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here we go

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Eric Charles

Re: 3-D guns

Arlo (and Marcus)... you are correct that plastic gun barrels are not a great idea, but more sophisticated 3-D printers could eventually overcome that. At any rate, it is awfully hard to regulate the sale of smooth steel tubes....

A mostly 3-D printed gun can get off several rounds before failure. It is not a practical long term weapon, but it gets the job done well enough to render gun regulations silly amongst people with the resources. Certainly it is obvious that people can 3-D print the soon-to-be illegal large magazines and other such gun parts. A lot of these stories only hit recently. See, for example:

http://www.extremetech.com/extreme/145664-3d-printed-30-round-ar-magazine-brings-us-ever-closer-to-a-fully-3d-printed-gun
http://www.wired.com/dangerroom/2012/12/weaponeers/

http://www.webpronews.com/gunsmith-uses-3d-printer-to-make-a-rifle-2012-07

--------
Eric Charles
Assistant Professor of Psychology
Penn State, Altoona

From: "Arlo Barnes" <[hidden email]>
To: "The Friday Morning Applied Complexity Coffee Group" <[hidden email]>
Cc: "arg irk" <[hidden email]>
Sent: Sunday, January 20, 2013 3:11:35 PM
Subject: Re: [FRIAM] here we go

One of the downsides of email's serial format rather than hypermedia's tree format is that I cannot make this message just a child of an earlier message, but instead the whole threas.

Old (drafted days ago):To focus on a different aspect: Clips are one thing, but it does not seem 3-D printed parts would be appropriate for most parts of a gun. Barrels, for example, have to withstand both high heat and pressure, and be smooth so that the bullet can exit easily. I would doubt ABS/PLA plastics could perform as needed, but then again I have read that Glock was also regarded suspiciously as a 'plastic gun', but then grew to be favored. Then again, it is a special plastic.

New: Is this the selfsame Axiom of Choice that enables Banach-Tarski if used?

-Arlo James Barnes

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Marcus G. Daniels

Re: 3-D guns

On 1/20/13 1:31 PM, Eric Charles wrote:

A mostly 3-D printed gun can get off several rounds before failure. It is not a practical long term weapon, but it gets the job done well enough to render gun regulations silly amongst people with the resources.

http://www.slashgear.com/staples-easy-3d-printing-service-set-to-launch-in-2013-30259046/

..or a high school, community college shop, or university fabrication lab..

Marcus

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glen ropella

Re: here we go

In reply to this post by Arlo Barnes

Arlo Barnes wrote at 01/20/2013 12:11 PM:
> New: Is this the selfsame Axiom of Choice that enables Banach-Tarski if
> used?

Yes, that's the way I intend to use it.

--
glen

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