Free Republic
Browse · Search
Bloggers & Personal
Topics · Post Article

Skip to comments.

Advanced 3-D Printing Technology on the Verge of Making Gun Control 'Impossible'
Reaganite Republican ^ | 22 December 2012 | Reaganite Republican

Posted on 12/23/2012 5:09:08 AM PST by Reaganite Republican

Seems the progs are at it again, not actually accomplishing anything you could call 'progress' re. gun violence while pig-headedly attempting to fix yesterday's problems with solutions that never worked in the first place...


It's a long-running shtick with liberals, where they claim the ability to control the uncontrollable: now they're out to 'control' weapons-possession in the US just as 3D computer technology is making 'printed guns' a reality- a democratization of weaponry they're never going to put the kibosh on, obviously:
_______________________________________________________________________


Forbes via Doug Ross:

Three months ago, the gunsmiths behind the group known as Defense Distributed announced their intention to create a working, lethal gun anyone can download and 3D-print at home. 

Now their experiments with actual 3D-printed firearm components and live ammunition have started. And they’re documenting their progress on video.

Over the weekend the project’s founder Cody Wilson posted a YouTube clip of the group testing an AR-15 semi-automatic weapon Defense Distributed assembled with a 3D-printed lower receiver, the highly-regulated component that serves as the body of the gun onto which the barrel, stock, magazine and other elements are attached... 

...The result of Defense Distributed’s experiment: Their home-printed AR-15 piece cracked and fell apart after firing just six rounds. But Wilson still considers their first test of a partially-downloadable weapon a successful learning experience... 

...A lower receiver has special significance to gun enthusiasts: It’s the central part of the weapon that’s regulated by gun control laws and trackable by serial number. Print your own lower-receiver at home, and in many states all the other parts can be obtained without background checks or even identification...

_______________________________________________________________________________

And did you scheming Obammunist tools at DHS note the 3-D printed guns are made of plastic? MAYBE it's time you all stop putzing-around, fomenting war with the TEA Party and get to work on a way to deal with the undetectable AR-15 clones
Al Qaeda and Hamas operatives are going to have printed-up by the vanload the minute they waltz over the porous Mexican border you intentionally created.


Prices on 3D printers are dropping fast, but one capable of producing the AR-15 lower receiver used in the test above would run in the $10,000-range... not cheap, but hardly prohibitive, either.

For any who scoff at the fact that at the current state-of-the-art, printed guns tend to disintegrate after a few shots, you know that's going to change as the technology advances- something that never seems to take very long these days. 

fwiw, in the 1940s the US Army found plenty value in distributing one-shot, throwaway guns to aid the European resistance behind Nazi lines, more here...


Video/more at Reaganite Republican...


_________________________________________________________________________________

DougRoss@Journal   Chicago Sun-Times   Forbes   Newser   TheNextWeb   AR-15 Forum   BadBlue


TOPICS: Government; Politics; Science; Society
KEYWORDS: amendment; assault; banglist; guncontrol; guns; second; secondamendment

1 posted on 12/23/2012 5:09:18 AM PST by Reaganite Republican
[ Post Reply | Private Reply | View Replies]

To: AdvisorB; ken5050; sten; paythefiddler

*** PING ***


2 posted on 12/23/2012 5:10:36 AM PST by Reaganite Republican
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

CNC machines make gunmaking easy, and nothing is easier to make than a fully automatic sten gun, using a fixed firing pin and firing from an open bolt. Heat harding and castings are more complicated, but not that difficult.

The issue is ammunition. Making smokeless powder, primers, and cartridges is more complicated than making the gun they go in. Try making even a good copper jacketed bullet at home.


3 posted on 12/23/2012 5:29:03 AM PST by SampleMan (Feral Humans are the refuse of socialism.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican
From this:



To this:


4 posted on 12/23/2012 5:29:32 AM PST by equaviator
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican
The gun haters and hoplophobes completely misunderstand this, as they do all things having to do with firearms.

