Note the hstory of Mars probes has been hit and miss.
It's pretty challenging.
But there is room in their plan to compensate for this.
Still a long way to go.
16330 publicly visible posts • joined 10 Jun 2009
"Does this 'polishing' involve precision machinery that removes significant amounts of metal? I'm a cynic, I know."
Depends what you mean.
"Flow honing" (abrasive embedded in very small polystyrene beads) is used to reduce the surface finish of gas turbine blades from 64 to 16 micro inches (1.22 micrometres) using essentially a spray system while electrochemical polishing give an optically reflective surface IE surface finish of a 1/2 micrometre removal.
That's about 1/50 to 1/25 of 1 thousandth of an inch. I'd call it minor (although that blade polishing is expected to save something like 2% of the engines fuel over the life of the engine).
"Higher end Commercial 3D printers can reliably output to about .0005 but beyond that their output falls off exponentially. "
That's 12.7 micrometres or 1/2 a thou. To be clear I once read the the difference between a car engine that runs smoothly and one that leaks oil is roughly 50 micrometres.while the typical surface finish, even of things like turbine blades, is around 1.625 micrometres (64 micro inches). I'll also note that non specific polishing techniques exist (using small plastic beads with embedded abrasives to deliver very gentle, very precise surface finish without special tooling), giving a surface finish of 16 micro inches.
Laser sintering will be complementary to other techniques. The challenge is to play to it's strengths, such as making holes (or closed cavities for lowering weight, which is virtually impossible to do with other ways), in the way that using carbon fibre as "Black Aluminium" is a poor use of its properties and that parts really need to be re-designed to accommodate it.
The challenge is it's speed. It's strengths are a)Flexibility b)Properties variable by varying the feedstock c)Ability to mfg variable density materials.
These suggest integration of multiple parts into a unified, lighter element is the way to go.
"I'd been wondering when it'd be possible for 3D printing technology to be more precise than machine technology. "
There were reports of F1 teams laser sintering gears about a decade ago.
I don't know how much finish machining was involved but the basic structure was done in the laser system.
Note that like all additive processes "holes" are cheap but solid (especially full density) is expensive.
So all those nice multi colour FEA plots showing stress patterns can act as a guide for the next generation part.
In principal the resolution is set by 3 things. 1)Laser wave length 2)Ability of optical system to deliver a diffraction limited spot 3)Size of metal grains. These can be into the 10s of nm for very fine grain chemically produced (IE expensive) powders.
Of course high power UV lasers are not exactly cheap....
Actually their tactics sound more like a "bleedout" where, essentially they run up plenty of credit, swap the goods around and the company crashes and burns.
Anyone who gets invited to "invest" in their business and can't figure out who the mug is whose going to be left holding the baby should realize that would be themselves.
Don't trust these f**kers.
Oh wait it was just one of the Telco's that GCHQ had not got round to accessing yet.
It seems there is no way to muzzle the data fetishists of GCHQ.
I will note that this is pretty poor security on both LinkedIn and Slashdot unless GCHQ had actually spoofed the page and it was not from them at all.
"Yet you have not issue giving all your info to The Regester to post comments!? The Regester wants to know my full name, email, what my occupation is, how many people are at my job, and if I make spending decisions. That seems a bit more intrusive to me, just to post a comment!"
And of course you told them the truth, and don't use expendable accounts?
I think you win the "Matt Bryant" award.
That's not a good thing to win.
1)Develop a one shot power system capable of generating the level of power needed to overcome the losses for the time required (In this field 1 milisecond is quite long)
2)Build the actual generator. We're in thyratron territory here, along with Blumein lines and other assorted jiggery pokery from the high power radar and particle accelerator (with a side order of ion thruster) crowd.
Most of which North Korea is not really well known for.
Logically you side step the inverse square law by focusing the output in a narrow cone.
Not easy to do when your power source is rapidly destroying your generator while it's working.
I'll not there things called thermal batteries that use the thermite effect to energize the reactants of a battery. They have long life (no self discharge modes as the ions and electrons don't move at room temperature) and have been quoted with power levels into the Kws (for a few seconds).
Yes you'd need to scale up the size and the duration would go down the pan but the generator part would still be intact when it was spent. Essentially you end up with a hot (possibly very hot) canister, rather than
a shrapnel cloud.
"Client" approaches lawyers claiming copyright infringement on properties they do not even own
Lawyers say "No problem" and proceed to hunt down (possible) down loaders.
Lawyers deliberately upload copies of material to encourage down loading.
How is this not a)Fraud (on the part of the shell companies) and b)Entrapment on the part of the lawyers.
And did I not read that the "clients" are proving elusive to the point that they appear to have been set up by the lawyers themselves?
This looks like grounds for criminal prosecution and disbarment of all concerned.
It's the conference proceedings of a pulsed power conference.
Explosive generation is challenging.
The problem is twofold. a)Generate b)Direct the result.
Viable? Yes. Practical? maybe. Viable in a country of N. Korea's industrial base? Unconvincing.
"The check by AIPAC is in the mail, Mister CIA Director. You can stop trying so hard."
True.
Field portable munitions were developed in the early 60s in the US. IIRC they are very small yield (0.25 to 1 Kt) and designed for behind the lines emplacement by special forces, so Lewis Page sized but no smaller.
The trouble a lot of the tricks to reduce the Pu or U needed involve wrapping the core in various (heavy) materials. Simple answer. Scrap them, hence small (but still serious by conventional standards) yield.
