2nd generation

Giant South African 3D printer prints another printer


Towards the end of last year I wrote about South African inventor and chocolatier par exellence Hans Fouche, a man who has been at the forefront of 3D print tech for some years. When I interviewed Hans at his factory, I was really impressed by his hand built machines capable of printing chocolate designs to more or less any specification or request.
Oddly enough, though, I hadn’t planned to write about chocolate at all when I met Fouche. A few weeks prior to my factory tour, he’d told me about a 3D printer he had built that was the size of his garage. When I interviewed him, however, that printer wasn’t working – but the magnificent chocolate factory more than made up for it.
Now, Hans sends word that not only is his garage sized printer up and running, but he’s using it to spew out enormous designs far beyond the realm of possibility for your humble MakerBots et al. In fact, he’s even printed the entire frame for a RepRap Morgan – yet another South African 3D print innovation we’ve featured extensively here.
A prototype printed briefcase made on the giant machine.
A prototype printed briefcase made on the giant machine.
Why is this a big deal? Because the dream of the entire RepRap project is to make a 3D printer that doesn’t require ‘vitamins’ – those extra parts like nuts and bolts that you have to buy when assembling current designs – so that if you have one printer, you can make as many more as you need. As far as we’re aware, the Morgan frame Fouche has printed is the most complete chassis yet.
According to Fouche, it only took seven and a half hours to print the entire Morgan frame in three parts, and unbelievably, it’s solid enough to use as-is without any extra reinforcement. Compare that to the two weeks or so it took me to print out enough parts to make a Morgan using a normal size printer. Among other things Fouche has printed so far include wheels for a wheelbarrow, ladies shoes, flip flops and a fully working briefcase. Because of the size of the printer and the feedstock used, Fouche’s invention creates thick, rope-like patterns in every layer – an aesthetic which he’s hoping to use when he commercialises the design, printing designer ‘things’ at a previously unimagined scale.
Want to know more about terms like ‘feedstock’, ‘RepRap’ and ‘MakerBot’? Check out our guide to the basics of 3D printing here.
And here’s that RepRap Morgan in full.
morgan
[Images - Fouche 3D printing]

Risk of nuclear war ‘rising’

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Opinion » Comment

Updated: May 1, 2014 00:41 IST

Risk of nuclear accidents ‘rising’

Julian Borger
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A report recounting a litany of near-misses in which nuclear weapons came close to being launched by mistake concludes that the risk of potentially catastrophic accidents is higher than previously thought and appears to be rising.
Too Close for Comfort: Cases of Near Nuclear Use and Options for Policy, published on April 29 by Chatham House, the international think-tank based in London, says that “individual decision-making, often in disobedience of protocol and political guidance, has on several occasions saved the day,” preventing the launch of nuclear warheads.
The report lists 13 instances since 1962 when nuclear weapons were nearly used. In several cases the large-scale launch of nuclear weapons was nearly triggered by technical malfunctions or breakdowns in communication causing false alarms, in both the U.S. and Russia. Disaster was averted only by cool-headed individuals gambling that the alert was caused by a glitch and not an actual attack.
The Chatham House authors say the risks appear to be rising. Nuclear weapons are spreading — most recently to North Korea — and disarmament is stalling. Russia and the U.S. still have an estimated 1,800 warheads on high alert, ready to launch between five and 15 minutes after receiving the launch order — a fact that becomes all the more significant with rising tensions over Ukraine.
“The question today is: are these risks worth it?” said Patricia Lewis, Chatham House research director for international security and one of the report’s authors. “You can imagine a situation in which tensions rise and signals come in and people misinterpret what is going on. Will people always have sound enough minds to take the time to make a reasoned decision?”
The mental state of some of the leaders who had their fingers on the nuclear button has sometimes been a source of worry. Richard Nixon and Boris Yeltsin both raised concerns among their top advisers with their heavy drinking. In May 1981 the newly elected French President, Francois Mitterand, left the French nuclear launch codes at home in the pocket of his suit. President Jimmy Carter did the same in the 1970s, and the suit as well as the codes were taken to the dry cleaners. The U.S. launch codes went missing again when Ronald Reagan was shot on March 30, 1981. FBI agents had them, along with the injured President’s bloodied trousers.
The report focusses on cases in which nuclear weapons came close to being launched deliberately on the basis of bad or incomplete information.
However, there is an additional risk of accidents inherent in the maintenance of stockpiles of more than 17,000 warheads held by Russia, the U.S. and the other seven nuclear-armed states. Some of those accidents were described in a book published last year, entitled Command and Control. Author Eric Schlosser gives an account of an incident in September 1980 in Arkansas in which a maintenance engineer dropped a socket wrench into a silo holding a Titan II nuclear missile, igniting its fuel and triggering an explosion which sent the warhead flying. It landed near a road but did not detonate.
These are some of the incidents that illustrate how close the world has come to accidental nuclear apocalypse: Washington, June 1980: A faulty computer chip triggered a nuclear attack warning on the U.S., giving the impression that more than 2,000 Soviet missiles were on the way.
Cuban missile crisis: In October 1962, four nuclear-armed Soviet submarines were deployed in the Sargasso Sea at the height of the Cuban missile crisis. U.S. warships had warned Moscow that they would be practising dropping depth charges, but the message did not reach the submarines. With his communications cut off and believing himself under attack, one commander ordered a launch of nuclear warheads, declaring: “We’re going to blast them now.” He was persuaded to desist by his second-in-command.
Soviet Union, 1983: Shortly after midnight on September 25, an alert sounded at a Soviet satellite early warning station. The data suggested five intercontinental ballistic missiles were heading towards the country. Lieutenant Colonel Stanislav Yevgrafovich defied protocol by not reporting the incident to his superior, gambling that it was a false alarm. It turned out that sunlight glinting off U.S. territory had confused the satellite.
Russia, 1995: On January 25, Norwegian scientists launched a Black Brant rocket to study the aurora borealis over the Svalbard region. They warned Moscow but the message never reached the radar operators at the Russian early warning stations, who mistook the rocket for an incoming Trident submarine-launched missile. President Boris Yeltsin was discussing his decision with his top military commander when the rocket fell wide of Soviet territory. (Julian Borger is The Guardian’s diplomatic editor.)
© Guardian Newspapers Limited, 2014 
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General Hamid Gul former ISI Head, Unit of Pakistan Army ...






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hamid gul, former head of isi, a unit of pakistani army threatens nuking India's silicon valley bangalore ...
 

A test to tell if you're at risk of early death

LONDON: Scientists have found that the ability or inability to stand up on one leg can indicate which 53-year-olds are at risk of premature death.

Fifty-three-year-old men who could balance on one leg for more than 10 seconds and stand up and sit down in a chair more than 37 times in a minute were found to be least likely to die early. Women in the same age group who could stand up and sit down more than 35 times in a minute and stand on one leg for more than 10 seconds were also in the low-risk category.

The researchers led by Rachel Cooper at the Medical Research Council Unit for Lifelong Health and Ageing at University College London examined the associations of grip strength, chair rise speed and standing balance time at age 53 with death rates from all-causes over the following 13 years. The survey has been tracking the health of over 5,000 people since their births in 1946.

Low levels of physical capability - in particular weak grip strength, slow chair rise speed and poor standing balance performance have been found to accurately indicate poorer chances of survival over the next 13 years while greater time spent in light intensity physical activity each day is linked to a reduced risk of developing disability in adults. Those with poor grip strength, chair rise speed and standing balance time at the age of 53 had over 12 times higher death rates.