Barrels, upper receivers, bolts, bolt carriers, and cams can't be made of printed plastic. Only the lower receiver, and possibly the butt stock and pistol grip, and maybe some of the small trigger group parts (disconnector).

You watch: after they ban AR-15's, they will start banning or at least requiring a federal license for 3D printers. They don't give a rat's a$$ what the effect on the economy is. They have a purely fear-driven need to enforce a state monopoly on deadly force.

5 posted on 12/23/2012 5:31:01 AM PST by backwoods-engineer ("Remember: Evil exists because good men don't kill the gov officials committing it." -- K. Hoffmann)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

This should be good news to all the libtards who think of humanity as a plague on the earth. Now we can give every one of them a simple, effective way to remove themselves.


6 posted on 12/23/2012 5:31:36 AM PST by STYRO (Hope you takers don't expect us producers to defend you. War sucks most for the losers.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

Shocker to Libtards who wet their pants at the thought of printing guns at home: IT IS PERFECTLY LEGAL. It is not legal to do it as a business, but you are allowed to fabricate your own non-Title II firearm for your own use, and even to sell it later.


7 posted on 12/23/2012 5:41:04 AM PST by Yo-Yo (Is the /sarc tag really necessary?)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

There is one simple reality to all this that few have mentioned.

Because of the sheer number of guns and people determined to keep them, the Admin will run out of police military and whatever else before a fraction of them will actually be confiscated.

How many glory hounds are going to put their lives on the line every hour of the day as known confiscators? They will quit. Fast. And The admin will not find enough people to replace them.

The Matt Bracken story posted here on FR a couple months back is EXACTLY what will happen IMO.


8 posted on 12/23/2012 5:46:49 AM PST by Norm Lenhart
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

Plastic is nice but this is the direction for future manufacturing ATM. When the “corner” machine shop / store can make anything you want then it is the end for control freaks. The following description is from the company that makes the machine:

Additive Manufacturing (AM)

Additive Manufacturing is the process of producing parts by successive melting of layers of material rather than removing material, as is the case with conventional machining.

Each layer is melted to the exact geometry defined by a 3D CAD model. Additive Manufacturing allows for building parts with very complex geometries without any sort of tools or fixtures, and without producing any waste material.

Hence, choosing an AM technology for production provides great benefits for the entire production value chain. The geometrical freedom allows you to engineer/design your part as you envision it, without manufacturing constraints. This can be translated to extreme light-weight designs, reduced part counts or improved bone ingrowth for a medical implant. It is also a fast production route from CAD to physical part with a very high material utilization and without the need to keep expensive castings or forgings on stock.

In addition to its cost-efficiency Additive Manufacturing is, due to its high material utilization, a very energy-efficient and environmentally friendly manufacturing route.

http://www.arcam.com/technology/additive-manufacturing.aspx


9 posted on 12/23/2012 5:47:23 AM PST by Liaison
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican
And did you scheming Obammunist tools at DHS note the 3-D printed guns are made of plastic?

3-D printing technology can also make things out of metal. As I understand it, the process involves fusing powdered metal into a solid shape.

10 posted on 12/23/2012 5:48:08 AM PST by wideminded
[ Post Reply | Private Reply | To 1 | View Replies]

To: Liaison

I never said that it was not expensive now but in with future iterations of this or similar systems anything can be made. “Easy Bake” weapons but chroming the barrel and other processes will still be needed.


11 posted on 12/23/2012 5:51:58 AM PST by Liaison
[ Post Reply | Private Reply | To 9 | View Replies]

To: Reaganite Republican

>>fwiw, in the 1940s the US Army found plenty value in distributing one-shot, throwaway guns to aid the European resistance behind Nazi lines, more here...

The Liberator was shipped with 5 rounds of .45ACP. There’s a big difference betwen single-shot and one-shot.


