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franklyn
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Amazing resolution of detail
http://www.tgdaily.com/games-and-entertainment-brief/68252-t...
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franklyn
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People who rush out to purchase firearms in anticipation of gun control
measures are not part of the " gun culture." The " gun culture " already
has its arsenal stocked up. The " last minute shoppers " are people who
believe one day they may need a gun and may not be able to buy one.
These are the same people who clean out the hardware store before a
severe weather storm hits. http://www.cnbc.com/id/100374251
Banning the future
www.3dprinter.net/3d-printers-obsolete-firearm-controls-and-...
www.3dprinter.net ,
is a very good site dedicated to this emerging technology
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[Edited on 13-1-2013 by franklyn]
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franklyn
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Lost wax casting is a means by which highly detailed objects can be cast in metal.
The wax object is covered in a ceramic which forms the mold. Upon heating the
wax is volatilized leaving the hollow form which is then filled with molten metal.
3D Printing can produce onto a stiff rod a plastic core representing the rifled bore
for a barrel on which ceramic powder is then bonded the same as in the lost wax
casting process. The item is then fired as are clay pots in a kiln leaving just the
hardened hollow ceramic barrel. This can be inserted into a heated metal pipe
which when it cools shrinks tightly to provide necessary radial strength. No metal
casting is required and the kiln is easily improvised with natural gas or charcoal
and a hairdryer for a blower.
View in particular the video cited here _
http://www.popsci.com/technology/article/2012-08/wiki-bluepr...
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Swede
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Using a 3D printer to make a pattern for lost-wax casting would be superb, but the plastic material would need to be compatible with the process, i.e.
melt easily, and leave no significant residue when the ceramic mold is fired.
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franklyn
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Lost Wax Investment Casting
www.youtube.com/watch?v=cptlGzWYFEk
Detailed description
www.youtube.com/watch?v=TEQxwq5pKrQ
If a metal gun barrel is desired , a thermite mix is ideal for pouring molten metal.
The problem is with precisely including the small amount of additional elements
for a suitable hard alloy of say 4150 steel or 440 stainless steel. Because of the
inherent variables in the result this approach has difficulties. There exists ready
made thermite used for welding train rails - www.thermitalloys.com/foundry.html
Despite limited use for expedient repairs , there has been little development.
The same technique can produce a superalloy with no iron such as MP35N
35% Cobalt , 35% Nickel , 20% Chromium , 10% Molybdenum. This will
tolerate small impurities inevitably present from crucible founding. This
Metallurgy has been investigated since between the first and second world
wars. Here is a reference from 60 years ago.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/1993009...
www.smithsadvanced.com/downloads/MP35N_AMI.pdf
www.latrobesteel.com/assets/documents/datasheets/MP35N_summary.pdf
www.latrobesteel.com/assets/documents/datasheets/MP35N_extended.pdf
As seen in the following depictions one can in principle fire a mixture of the
metal oxides , I only found one paper about thermite produced superalloys
Thermite type combustion synthesis and direct casting of intermetallic compounds and super alloys
Yamada O.; Matsumoto H.
www.amazingrust.com/Experiments/how_to/Thermite.html
www.amazingrust.com/Experiments/how_to/Thermite_pics-videos....
Fe Ni Cr demos
http://www.youtube.com/watch?v=MfIHtxaY8Jw
Cobalt
http://www.flickr.com/photos/thorius/4799545504
A universe of Thermites are listed in the appendices
Survey of Combustible Metals , Thermites , & Intermetallics for Pyrotechnic Applications
www.dtic.mil/dtic/tr/fulltext/u2/a419762.pdf
Single crystal directionally cast superalloy such as made for turbine blades is
very difficult to execute successfully because it requires a very accurate gradient
of cooling applied to the part as it forms over a period of up to hours. The mold
is also maintained in a vacuum to prevent inclusion of air being solvated into the
molten metal which produces impurities that serve as nucleation points for
other crystal formation. Initially the metal poured into the mold fills a " pigtail "
corkscrew shaped extension at the bottom which by it's shape allows only a
single crystal lattice to form upward to fill the entire mold cavity.
http://images.machinedesign.com/images/archive/fea0200jpg_00...
Application of 3D mold rendering to investment single crystal casting. Here the
use of 3D printing methods replace the first step in the process of production -
the original patterns for the part to be made and it's production molds which
used to be tediously handcrafted by skilled machinists.
www.manufacturing.net/articles/2012/05/casting-process-could...
http://blog.makezine.com/2012/01/16/single-crystal-superallo...
www.msm.cam.ac.uk/phase-trans/2003/nickel.html
Casting Processes ( directional solidification on page 41 )
www-old.me.gatech.edu/jonathan.colton/me4210/casting.pdf
www.thefreelibrary.com/How+it's+done:+single+crystal+casting:+the+techniques+used+in+the...-a0265978583
_________________________________________________________
An alternative to traditional metal parts is the use of reinforced composite materials.
