Lego Styrofoam Cutter

Lego bricks are great for making models, but sometimes you can make real tools with them. If you want to work with foam you should definitely consider building this hot wire cutter. It’s a great tool because it doesn’t leave any dust and it cuts through foam like butter. A few years back I didn’t have any scrap wood but I had plenty of Lego pieces.

Homemade BB Gun using a One Way Valve

I got bored and decided to make a BB gun using my air compressor. The secret sauce is a one way valve that blocks air from the firing chamber but allows air in the other direction to rapidly propel ammo into the gun. This allows me to tube fed BB’s, even when the gun is inverted. It’s also much faster than gravity feed versions. Watch the video for some action shots and how to make the valve.

Homemade ACME Tap


I’ve been working on a new CNC mill and I’m using ACME rods to drive the x and y axis. An ACME rod has about half the turns per inch when compared to a standard rod and allows the machine to move twice as fast. The only downsides are ACME couplers and nuts are expensive and difficult to make without $40 ACME taps. I stumbled onto Michael McKinley’s site and decided to try making a  homemade tap. He used a drill press and a file for his. I wanted to spice it up and used a Dremel and belt sander, it took 30 minutes and saved me a lot of money. Best part this trick can be used on any threaded rod as long as the material you are cutting into is soft. Michael’s site has a lot more detail on the angles of the flutes and how to cut the reliefs. I winged it since I was only cutting delrin plastic. I might fine tune it at a later date if I want to try some soft aluminum.

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DIY Power Supply

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Today we take a look at re-purposing a computer power supply.

If you’re anything like me you probably have a couple of computer power supplies lying around your home. I collect mine because I like having a replacement power supply on hand just in case the one inside one of my computers stops working. But the fact is, PC power supplies tend not to die, which recently got me looking for other ways I can use them. What I found to be a good use for them is to use them as bench top power supplies.
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