12 posted on 12/23/2012 5:54:32 AM PST by Bryanw92 (Sic semper tyrannis)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

Watch what will happen in countries with limited or no firearms access. What does a criminal care if he uses a printed gun for a crime. A criminal stealing or trying to stop the local corrupt government is the same in an authoritarian society.


13 posted on 12/23/2012 6:03:34 AM PST by Liaison
[ Post Reply | Private Reply | To 1 | View Replies]

To: SampleMan

you are pointing to an engineering problem ~ making better ammunition ~ that is, ammunition that works well in a printed firearm. Currently the tests are being conducted with ammunition that works well in an all metal firearm ~ obviously it’s the wrong stuff.,


14 posted on 12/23/2012 6:14:17 AM PST by muawiyah
[ Post Reply | Private Reply | To 3 | View Replies]

To: Reaganite Republican

As a small scale modeler the 3D printer is like the Holy Grail of devices, instead of buying a plastic model kit you just get the software and the material and it makes your parts. The perfect retiree at home manufacturing plant.

Even with a plastic part you could attempt whats called a lost wax casting, you place your part in a casting sand box and you pour metal into the mold, it burns out the wax part but leaves you your part in metal, after some cleaning amd fitting you have your part in metal.


15 posted on 12/23/2012 6:20:27 AM PST by Eye of Unk (A Civil Cold War in America is here, its already been declared.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Norm Lenhart

“Because of the sheer number of guns and people determined to keep them, the Admin will run out of police military and whatever else before a fraction of them will actually be confiscated.”

Not really. All they need is registration and they will get
them through other means.
You want a drivers license? turn in your guns.
you want medical attention? “
you want a tax return?
a bank account?
electricity, water, gas?
Public school for kids?
Etc..


16 posted on 12/23/2012 6:23:30 AM PST by Slambat (The right to keep and bear arms. Anything one man can carry, drive or pull.)
[ Post Reply | Private Reply | To 8 | View Replies]

To: muawiyah

“ammunition that works well in an all metal firearm ~ obviously it’s the wrong stuff.,”

Self propelled caseless ammunition like a small rocket.


17 posted on 12/23/2012 6:27:32 AM PST by Slambat (The right to keep and bear arms. Anything one man can carry, drive or pull.)
[ Post Reply | Private Reply | To 14 | View Replies]

To: Reaganite Republican

Lets get real...For what it would cost to buy a 3D plastic printer you could get 100 guns from your local gangbanger...let alone one that uses powderized metal for the price on that and the per unit cost for guns you would produce you would make Fast and Furious look silly.

Now lets talk about the price of ink cartridges..


18 posted on 12/23/2012 6:27:47 AM PST by mosesdapoet ("A voice crying in the wilderness make streight for the way of the Lord")
[ Post Reply | Private Reply | To 1 | View Replies]

To: Slambat

You are correct, Obama will make it mandatory that for you to do anything you will have to give up your registered weapons.

Need a passport? Turn in your guns first.

Need to renew your license? Turn in your guns first.

So obviously what needs to be done is to get your guns de registered to you. get rid of the paperwork connection, list them as sold, lost or destroyed, take photos for evidence.

In the near future private sales will explode, that is the time to stock up. No records for some agency to use against you. They hate that.


19 posted on 12/23/2012 6:30:49 AM PST by Eye of Unk (A Civil Cold War in America is here, its already been declared.)
[ Post Reply | Private Reply | To 16 | View Replies]

To: Reaganite Republican; All
hmm..it's come to this...
(freedom of the press / ability to defend..protect ones' self / to assemble
/ rights to private property / equality in the eyes of the law..BoRs)

ALL GONE by proclamation of 0'Buttcrack's E.O.
...what did Ben Franklin say, "about freedoms and ability to keep it"
have WE all evolved into just a bunch of sheep? :-(
...exception; here @ FR (& @ a few other sites :)

20 posted on 12/23/2012 6:36:04 AM PST by skinkinthegrass (Who'll take tomorrow,spend it all today;who can take your income & tax it all away..0Bama man can :-)
[ Post Reply | Private Reply | To 1 | View Replies]

To: SampleMan

I’ve reloaded enough shotgun shells to know what a pain in the butt that must be


21 posted on 12/23/2012 6:37:24 AM PST by Reaganite Republican
[ Post Reply | Private Reply | To 3 | View Replies]

To: wideminded

I have seen sintered titanium, used in jewelry. Not very impressive: rough and brittle.

