Four Whistles Version 2

myminifactory

Four Whistles Version 2 is my first attempt at creating a "calliope" (well, sort of calliope) design utilizing the basic knowledge I gained from the original Four Whistles model (https://www.myminifactory.com/object/four-whistles-31628). As someone who isn't a musician and struggles with hearing loss, you might be surprised to learn that this model is attempting to play "Mary Had A Little Lamb" using a balloon to power the whistles and a hand crank to operate a cylindrical sequencer. To play "Mary Had A Little Lamb", I incorporated four whistles into the design of this model, each controlled by one of four air valves. Each of these air valves is activated by a rotating cylinder containing small 2.5mm "bumps" that trigger the valves in the correct order (the "cylinder sequencer"). To minimize air loss and maximize play time, I designed the valves with a 3 degree preload, created valve "axles" using a virtually airtight membrane with torsion bars, and added an extra layer of protection against air leaks by sealing the valve body assembly with clear silicone caulk (see below). While the caulk isn't strictly necessary, it will significantly enhance the model's performance. To complete this project, you'll need to purchase a "punch balloon", one roll of .7mm thick rubber electrical tape (just 3 inches or so will do), a bottle of "thick" cyanoacrylate glue, and a small tube of clear silicone or acrylic caulk. I also used scissors, a single bevel razor blade, a modeling knife, a needle file set, a small slip joint plier, a jewelers screwdriver set, a rubber mallet, and a vise for assembly. As with all my projects, I likely forgot a few essential tools or supplies, so don't hesitate to ask if you have any questions. After all, I make mistakes with the best of them. Designed using Autodesk Fusion 360, sliced using Cura 2.3.1, and printed in PLA on an Ultimaker 2+ Extended and an Ultimaker 3 Extended.