3d printed gun creater talks of going to hell

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sliqua-jcooter
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25 Apr 2014, 6:33 pm

zer0netgain wrote:

First Gen Glocks had ceramic barrels. I remember Glock marketing them. They didn't hold up very well, so if they wanted to keep the Police/Military market, they needed something more reliable.

Well then, you should have no problem finding old Glock marketing material that backs up your claim.

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Last edited by sliqua-jcooter on 26 Apr 2014, 8:37 am, edited 1 time in total.

Fogman
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25 Apr 2014, 7:06 pm

zer0netgain wrote:

The funny thing is that the Glock was made of all polymers and a ceramic barrel, but in time it went to a metal barrel because the ceramic ones didn't hold up well enough. It's not hard to lathe a gun barrel and "print" the rest of the gun parts...especially once they find a way to make metal-reinforced polymers available for this 3D printing technology.

No such thing as a Ceramic barreled Glock. --That was a line in a movie.
Granted the lower frame is polymer, but the slide, and reciever are steel. Ceramics, especially metal matrix ceramics like those used in jet engines simply cannot stand the shock generated by gunpowder going off, and will fail. This is also why HE has not been utilised in conventional firearms, --HE will shear steel.

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Dox47
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25 Apr 2014, 9:03 pm

sliqua-jcooter wrote:

Well then, you should have no problem finding old block marketing material that backs up your claim.

Freudian slip, or auto-correct? :lol:

Really though, I'm amazed at how often I've heard this particular chestnut repeated, defended even after I've revealed my credentials on the topic and explained the origins of the myth. Then I watch the "shoulder things that go up" interview again and am less amazed.

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Don_Pedro_Zamacona
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25 Apr 2014, 11:12 pm

Raptor wrote:

Just for sh!ts and giggles I went and found this. Personally, I don't find the idea of printing guns to be all that intriguing at the time.
http://www.solidconcepts.com/news-releases/worlds-first-3d-printed-metal-gun-manufactured-solid-concepts/

Quote:

Austin, TX – Solid Concepts, one of the world leaders in 3D Printing services, has manufactured the world’s first 3D Printed Metal Gun using a laser sintering process and powdered metals. The gun, a 1911 classic design, functions beautifully and has already handled 50 rounds of successful firing. It is composed of 33 17-4 Stainless Steel and Inconel 625 components, and decked with a Selective Laser Sintered (SLS) carbon-fiber filled nylon hand grip. The successful production and functionality of the 1911 3D Printed metal gun proves the viability of 3D Printing for commercial applications.

I saw that too. I'm anticipating the day when 3D metal printing can fabricate tungsten carbide cuz I wanna print an MG-42 with a tungsten carbide barrel so the barrel can withstand the high rate of fire without overheating.

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25 Apr 2014, 11:26 pm

Don_Pedro_Zamacona wrote:

Tungsten Carbide would be too brittle, what you want is Inconel, or maybe Stellite.

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sliqua-jcooter
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26 Apr 2014, 8:38 am

Dox47 wrote:

sliqua-jcooter wrote:

Well then, you should have no problem finding old block marketing material that backs up your claim.

Freudian slip, or auto-correct? :lol:

Stupid auto-correct.

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Don_Pedro_Zamacona
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26 Apr 2014, 11:35 am

Dox47 wrote:

Don_Pedro_Zamacona wrote:

Tungsten Carbide would be too brittle, what you want is Inconel, or maybe Stellite.

Good point. When you're firing at >= 1000 RPM, you need a material that has high tensile strength but also low thermal conductivity. Tungesten Carbide is also rather expensive. I actually would go with Boron Nitride(borazon) which also has a low thermal conductivity and is much less brittle(and much higher tensile strength) or just print out the parts for an MG-3 and assemble it as the MG-3 is bit easier to carry and has a shorter barrel. The thing about the MG-3 though is that its barrel is lined with chrome so I'd have to do some electroplating once the barrel is fabricated.

Fogman
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26 Apr 2014, 4:57 pm

Dox47 wrote:

Don_Pedro_Zamacona wrote:

Tungsten Carbide would be too brittle, what you want is Inconel, or maybe Stellite.

I would think that alloys like Inconel or stellite might also be incorrect as they might be too brittle to allow for barrel flex and wave action when cartridges are fired.

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Dox47
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26 Apr 2014, 5:04 pm

Fogman wrote:

I would think that alloys like Inconel or stellite might also be incorrect as they might be too brittle to allow for barrel flex and wave action when cartridges are fired.

I'm actually unsure myself, having never seen barrels made of such materials, but I do know that they are used in power turbines and car engine parts that receive a lot of stress, and that Stellite has been used as a barrel liner before. My knowledge of metallurgy isn't as deep as I'd like, I dipped into it in gunsmithing school and later took a course in it while attending a welding program, but I'm not really an expert.

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Fogman
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26 Apr 2014, 6:18 pm

Dox47 wrote:

Fogman wrote:

I would think that alloys like Inconel or stellite might also be incorrect as they might be too brittle to allow for barrel flex and wave action when cartridges are fired.

It's not really the stress it might be under, it's the acute shock stress of explosives going off that concern me. For example, I know that a lot of new jet engine turbine blades, and blade assemblies are made from a metal-matrix composite ceramic that have no problem with the high heat and pressure stresses inherant to jet engines, yet will shatter like glass, or common pottery when dropped.

Another example of this is seen in regular cast iron, which is certainly a hard material, but will eventually shatter when shock stressed due to it's brittleness. --I've seen videos of Chrysler Hemi derived drag racing engines literally blow up in pieces due to nitromethane fuel.

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