Can an engineer chime in, here? Has this process been improved?


22 posted on 12/23/2012 6:40:57 AM PST by reformedliberal
[ Post Reply | Private Reply | To 10 | View Replies]

To: Reaganite Republican

New explosives-—Makes the idea of the letter bomb more real or new ammunition:

Invention: Exploding ink

A very unusual ink-jet printer cartridge, containing explosive ink, has been patented by Qinetiq, the commercial spin-off of the British Ministry of Defence.

The ink is a mixture of very fine aluminium particles, each 1 micrometre in diameter, particles of copper oxide 5 micrometres wide, epoxy varnish and alcohol. The ink is stable in liquid form, making it safe to print onto conventional paper, but forms an explosive fuse once dry.

An engineer can easily sketch out a printable fuse using computer imaging software, modifying the delay in milliseconds by changing the length, thickness and pattern of the line on the paper...

New Scientist
14:00 07 February 2006 by Barry Fox

http://www.newscientist.com/article/dn8690-invention-exploding-ink.html


23 posted on 12/23/2012 6:41:54 AM PST by Liaison
[ Post Reply | Private Reply | To 1 | View Replies]

To: Slambat

And how long do you think that would happen before people began CW2?

Not very I think. Those kinds of restrictions would see Anarchists becoming our best buds. That’s a WHOLE different world you’re talking about and no people on earth would willingly go along with it. In a couple more liberal generations perhaps. But not yet.


24 posted on 12/23/2012 6:45:23 AM PST by Norm Lenhart
[ Post Reply | Private Reply | To 16 | View Replies]

To: Eye of Unk

Need to renew your license? Turn in your guns first........................................ I sold it at a yard sale, or it was stolen years ago, I just noticed it was gone. Not a problem, I keep it in the trunk of my car, oops, its not there where I left it.


25 posted on 12/23/2012 6:46:12 AM PST by Bringbackthedraft (Who we elect is not as important as who they bring in with them.)
[ Post Reply | Private Reply | To 19 | View Replies]

To: Reaganite Republican

Lets just call these things what they are:
3-D Assault Printers


26 posted on 12/23/2012 6:46:32 AM PST by Ouchthatonehurt
[ Post Reply | Private Reply | To 1 | View Replies]

To: Norm Lenhart

As an addition, I’d call 50 million plus unemployed, hungry with no future people the largest gurella army the world has ever seen.

The largest well armed G-army. How many cops and military do you believe will try fighting it when it’s made up of their sons, daughters, fathers, mothers, wives and husbands?

How long does the current powerstructure survive as a governing entity in that environment? And how long would it be before China/Russia landed troops of their own?


27 posted on 12/23/2012 6:53:03 AM PST by Norm Lenhart
[ Post Reply | Private Reply | To 24 | View Replies]

To: Norm Lenhart

Don’t forget that many who might hand over their weapons, could after the fact easily burn down the houses of the jack booted thugs who took them away. In other words, make their lives a living hell. You couldn’t pay me enough to be the local gun confiscator.


28 posted on 12/23/2012 6:59:57 AM PST by GnL
[ Post Reply | Private Reply | To 8 | View Replies]

To: backwoods-engineer

And, using the same “logic” they apply to gun control, next they will want to ban 3D printers.