Usually this is taken to mean an organic resin glass fiber matrix. This is adequate
for many parts and is presently used in many commercially produced firearms. The
durability and stress resistance of the principle functioning parts as barrels require
much stronger hard material. The same exact technique can be used with ceramics.
http://en.wikipedia.org/wiki/Ceramic_matrix_composite
An equal mixture of finely powdered borosilicate Pyrex and minute asbestos " whiskers "
can be fired so that the glass melts at ~ 820 ºC , the asbestos fibers do not melt until
a much higher temperature depending on the particular mineral form - up to 1500 ºC.
http://ces.iisc.ernet.in/energy/HC270799/HDL/ENV/enven/vol31...
The fibers remain intact and encased by the solidified glass to form a tough durable
material. An equal mixture of quartz Vycor powder which melts at ~ 1650 ºC , and
Silicon Carbide whiskers which melt at ~ 2700 ºC , can be used also , producing a
superior ceramic. The higher temperature required would make it difficult to fire in an
improvised kiln. Also , ceramic particles small enough to be inhaled pose a hazard in
the initial compounding of the powdered material and it needs to be safely handled.
www.acm-usa.com/Pages/Materials/detail.aspx
www.acm-usa.com/Pages/Materials/detail.aspx?fsId=0
www.acm-usa.com/site/user/files/1/Product_Datasheet__SC_9M.pdf
Analytic Model Development for Ceramic Gun Tubes
www.dtic.mil/dtic/tr/fulltext/u2/a441236.pdf
Mechanical and Thermal Properties of Advanced Ceramics for Gun Barrel Applications
www.dtic.mil/dtic/tr/fulltext/u2/a430400.pdf
5.56mm Ceramic Gun Barrel Thermal Analyses with Cycled Ammunition copy upper and lower strings separately and paste
them together in the address bar
www.ciar.org/ttk/mbt/papers/isb2007/paper.x.isb2007.IB06.5_point_56mm_ceramic_gun_barrel
_thermal_analyses_with_cycled_ammunition.huang_conroy_carter.2007.pdf
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497
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Love the sounds of those ceramic composites!
Maybe all this innovation crap is just to too good to be true... http://www.manufacturing.net/blogs/2012/12/the-patent-office...
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gregxy
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Those articles on ceramics are interesting but not very
encouraging for firearms. The best yield strengths for the
ceramics quoted were around 300MPa. For alloy steel
hardened to RC 35, which is typical for guns, the yield
strength is 1100MPa more than 3X higher. The steel
however can stretch up to 15% before total failure, the
ceramic only 0.7%. While stretching the steel absorbs
a tremendous amount of energy and allows the gun
to fail gracefully with a bulged barrel instead of blowing to bits in your face. Failures of this type do happen due
to incorrectly loaded cartridges.
From looking on the web there have been some experiments
with ceramic lined barrels, but I did not see anything in
production.
There is a website for home gunsmiths (I think it is
homegunsmith .com or .org.) They make some really
cool guns, but most start out with a barrel from an
old gun due to the difficulty of creating the rifling.
However there was a guy that did his own rifling
using a twisted strip of steel.
Black powder guns can be made at home since the
internal pressures are much lower 10,000PSI vs 60,000
PSI for a high power modern weapon. Plus you can
make your own powder and the ATF does not consider
them as firearms.
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franklyn
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The shot heard around world - first 3D-printed gun fired
Hurrah for chaos and anarchy !
www.cbsnews.com/8301-205_162-57583010/liberator-gun-made-wit...
Just to prove that you can't fix stupid :
New York Sen. Charles Schumer, called for a ban on printable weapons
" A terrorist, someone who's mentally ill, a spousal abuser, a felon can essentially open a gun factory in their
garage, "
www.nypost.com/p/news/national/gun_is_lock_upload_mcSF4lQ6cp...
“ We’re facing a situation where anyone — a felon, a terrorist — can open a gun factory
in their garage and the weapons they make will be undetectable. It’s stomach-churning. ”
Duh , I'm with stupid
New York Congressman Steve Israel has called for national legislation to ban 3D-printed guns
" Now that this technology is proven, we need to act now to extend the ban on plastic firearms."
www.foxnews.com/tech/2013/05/06/shots-fired-from-world-first...
Our society would be better off if these persistent vegetative brain stems would ban themselves.
How can anyone for who getting a manicure , is the only first hand knowledge of manual labor ,
possibly be competent to govern manufacturing , are you starting to get the drift of why the U.S.
no longer makes anything. Everything they put their paws on is turned to shit.
In 1930 Detroit was the fastest growing city in the world. Today it is the fastest shrinking ,
with over 100,000 abandoned homes , it's going back to prairie.
www.atf.gov/firearms/faq/firearms-technology.html#commercial...
