Can You 3D Print an Axe?

3D printers hit the scene in a big way in the last decade, and thanks to the constant improvements that we’ve seen since then you can now get a decent one, assembled or as a kit, for a reasonable price. The one major drawback is that almost all of these printers are limited to printing in plastic, which has its obvious limitations. Printing in metal seems like the next logical step, and a group from Michigan Tech has created something that is accessible to most of us. Spoiler: they used plastic and metal printing to print a functioning axe.

Untill now, most metal printers have used a process like laser sintering to achieve the desired effect. This group uses a much more common tool: a MIG welder. MIG welders work by passing a wire through the welding handle, which would normally used as the filler material for the weld. If you use the wire for laying down material rather than for welding specifically, you can build up material on a surface in essentially the same way that a printer that prints plastic would.

From there, all that’s needed is to attach the MIG welder to a CNC machine and get to printing. The team has produced some great results so far, including some metal braces and farm implements, so hopefully their work leads to another revolution in 3D printing for the masses. We think it’s high time.

Welding Batteries With Batteries

Welding equipment is always expensive and bulky, right? Heavens no! [Jaromir Sukuba] is making a welder for battery tabs which can fit in a pocket and gets its power from a coin cell. It may be expensive to power compared to a mains welder, but for the sake of portability this is quite the hack. Not only that, but it uses 555 timers in the charging circuit.

His entry for the 2017 Coin Cell Challenge saps every bit of power from a coin cell and stores it up in a 100F supercapacitor bank. All that stored energy takes a long time to get into the supercapacitors but it comes out in a flash. In fact, it can take 12 hours to fully charge. For the convenience of size, we have to trade the convenience of speed. This should be a strong contestant for the Supernova and Heavy Lifting categories.

We see a quick demonstration of a successfully welded tab which shows that using coin cells to weld metal to coin cells is equally ironic and apropos. Other welders on Hackaday feature a quicker way to control your battery tab welding, safety-rich spot welding, or just go off the rails completely and use an arc welder to make a coil gun.

JB Weld Fixes Cracked Cylinder Heads

There are persistent rumors that the main ingredient in JB Weld is magic. This two-part epoxy that you would normally find on a shelf next to your basic 5-minute epoxy, Titebond, various cyanoacrylates, and Gorilla glue is somehow different. Stories of ‘some guy’ in the Yukon using JB Weld on a cracked engine block abound. These stories are of course met with skepticism.

Now, finally, we have evidence you can use JB Weld to fix an engine. [Project Farm] over on YouTube gave it the ultimate test: he took the cylinder head off a lawnmower, took a grinder to the head, and patched the hole with JB Weld. The head had good compression, and the engine actually ran for 20 minutes before the test was concluded.

If this were a test of a field repair, it would be a test of an extremely crappy field repair. [Project Farm] made no attempt to ensure the piston didn’t make contact with the blob of JB Weld, and in fact, there was some slight knocking from the piston tapping against a blob of epoxy. Still, this repair worked.

While this serves as proof of the feasibility of repairing an engine block with JB Weld, there is one ultimate test of JB Weld epoxy: build an engine out of it. For years, I’ve been casting my leftover JB Weld into a small square plastic container. In a few more years, I’ll have a block of JB Weld ‘stock’, large enough to machine the parts for a small (.049 cc) glow engine, like what you would find in ye olde tymie model planes and cars. Will it work? I have no idea, but now I can’t wait to find out.

Continue reading “JB Weld Fixes Cracked Cylinder Heads”

Hacking together a color changing water wall

[BadWolf’s] girlfriend wanted him to build her a lamp for Christmas and he didn’t disappoint. What he came up with is a water-filled color changing lamp with bubbles for added interest. See for yourself in the clip after the jump.

The color changing properties are easily taken care of by some waterproof RGB LED strips. [BadWolf] went the Arduino route for this project but any microcontroller will be able to fill the role of color cycling. The enclosure is all hand-made from acrylic sheets. He grabbed some chemical welding liquid from the hardware store and applied it to the acrylic with a syringe. That’s easy enough when attaching the edges to one side of the enclosure. But it gets much tougher when it’s time to seal up the other side. He recorded a video of this which shows the syringe taped to a rod so he can get it down in there, pushing the plunger with a second extension device.

Bubbles are supplied by a small aquarium pump. We’re wondering if this will need frequent cleaning or if you can get some pool chemicals to keeps it nice and clear (or just a teaspoon of bleach)? Continue reading “Hacking together a color changing water wall”

Stretch-bike

This long bike is built for haulin’. After needing to find a truck to transport his welding equipment (ironically in order to build another bike) [Nick Johnson] decided it was time to make a two-wheeled cargo transport. He extended the frame in order to add a cradle in the front. Eventually there will be sides on that box but for now it works like a charm for transporting his groceries. With the long wheel-base this should be pretty stable as long as you balance your cargo. We’d certainly be more apt to try a ride on this rather than the double-decker death-trap from a few weeks ago.

Meat smoker from 55gal drums

[Joel] wanted to use his newly acquired welding skills to make something useful. With tasty flesh in mind he put together this meat smoker. What resulted is incredible, but the fact that he then gave it away as a gift is just amazing.

A curved joint between two pipes is known as a ‘fish mouth’. They can be a hassle, as with the pirate wheel project, but [Joel] used his noggin to make things easier. He first modeled two 55 gallon drums in CAD. The intersecting curve was then generated by the software, printed out on paper, and stenciled on the drum to be cut out with a jigsaw.

[Joel’s] writeup is greatly detailed and shares many pictures. He makes every part of this smoker, including the wood handles and the stainless steel grates. The guy really knows how to build stuff, but we should have known that after seeing the Crushtoberfest.