29 posted on 12/23/2012 7:00:04 AM PST by bigbob
[ Post Reply | Private Reply | To 5 | View Replies]

To: Reaganite Republican

This won’t stop them.

Their solution will be 3D printer control and registration.


30 posted on 12/23/2012 7:10:32 AM PST by Age of Reason
[ Post Reply | Private Reply | To 1 | View Replies]

To: GnL

Exactly.

People REALLY need to study history. This BS always ends in blood and fire. And most of the people who rebelled were not losing nearly what the average American would be.

If I’m wrong, then we are far more pathetic as a people than the MSM makes us out to be. But I’m not wrong. And history has already proven it.


31 posted on 12/23/2012 7:12:28 AM PST by Norm Lenhart
[ Post Reply | Private Reply | To 28 | View Replies]

To: Slambat

Or, a dramatically improved chemical combustion at a far lower temperature ~


32 posted on 12/23/2012 7:13:09 AM PST by muawiyah
[ Post Reply | Private Reply | To 17 | View Replies]

To: Reaganite Republican
First of all, there's no doubt that 3D printing is the future of pretty much everything, guns included and I'm all for anything that accelerates the development of this technology.

Secondly: The AR15 that was printed fired 6 rounds. that's fantastic. The next one may fire 10 rounds. And after that, 20 rounds. and eventually, a virtually indestructible polymeric weapon will emerge and material costs will decrease. This is the future of everything.

Lastly, should they manage to get this ban through, we will adapt, we will improvise, and we will most certainly overcome. We will do this because we are Americans and that is our nature. This ban will not stop us, it will inspire us and propel us to the next level of weapons development.

33 posted on 12/23/2012 7:19:15 AM PST by RC one (From My Cold Dead Hands.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Reaganite Republican

$500 Solidoodle 3D printer
http://www.solidoodle.com/
http://www.freerepublic.com/focus/news/2970084/posts?page=15

3D-Printed Weapons & the Consequences
http://www.designnews.com/author.asp?section_id=1394&doc_id=255741
An AR-15 lower receiver is 3D printed and used to fire 200 rounds without catastrophic failure.

3D print your own personal electronics
http://www.designnews.com/document.asp?doc_id=255795


34 posted on 12/23/2012 7:24:08 AM PST by Haddit
[ Post Reply | Private Reply | To 1 | View Replies]

To: SampleMan

If it comes to that, it will be a matter of making every cartridge maximally lethal-it will be necessary to make bullet proof vests absolutely obsolete IOW.


35 posted on 12/23/2012 7:31:21 AM PST by RC one (From My Cold Dead Hands.)
[ Post Reply | Private Reply | To 3 | View Replies]

To: RC one

One man and a lathe can do wonders.

Pretty soon the libs run out of things to ban. But it will never get as far as people think. Bad, yes. Very bad? Yes. But eventually people have enough. Whether it’s here or France a couple hundred years back.

And then ‘WE’ run the show when it falls apart. Because ‘we’ are not libs. We know how to build, we know how to survive ‘camping’ without microwaves...all of it.


36 posted on 12/23/2012 7:41:30 AM PST by Norm Lenhart
[ Post Reply | Private Reply | To 35 | View Replies]

To: Reaganite Republican

Simple. Just ban any machine capable of making a gun. Ahem.


37 posted on 12/23/2012 8:12:47 AM PST by SkyDancer (Live your life in such a way that the Westboro church will want to picket your funeral.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Haddit

From an investor perspective, 3D printing is the next huge technology. The firearm articles just show the incredible potential as this technology evolves for all types of design and manufacturing. Those investing now will reap big returns!


38 posted on 12/23/2012 8:30:25 AM PST by aimhigh ( Guns do not kill people. Planned Parenthood kills people.)
[ Post Reply | Private Reply | To 34 | View Replies]

To: aimhigh

I’ve been drawing in 3D for the last 20 years and can see where you draw up a part once and sell it like an app over and over again for 99 cents. Sounds like a great work-at-home strategy since I’ll get my first Social Security check early next year. My wife has already given me permission to use the first check on a printer.

