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Joined 1 year ago
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Cake day: June 15th, 2023

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  • As long as you don’t need particularly tight tolerances or fine details, it works perfectly fine. The setup really isn’t anymore complicated than I described. I have done it just because I wanted to see how difficult the process is. It’s around $100 in startup costs assuming you have access to a printer. After that it’s mostly just waiting and occasionally measuring cut progress.

    Check out the Rack Robotics Powercore as well. It’s a low cost wire EDM system that uses cheap 3D printers as a motion platform. It uses a very similar principle to cut metal using wire as the cutting tool. May or may not be more suitable depending on your exact use case. Still pretty rough around the edges though; SendCutSend makes more sense for most people that need things cut from flat stock for the most part.



  • The reality is this is one of a handful of emerging technologies that are going to reshape a lot of things about the world in the future in ways I don’t think society, as a whole, is cogniscent of, let alone prepared for.

    This is one of them. The battlefield use of small drones is another.

    I tend to say that the world we’re living in now is one where gun control is increasingly obsolete. That’s not a moral judgment. It’s not a statement on whether that’s a good or bad thing. It’s just what I think we’re going to increasingly find to be the new reality: the rise of small scale, low cost, divertible manufacturing technologies is going to make traditional supply-side approaches to regulation untenable. That genie is out.

    (Drones are in a similar, if distinct space: low cost, commodity, and divertible from low/no regulation supply chains in a way that makes it nearly impossible to cut off supply without shutting down other legitimate economic activity).

    I don’t know what the right answer is. I do think it’s going to take a pretty fundamental rethink of how we approach these problems. I don’t think the full ramifications of these types of technology have really reached the wider zeitgeist, and, frankly, I kind of worry about how people will react. There are a lot of pretty scary paths this could take, both in terms of how the technology gets used and in terms of what attempts to curb them could look like if they’re not carefully thought through.


  • Machine is borderline overselling it.

    The ECM process works by pumping water containing an electrolyte through a metal part. When a current is applied to the water, exposed metal gets slowly etched away.

    What these groups are doing is starting with high pressure hydraulic pipe and inserting 3D printed jigs that are basically a negative mask to bore out the pipe to their desired diameter, cut the chamber, machine in rifling, etc, with the end product being a functional barrel. As far as I’m aware, so far this has been limited to pistol caliber cartridges; rifle calibers are a step up in pressure and come with a whole host of different engineering challenges.

    The “machine” is really nothing more than a bucket, an aquarium/pond pump, and a desktop power supply. It’s honestly a really clever approach to the problem from an engineering standpoint.









  • Fleet yaw is a different phenomenon that impacts terminal ballistic performance. It’s essentially a way of describing why some projectiles tumble and fragment after impact while others will tend to remain more stable and pass straight through for longer.

    The projectile AoA being described in that context is only a couple of degrees. It’s enough to change how the round behaves after hitting something, but it’s not the type of in-flight wild tumbling that results in keyholing on a target.



  • Subaru’s AWD system is legitimately better at putting down power to the wheels and getting traction than the vast majority of other AWD systems on the market. There are plenty of third party tests showing as much.

    That said, it’s a question of whether you actually need that. The truth is the vast majority of people don’t need AWD at all for the kind of driving they’ll actually do.

    I have an STi which has an active center differential beyond even the typical Subaru system and I absolutely love it. It’s magic feeling it at work. But my “likes to take the car on dirt and go sideways at 50MPH” use case isn’t needed for a commuter either.