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Author Topic: More 3dprinting goodness.  (Read 1265 times)

Adventurer, Explorer, Inquiring Mind.

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More 3dprinting goodness.
« on: May 20, 2013, 09:44:19 pm »

Straight from Ziff Davis, and extreme tech.

http://www.extremetech.com/extreme/156305-company-develops-new-fiber-reinforced-wood-concrete-ink-for-3d-printing

Yep, read the linky.  "Company Develops New Fiber reinforced 3d printing inks" etc etc, ad infinitum.  Enjoy.
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Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car.
Horsepower is how fast you hit the wall, torque is how far you take the wall with you.

ZooT_aLLures

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Re: More 3dprinting goodness.
« Reply #1 on: September 13, 2013, 01:08:49 am »

Aluminum or zamack isn't that hard to pour, nor is it that hard to plasma cut..........and sandwich construction works VERY well.

Both Montana and Wyoming are virtually sitting on a giant slab of bentonite, which is a perfect binder for sand to produce molds.

*grins* But don't ask me because I don't know and have neeeveer poured a pistol receiver, an AR15 lower, or a 1.25" cannon barrel using a piece of 1.25" 514 DOM for a liner, out of blown out lawn mower engines in a charcoal furnace.
Nor have I ever poured all the parts for and machined a steam engine.......

The difficult part of the AR15 lower is casting in the magwell opening(which is VERY difficult to machine due to it's depth)..........but one can use ones head and create a void in the cavity to include a simple piece of soft pine of the same width and depth as the magwell, and just pour it.............the wood will smolder and burn but the pour will solidify long before  the wood burns to a point of changing it's dimensions........by the time it cools the wood will have burned away enough to remove it with a simple thump with a mallet.

3d printers are a neat thing.........but the parts still require machining because all a 3d printer does is "poot" little blobs of plastic at the defined coordinates as written in a simple G code script.
Without any "core" there will be no square internal or external edges.

Given this...........for a production run..........injection molding is still very much superior.........because one can injection mold into a plaster cast and produce a finished product.........well, that is, until the mold breaks*L*
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Even some cowboy and indian outlaws in the 1800's eventually stopped sleeping under buffalo skins, and came to town to entertain paying customers. For some I imagine the bruising of their ego never healed.

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Rarick

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Re: More 3dprinting goodness.
« Reply #2 on: September 13, 2013, 07:56:19 am »

Printing walls for a building.  Printing plastic furniture.  Printing plastic tableware.  Simple, semi durable items are the current capability, but there are also the wire spool fed printers that can weld/sinter metal powder into solid items as well. 

When you get right down to it, the worst stresses in a firearm are the chamber/bolt assembly, keep solid billets of the alloys you need for that part of the weapon in the sizes you need.  The rest of the weapon then only needs to be good enough to handle the "Bounce" from the unlock/recoil/feed mechanism.  That doesn't have to be THAT robust if stamped sheet metal is used in a lot of those weapons...........

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........Duct tape is like the force, it has a light side, a darkside and holds the universe together.  It is theoretically reinforced with strings too.  (The dome has a darkside, lightside and strings of rebar for reinforcement too!)
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Most of the time news is about the same old violations of the first principles of consent and golden rule with a dash of force thrown in........ with just enough duct tape to be believable.

ZooT_aLLures

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Re: More 3dprinting goodness.
« Reply #3 on: September 15, 2013, 12:54:18 pm »

Quote
but there are also the wire spool fed printers that can weld/sinter metal powder into solid items as well. 

Well then one might as well start with a grounded steel "seed" and put a MIG welding head on a simple CNC X,Y,Z gantry.

I did just that using a discarded steel bedframe some acme screws, McGyver-ism and my little 40amp plasma cutter.

Worked great for plate up to 1/4" mild steel, but only for smallish parts, one at a time, with a long wait between parts due to the duty cycle of the plasma cutter.
Did some 12 gauge T304 stainless too.

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Even some cowboy and indian outlaws in the 1800's eventually stopped sleeping under buffalo skins, and came to town to entertain paying customers. For some I imagine the bruising of their ego never healed.

We all have some scar tissue that never lets us completely forget the intent of the adventure.

Rarick

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Re: More 3dprinting goodness.
« Reply #4 on: September 18, 2013, 09:19:32 am »

Yep, that is about the size of it.
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........Duct tape is like the force, it has a light side, a darkside and holds the universe together.  It is theoretically reinforced with strings too.  (The dome has a darkside, lightside and strings of rebar for reinforcement too!)
-------------------------------------------
Most of the time news is about the same old violations of the first principles of consent and golden rule with a dash of force thrown in........ with just enough duct tape to be believable.
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