The plastics are now selling in differing hardness from soft to hard, translucence to opaque and some of the printers are coming with multiple print heads so you can combine the materials such as in a tail light.

Here are some free examples of Stl files
http://www.3dvia.com/search/?search%5Bcurrent_page%5D=17&search%5Bresults_per_page%5D=12&search%5Bsort_order%5D=Rank&search%5Bformat%5D=stl&search%5Bfile_types%5D=1&search%5Bquery%5D=


39 posted on 12/23/2012 9:13:49 AM PST by Haddit
[ Post Reply | Private Reply | To 38 | View Replies]

To: muawiyah

This 3D printing issue is a non-starter. Its easier, cheaper, and faster to make firearms with readily available machining tools.

Start sorting out how to make smokeless powder, primers, and cases.


40 posted on 12/23/2012 9:20:51 AM PST by SampleMan (Feral Humans are the refuse of socialism.)
[ Post Reply | Private Reply | To 14 | View Replies]

To: SampleMan

That’s old tech.


41 posted on 12/23/2012 9:31:43 AM PST by muawiyah
[ Post Reply | Private Reply | To 40 | View Replies]

To: SampleMan
Here's the situation ~ we are rapidly moving toward a day when we are as good at building metal-like layered products as easily as a termite hardens its jaw ~ by adding metal nano particles ~ check up on termites eating gold nano particles and excreting them since they wanted zinc and copper ~ eventually there's quite a bit of gold in a termite nest eh!

That's where this 3D printing is going ~ where the bugs have been for hundreds of millions of years.

We can also put a 'mind' in the bullet ~ currently the correct positioning of the weapon, and techniques for estimating wind-age result in a bullet hitting the target.

Now, turn that bullet into a server driven device with an internal direction adjustment device (there are some designs for micro miniature inertial guidance systems that seem applicable).

Put that on the 'bullet' and all at once you don't need so many bullets ~ and maybe you can make it a bit larger and add explosives ~ plus you can steer it from the firearm!

Your firing platform could start looking remarkably like your cellphone or pad. The firing mechanism might tend toward looking like one of those plastic holders for the screwdriver blade attachments. The bullet could look like whatever you liked from a jellybean to a pencil!

All the parts could be ginned on your 3-D printer. I think even low heat layered sequential burning propellants could be easily manufactured with your own home-printer ~ replace the explosion with a longer burn and you get to the same target ~ with a computer controlled internal inertial guidance every single time.

FUTURE EVENT: Officer ~ don't show me your wallet, Driver ~ ok officer ~ that's just my tool box, Officer ~ don't open it. Officer ~ keep your mouth closed.

42 posted on 12/23/2012 9:46:42 AM PST by muawiyah
[ Post Reply | Private Reply | To 40 | View Replies]

To: backwoods-engineer

the NYC effete elites fear the citizens.

The obama zombies fear losing their free stuff.


43 posted on 12/23/2012 10:34:01 AM PST by longtermmemmory (VOTE! http://www.senate.gov and http://www.house.gov)
[ Post Reply | Private Reply | To 5 | View Replies]

To: aimhigh

this is why the age of composits is upon us.

the “on demand” production is at home.

Imagine what 3d printing does to countries that need to sell their cheep labor.

Imagine what happens when production can be one off without the need for unionized labor.

it is not the specific item, it is the ABILITY TO PRODUCE which is a threat to government.

It is just a horrific to the DC country club as a country without a monarchy was over 200 years ago.


44 posted on 12/23/2012 12:05:57 PM PST by longtermmemmory (VOTE! http://www.senate.gov and http://www.house.gov)
[ Post Reply | Private Reply | To 38 | View Replies]

To: wideminded

Sintered metal has been around for a long time. Carbide cutting tools and certain wear parts are made from powdered metal mixed with a binder. In essense the mixture gets baked and finish-ground, often with diamond grinding wheels.

