Mining And Refining: Mine Dewatering

From space, the most striking feature of our Pale Blue Dot is exactly what makes it blue: all that water. About three-quarters of the globe is covered with liquid water, and our atmosphere is a thi…

Junk Bin Build Lets You Test Fuel Injectors On The Cheap

Fiddle around with cars long enough and you’ll realize two things: first, anything beyond the simplest repairs will probably require some kind of specialized tool, and second, those tools can…

A Compact Electrohydrodynamic Pump Using Copper And TPU

Electrohydrodynamics (EHD) involves the dynamics of electrically charged fluids, which effectively means making fluids move using nothing but electric fields, making it an attractive idea for creat…

Rebuilding A $700k Refrigerator

When cleaning out basements, garages, or storage units we often come across things long forgotten. Old clothes, toys, maybe a piece of exercise equipment, or even an old piece of furniture. [Ben] a…

The Wirtz Pump Spins

Over the ages, a lot of human activity has been concerned about getting water from where we find it to where we want it. If you want to move water to a lower elevation, there’s no problem. Bu…

Vacuum Chamber Gets Automation

[Nick] does a lot of custom work with vacuum tubes. So much so that he builds his own vacuum tubes of various shapes, sizes, and functions right on his own workbench. While the theory of vacuum tub…

Powerful Water Pump Is Modular In Nature

If you’ve got one decently powerful DC motor, you could conceivably build a water pump. Gang up ten of them, however, and you could build something considerably more powerful, as [akashv44] d…

Is This The World’s Largest Dot Matrix Printer?

[RyderCalmDown] was watching a road painting vehicle lay down fresh stripes on the road one day and started thinking about the mechanism that lets it paint stripes in such a precise way. Effectivel…

Homebrew Tire Inflator Pushes The Limits Of PVC Construction

Let’s just clear something up right from the start with this one: there’s literally no reason to build your own tire inflator from scratch, especially when you can buy a perfectly servi…

Fish Tank Dosing Pump Built Using Pi Pico

When you’re maintaining a fish tank, it’s actually quite important to get all your basic chemistry right. Mismanage things, and you’ll kill all the helpful bacteria in the tank, o…

3D-Printed Lobe Pump Shifts Water Well

Lobe pumps are perhaps most popularly known for their use in Rootes-type superchargers, but they can pump water, too. [Let’s Print] demonstrates this ably with a 3D-printed design that can pu…

Stout Peristaltic Pump Fabricated From Scratch

The peristaltic pump is perhaps most well known for its ability to pump fluids without the pump mechanism coming into contact with the working fluid. This is key for food-safe applications and othe…

Stout Peristaltic Pump Fabricated From Scratch

The peristaltic pump is perhaps most well known for its ability to pump fluids without the pump mechanism coming into contact with the working fluid. This is key for food-safe applications and othe…

An Oil Diffusion Vacuum Pump From Thrift Store Junk

It seems like creating a vacuum should be a pretty easy job, but it turns out that sucking all the air out of something is harder than it seems. A cheap vacuum pump will get you part of the way the…

Power Your Home With A Water Battery

I’ve stated it before on Hackaday but one of the most interesting engineering challenges posed to me this year was “how could you store enough energy to power a decent portion of a home…