" per provisions of the Gun Control Act (GCA) of 1968, 18 U.S.C. Chapter 44, an unlicensed individual may make a firearm
as defined in the GCA for his own personal use, but not for sale or distribution."
" Individuals manufacturing sporting-type firearms for their own use need not hold Federal Firearms Licenses ( FFLs)."
www.foxnews.com/us/2013/05/23/govt-memo-warns-3d-printed-gun...
Homeland Security bulletin warns 3D-printed guns may be 'impossible' to stop
" Unqualified gun seekers may be able to acquire or manufacture their own guns with no background checks. "
Yeah , so long as there are people unqualified to express their unwanted opinion , but do so anyway.
Not to be upstaged , the State Department takes action.
www.wired.co.uk/news/archive/2013-05/10/defcad-gun-design-ta...
These titans of industry havn't quite put 2 and 2 together yet either.
How low down the evolutionary trunk do you have to be to still have doubts.
No desk bound cretin can subvert a handy man.
www.pcmag.com/slideshow/story/309243/defcad-3d-printing-mean...
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elementcollector1
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Why wasn't this a problem before? I know plastic can't be detected by normal methods, but anyone with a decent metalworking ability should be able to
build a working flintlock if they really set their mind to it.
Oh, but now that futuristic technology's involved, it's a problem. Ban the 3-D printers! Forestall the advance of scientific ingenuity! And especially
don't trust anyone that has one already - they could be a terrorist and you don't. Even. Know it.
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
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franklyn
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The plastic ' zip ' gun
http://abcnews.go.com/International/danger-rapid-spread-prin...
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franklyn
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All metal
www.theverge.com/2013/11/7/5077718/worlds-first-3d-printed-m...
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franklyn
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All carbon
www.gizmag.com/markforged-mark-one-carbon-fiber-3d-printer/3...
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Zyklon-A
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Here's what I think about this...
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IrC
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Why are you hijacking the thread which is about making something high tech, by turning it into yet another left wing political bash fest by posting an
anti gun video by a leftwing canadian whackjob. Franklin was not posting information about political viewpoints. All he was doing was posting details
about the technology. The thread is about 3D printing. As an American know that I for one do not give a crap what the canadian in the video thinks
about what goes on down here. None of his business. Nor do I think it is proper for you to post a video loaded with insults about people who believe
in the Constitution, or owning firearms.
Watching the video:
At 2:00; "as usual, this is the part you ignore when you start leaving uninformed, poorly spelled comments about how much I hate guns (and therefore,
America)"
At 2:42 tries to show a slanted statistic of guns used for self defense by omitting the five worst cities for examples, where FBI stats are far more
accurate and show exactly the opposite conclusion. States in red an implied negative about Constitutional Conservatives "or at least that's what them
commie liberals want you to believe so they can come take our guns". (Ironically by fixing the stats it is a self fulfilling prophecy on his part)
By 2:56 attacking and insulting the Bill of Rights, Founding Fathers, ignoring the true reason for the second Amendment by stating fallacies as a form
of propaganda. Continues with repetition implied negatives about Constitutional Conservatives, including bringing in the 'tinfoil hat attack',
singling out a tragic child involved gun accident and repeats it more than once as if it adds weight to his point of view. By implication these
tragedies are out of control happening everywhere at astronomical levels, patently false. In general a nonstop 3D printing gun bashing typical left
wing liberal attack upon gun ownership. Nothing but an anti gun political hit video which has no business being posted in this thread. Zyklonb by
stating "Here's what I think about this..." is in effect also bringing this in as his view, off topic and improper in this thread. Ironic considering
his name and the millions of murders of innocent people it represents. Even more ironic is those millions of murders could have been avoided had the
victims not given up their guns when ordered by the government. Also ironic since the very reason for the Second Amendment in the first place
(misrepresented in the hit video) is to protect from out of control murderous criminal government such as his namesake represents, not the hunting,
sports, and home defense which is all the left ever considers.
"Science is the belief in the ignorance of the experts" Richard Feynman
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Metacelsus
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Agreed. There are plenty of other uses for 3D printing than guns. Please don't derail this thread into the morass of politics.
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bfesser
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[closed]
The OP was specifically targeted at the implications of 3D printing firearms. However, since this topic isn't about "regulatory and social issues
<em>affecting scientific hobbyists</em>," it was on the verge of closure from the outset. The beginnings of a flamewar lead me to the
decision to close this thread. If you want to continue discussing firearms and the legal/moral implications of their manufacture, there are surely
websites dedicated to the topic. If anyone would like to discuss the use of 3D printers <em>for amateur science</em>, please feel free to
open such a topic—I'm sure it would be welcomed by all.
<strong><a href="viewthread.php?tid=25805">Does your post belong in Legal and Societal Issues?</a></strong>
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