With 3-D printing you could make the “pre-forms” very rapidly. I think that for the near-future your still looking at needing a tool shop to grind the semi-finished part coming off the 3D Printer.


45 posted on 12/23/2012 1:25:00 PM PST by Tallguy (Hunkered down in Pennsylvania.)
[ Post Reply | Private Reply | To 10 | View Replies]

To: Tallguy
Was walking down 6th Ave in Manhattan the other day and saw a “pop-up” 3D printing store ( www.3dea.com ). It was too early for it to be open, but I spent some time window shopping thinking this is really cool. You were able to design and print your own gifts, wonder what would happen if you printed a Glock.
46 posted on 12/23/2012 1:35:20 PM PST by Woodman
[ Post Reply | Private Reply | To 45 | View Replies]

To: Tallguy

The correct link for my post is www.3dea.co Sorry.


47 posted on 12/23/2012 1:36:41 PM PST by Woodman
[ Post Reply | Private Reply | To 46 | View Replies]

To: Woodman

They opened one up here in Pasadena, Ca too.


48 posted on 12/23/2012 2:28:22 PM PST by Haddit
[ Post Reply | Private Reply | To 46 | View Replies]

To: wideminded
3-D printing technology can also make things out of metal. As I understand it, the process involves fusing powdered metal into a solid shape.

While metal, the finished part is far from solid and is relatively porous and not all that strong in tension or torsion. One could look to conventional powdered metal fabrication for some help here. Powdered metal parts have been around a lot longer than 3-D printing. Compacting the powder in a die yields a "green part" which has almost no strength. Green parts are "sintered" by heating in a hydrogen atmosphere to just under the melting point of the metal used. The 3-D part is at about the same strength at this point as the more conventional PM part.

The PM part undergoes some slight shrinkage when sintering and may be brought to final dimensional form by re-striking it in a finishing die, forging the final part to finished dimension, increasing it's density and strength.

For the highest strength parts you may take the re-forged part and pass it thru a furnace in contact with a small copper block. Furnace temperature should be just above the melting point of copper with a reducing (hydrogen) atmosphere. The copper melts and capillary attraction draws the liquid copper into the porous PM part where upon cooling it brazes the powdered matrix into one solid piece.

The copper infiltration procedure could be adapted to add final strength to 3-D powdered parts to produce a stronger, near net shape part.

As an alternative I would look for plastic that could be used in the 3-D process yet remain soluble in a suitable solvent (styrene and acetone for instance). Post printing you cement on some gates and vents (made of styrene rod stock using acetone as a glue), Coating your model part with refractory plaster by dipping the model into the plaster which should be about like thick cream. Then inspect for air bubbles which should be popped with gentle blowing. Then use something like a tea strainer to dust the coated model with tiny glass beads (craft shop?? or bead blasting shop) and let air dry. Repeat five times to build up a shell. When dry dissolve the pattern with the solvent. Support your dry plaster pattern in a bed of dry sand with the vents and gates facing up. Preheat the pattern to red heat and pour anything you can melt. When cooled and the plaster removed you will have a solid metal part that can hold dimensional tolerances of +/- 0.001" per inch. This form of casting technology dates back to the bronze age and was lately used by Saturn to turn styrene pellets into engine blocks.

Regards,
GtG

49 posted on 12/23/2012 2:53:35 PM PST by Gandalf_The_Gray (I live in my own little world, I like it 'cuz they know me here.)
[ Post Reply | Private Reply | To 10 | View Replies]

To: AdmSmith; AnonymousConservative; Berosus; bigheadfred; Bockscar; ColdOne; Convert from ECUSA; ...

Thanks Reaganite Republican.


50 posted on 01/05/2013 4:09:31 PM PST by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
[ Post Reply | Private Reply | View Replies]

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
Bloggers & Personal
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson