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Tag Archives: project

I Shot the Mailman: Check Out This Giant .44 Magnum Mailbox

Gun Mailbox

Roger Buchko wants mailmen and delivery guys to pull the trigger every time they stuff his mail into the barrel of his giant .44 Magnum revolver mailbox. The massive letterbox–all 350 pounds of it–is set up prominently on his front lawn. Its barrel is made from PVC pipe and the entire thing is held into place by its even heavier 1,200-pound base.

Roger, who is a semi-retired cabinet maker, is a gun rights supporter, but he didn’t build the mailbox to make some sort of political statement. Rather, he decided to make it after seeing similar designs posted online. Or so, he says.Continue Reading

Think That 12 Inch Subwoofer Is Badass? Try 6 Feet On For Size!

Let’s get the sad part out of the way from the start: you can’t buy this monstrosity. But it’s nice to know that in the spring of 2011, with a bit of elbow grease and a $600 budget, some engineering students from the University Of Wisconsin were able to create a subwoofer with a cone 6 feet in diameter. It was simply called The Giant Speaker. Seeing as this was done on a shoestring budget, the best materials for the job couldn’t be selected. The driver was made of fiberglass, instead of the preferable carbon fiber for instance. Still, the team used 24 Neodymium magnets to drive this giant cone with the voice coil driver being fabricated by hand with three layers of 18awg wire wound onto G10 form attached to a fiberglass disk for support. The giant speaker was then placed in an 8′ by 8′ by 2′ cabinet and set in motion by a “20kW PWM voltage sourced inverter (intended for motor drives and microgrids) which was powered by a 400V DC power supply. At low frequencies (~10 Hz) peak coil currents were 100A.” Turn out it was able to run at frequencies between 5Hz and 50Hz, after which the inertia just became too much for the system to handle. In tests, the group found out that the resonant frequency of the building they were in was 7Hz, which resulted in several complaints from the other tenants and lots of high-fives from the students. No word on whether they found the Brown Note.

[ Project Page ] VIA DamnGeeky ]