwinds and, because of the angular momentum of the blade, winds the loop again in the opposite direction.
Making a buzzer is a fun, fast and instantly rewarding project. Cut cardboard, glue a “spool-end” on the center of each side, drill two holes for the cord in the spool-ends, thread the cord through the holes and tie the ends together to create a loop. To my amazement my first buzzer worked splendidly; however Fleur our poodle isn’t as amused by the osculating pitch emanating from the new mysterious gizmo.
I decided build a bunch of buzzers as swag for the Newark Maker Faire. Friends saved cardboard from recycling and donated it to the cause. The cord for the buzzers was retrieved from a pile of bakery string saved from years of bakery boxes. Small bits of recycled broom handle are substituted for spool-ends because I don’t have many spools in inventory. The title artwork of my exhibit was printed on the cardboard using a carved linoleum block. To print each buzzer ink was applied to the carved linoleum block using a brayer, the buzzer cardboard was placed over the inked block and pressure was applied to transfer the ink from the block to the cardboard. When the ink dried I cut each buzzer out with a pair of scissors.
Please stop by my exhibit at the Newark Maker Faire, Saturday April 30 to pick up your free buzzer while supplies last!