The ultimate expression of this was the "Nuclear Six Shooter" which IIRC I traced to an early 60's Pop Sci article on "Weapons of the future." This lead to the idea of the "Californium bullet," based around short half life Higher trans Uranics)
The actual estimated size of the "bullet" was 5lb's!
IRL Californium has been made IIRC in microgram quantities. Short half life --> heavy radiation emission (and I think it's quite a good Neutron emitter, which needs shielding measured in tonnes even for 1gram sources).
So any hidden mini nuke (as they called them back in the day) has probably turned (mostly) to lead by now.
The story to the movie "The Peacemaker" is slightlymore realistic but that's still (I think) way too light for a real one.
OTOH a dirty bomb is (potentially) more plausible...
But that's a bit too stupid for people to deal with.
With 26 logins Snowden is king spook!
Seriously. Are you f**king kidding me? 26 people gave up their log ins without question?
I know Snowden was a contractor and probably most of the people he worked with were also contractors but I find it impossible to believe they did not know who they were working for or the level of discretion was needed.
"For software that costs ~ £5k / seat it has some serious shortcoming when it comes to actually spitting out useful G code."
I'm wondering if the "art" in it's name suggest it's more "artistic" and hence more for representation (More Autosketch than Autocad)?
But perhaps I can help with your G code
It used to (and for all I know still does) have it's own tool room for mfg press tools and dies (somewhat more unusual than a pinball machine in a software house).
It employed the Ukranian nutjob extremist who set off 3 bombs and murdered a Moslem man in his 80's as he wanted to start a "race war" in the West Midlands.
Presumably the Ukraine has plenty of ethnic unrest to be getting on with.
IIRC they are quite adept at "inverse" design. You design the part (in Autocad, Pro Engineer etc) then feed it through Delcam and it designs the sheet metal press tools and dies to make it, with varying levels of human intervention.
Is it possible the malware writers are looking for malware as well?
So they can hijack it if it's better at being malicious than their code?
Possibly because it has a special "Official Govt Malware, please ignore" tag?
Surely not.
Stuxnet. The perfect weapon. And the Iranians will never be able to turn it against us.
That worked out real well too.
Trouble is neither of them seems to have dialed it down since.
If they were honest they'd say "We couldn't spy on everyone 24/7/365 because the technology was not up to it not because we didn't want to. But now the tech is up to it, so we can."
Funny how spooks away play the "Nothing to hide, nothing to fear" card is it not?
Politicians should all know the reply is "Give me 6 lines from an honest man, and I'll find something to hang him."
Note the "crime" in the latter case is simple. I don't like him.
And that's his only crime. The rest is simply finding a "legal" excuse to hang him.
"Yes, a few radicalized minds have said Snowden is a patriot and not a terrorist. But I ask you, do you feel safer after that bad man Snowden leaked National Secrets endangering National Security? Do you feel safe? You don't! He's spreading fear! Terrorist I say! Burn him! Burn him!"
Nice parody.
Have an upvote.
Yeah we can't track these people because of Snowden giving the game away.
What utter BS.
As we found out OBL could not be found because he did not use electronic media.
I think most of the real terrorists already strongly suspected this.
Still there's always the rest of us.
Literally the last words in the statement, which you would probably not even read.
Understand something about all corporations.
They have no built-in ethics or morals beyond if-its-ilegal-dont-get-caught.
These apparent characteristics are created by the human staff that run them over time. So over time a corporation could change from okay-to-deal-with to rob-the-corpses-of-the-dead.
IOW A fish rots from it's head.
Both the Transputer and (IIRC) ARM have this. Apparently it's a really useful tool for cryptography.
In fact so sensitive is the subject that at least one textbook (Combinatorial Algorithms:Theory & Practice) describes a fast non lookup (LUT's get expensive over maybe 8 bits, especially if you wanted to have lots of parallel processors. Not saying the NSA has a huge bank of FPGA's doing that of course) method only by example, rather than a detailed algorithm with illustrations, as they do with the simpler methods.
The radical shift in description suggested someone had whispered in their ears.
I'd be very surprised if Intel did not have spare capacity in their on chip microcode ROMs or PLA's for additional capability. When you've spent $3Bn on a line you'd want to keep it running. The easy way to do that is to add stuff into areas designed to be changed, rather than re jig the chip layout.
Let's see.
Welfare State founded 1948.
Computerization started?? Say 50+ years. IBM & ICL mainframes (probably COBOL and proprietary add on stuff). Porting to some other platforms?
BTW those 6 benefits are (IIRC) the headline list. In fact we're talking about maybe 200 benefits.
In 200 systems. With (potentially) 5 000 000 (for very common benefits paid to individuals) records
Hint. A smallish system can run 50 data files with 100s of indexes over them.
Bottom line. Any project manager who understands this and still does not want to bail out is a)Very stupid or b) Has a very big set on them.
Well Beechams and Smith Kline were IIRC.
The problem is the modern UK VC view. Get something that does not quite suck and sell it off to someone who wants to be a global player.
And repeat.
It take vision to want be be more than a research team and confidence that you can be more, in fact be a global player.
Maybe one that even invests in US teams but banks their IP results int he UK.
So everything get re-written with some assumption that X would never change turns out to be so much BS.
Taxes. Never going to change pretty much every thing about them (what, what is applied to what, how the "what" is calculated).
I'll note that while the UK does not have FAR I'm quite sure they have some equivalent pile of BS to work through, most of which to the average SME look like stereo instructions.
Maybe people will have a better idea of what they want before they start ordering it be built ASAP.
I've had a sh**ty day and I can hope tomorrow might be a better one.