Talk-Polywell.org

What it says:
http://machinedesign.com/3d-printing/ho ... ufacturing

The contrast is with subtractive machining. When the materials that can be additively processed are as strong as those that can be machined it will be worth talking about. This is nanotechnology we are decades away from.

You're lack of reading comprehension is really funny. These additive manufacturing parts are strong enough and accurate enough to be used without further machining.

The whole of the article directly contradicts what you just posted.

Nanotechnology has nothing to do with this.

TDPerk wrote:You're lack of reading comprehension is really funny. These additive manufacturing parts are strong enough and accurate enough to be used without further machining.

The whole of the article directly contradicts what you just posted.

Nanotechnology has nothing to do with this.

You'll save yourself a great deal of annoyance if you just ignore that ignorant and worthless f**K.

3-D Painting Goes Supersonic

Unlike welding, cold spray does not require heat, which can melt surrounding material and change the mechanical qualities of the part. The 3-D painting gun is using pressurized carrier gas zipping through a de Laval nozzle to accelerate powder particles as small as 5 microns to supersonic velocities. The speed causes localized high energy collisions when the particles hit the surface, the micro version of bullets hitting an I-beam.

“Powder particles slam into the surface and form a diffusion bond with the part,” Kebbede says. “The bond happens on the atomic level. That’s why we are so excited.”

http://www.scientificcomputing.com/news ... n0onCcazFp

TDPerk wrote:You're lack of reading comprehension is really funny. These additive manufacturing parts are strong enough and accurate enough to be used without further machining.

The whole of the article directly contradicts what you just posted.

Nanotechnology has nothing to do with this.

I'll be impressed when they can do it with metal.

Schneibster wrote:

TDPerk wrote:You're lack of reading comprehension is really funny. These additive manufacturing parts are strong enough and accurate enough to be used without further machining.

The whole of the article directly contradicts what you just posted.

Nanotechnology has nothing to do with this.

I'll be impressed when they can do it with metal.

The patents on DMLS/ SLS just ran down. It should be showing up in DIY printers 1-2 generations down the line, so 2 to 5 years max.

https://medium.com/war-is-boring/74ec18aa7ee0

I'll be impressed when they can do it with metal.

Attention Mr. Strout

If you wanted more traffic here, I'd give you the money to hire a better grade of troll.

Seriously, the troll didn't even note this is all about doing it with metal?

I'd like to see more test runs of the firearm and some ultrasonic flaw detection before and after a few thousand rounds. This is really quite remarkable and well ahead of the schedule I had expected.

GIThruster wrote:Seriously, the troll didn't even note this is all about doing it with metal?

I'd like to see more test runs of the firearm and some ultrasonic flaw detection before and after a few thousand rounds. This is really quite remarkable and well ahead of the schedule I had expected.

He doesn't read what you link to because he doesn't want to expose his mind to dirty thoughts. Or slow down his spamming.

If you point that at a cop you have about a 25% chance of living.

The printer used is a quarter million or more brand new--that's what DMLS machines tend to run, especially with this level of precision.

The people that do reprap want to make an electron beam machine, kind of like the one NASA is working on. Less precise, but the machine can more easily replicate itself since you need not worry about the gas mix in the laser. With patents expiring next year, it'll come into it's own soon enough.

The big problem is even after that, the materials are expensive--I understand the metal powders run hundreds of dollars a pound--the gun is probably a few thousand just in powder. Not sure how it's made, but that price needs to come down too to get it spread around. Printing sounds like it might be ready for my industry--oilfield machining, where pressures get into tens of thousands of pounds, and drill strings are put under over 10,000 ft-lbs of torque. Until the price of making the stuff goes down though, we'll be messing around with our lathes and mills.

The tech has a long way to go before it can compete with more traditional manufacturing methods for most stuff. Early applications are items established manufacturing has difficulty with, such as interior contours. With major patents about to expire, I expect a major drop in prices.

As far as electron beam point heating, I don't see how it has to be less precise than laser heating. The process would have to take place in a vacuum chamber. As a benefit of working in a vacuum, metals that would react if heated in air could be used.

If the metal powder used is running hundreds of dollars a pound, I suspect the demand hasn't grown enough to drive more efficient manufacturing methods.

Even if a 3D machine is expensive (price will continue to drop)

you can still make these with a decent machine shop.

As far as electron beam point heating, I don't see how it has to be less precise than laser heating. The process would have to take place in a vacuum chamber. As a benefit of working in a vacuum, metals that would react if heated in air could be used.

The problem is absorbing the electron beam. It takes a set amount of depth to absorb the energy and melt, so your layers at least are limited in how thin they can get.