Posted: Tue Apr 16, 2013 12:45 pm
Mine sounds a bit more eloquent thoughjrrdw wrote:
Isn't that what I said but worded differently....
Page 332 of 443
Posted: Tue Apr 16, 2013 4:36 pm
Interesting little story about the LHC.
http://www.symmetrymagazine.org/article ... -ball-test
http://www.symmetrymagazine.org/article ... -ball-test
LHC passes ‘ping-pong ball’ test
Physicists sent an ultra-clean, miniature ping-pong ball through part of the Large Hadron Collider beam pipe to test for hidden defects.
CERN Bulletin: LHC gets the ball rolling
Sometimes the best solutions in high-energy physics research are surprisingly low-tech.
Physicists sent a carefully sterilized, slightly-smaller-than-regulation ping-pong ball through a 2-mile section of the Large Hadron Collider today. They were searching for possible defects in the connections between magnets that can arise as they change temperature.
The so-called radio-frequency ball, first developed in 2007, carried a small transmitter that allowed scientists to track its progress. It moved through simple suction, pinging every third of a mile.
"The beam pipes are fragile,” says Vincent Baglin, the leader of the LHC beam vacuum section at CERN. “We always have to check and crosscheck to minimize any problems. This is a simple test that can prevent complicated issues."
The LHC's 17-mile circumference is composed of eight straight sections joined together by eight arcs. More than 1600 magnets bend and focus the beams of particles that circle the collider at close to the speed of light. Interconnections, some of which resemble long, copper fingers, ensure that electricity flows from one magnet to the next.
These interconnections are installed at room temperature, but they must operate at well below freezing when the machine is turned on. The metal contracts by about 40 millimeters when this happens. Usually, the fingers manage to stay flat. But, occasionally, the fingers buckle, creating a bulge that can block a particle beam.
Testing this with the actual beam would be a months-long, labor-intensive process, requiring cooling down the LHC and then warming it back up again to fix any identified problems.
So scientists opt for a test that takes about 15 minutes per section instead. Rather than sending a beam through the pipe, they send the RF ball. If it gets stuck, technicians use an endoscope to look into the pipe and diagnose the problem.
The LHC passed today’s test, but it will need to pass many more before its scheduled restart in 2015.
Posted: Wed Apr 17, 2013 6:00 pm
I got these from ebay. Fixed them and life is good, right on time!
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Posted: Thu Apr 18, 2013 10:34 pm
Would like to say thank you too jrrdw, he machined a custom piston for my gun, he designed it his way , with 2 o rings nd tapped it in the front for rubber washers!!! Great man to have work done by,, def going back to him:)
Posted: Mon Apr 22, 2013 12:01 am
Excited for this!
I've seen Ozzy in concert before but Black Sabbath will be something else...
As a 14 year old, I would never have thought I'd see the day where I would get to hear the sirens of 'War Pigs' open a concert with Ozzy, Geezer, and Tony coming out on stage.
I've seen Ozzy in concert before but Black Sabbath will be something else...
As a 14 year old, I would never have thought I'd see the day where I would get to hear the sirens of 'War Pigs' open a concert with Ozzy, Geezer, and Tony coming out on stage.
Posted: Mon Apr 22, 2013 12:46 am
Sweet. Poster maker must be a fan.
Posted: Mon Apr 22, 2013 11:39 am
Made some kiridashis during today and yesterday, still needing stamps, heat treatment and final sanding and polishing. And sheats ofc. Selling these for 35€ including shipping, someone interested?
Posted: Thu Apr 25, 2013 4:19 pm
Here's the large knife, finished! Well ok, needs a lanyard hole, cleaning and better cord wrap 
Posted: Fri Apr 26, 2013 12:14 am
Oh man that is just begging to be shot out of something...
Posted: Fri Apr 26, 2013 12:57 am
Posted because I liked it and thought others might too:
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Posted: Fri Apr 26, 2013 7:16 am
here is my newest toy
3.3V @ 50mA
can't tell what's the output mW but it is a 200mW diode
[youtube][/youtube]
3.3V @ 50mA
can't tell what's the output mW but it is a 200mW diode
[youtube][/youtube]
Posted: Fri Apr 26, 2013 7:17 am
Posted: Fri Apr 26, 2013 8:41 am
Here is my beauty 
4.5mm Weihrauch HW97K synthetic stock.
Absolutely wonderful, heavy and steady. The trigger is a little heavy but maybe that's because I'm used to airsoft.
The scope isn't very good but it's the only one I have for now.
Haven't shot much, the scope isn't zeroed yet
gonna do the test shooting this afternoon 
4.5mm Weihrauch HW97K synthetic stock.Absolutely wonderful, heavy and steady. The trigger is a little heavy but maybe that's because I'm used to airsoft.
The scope isn't very good but it's the only one I have for now.
Haven't shot much, the scope isn't zeroed yet
gonna do the test shooting this afternoon Posted: Fri Apr 26, 2013 9:02 am
You can adjust itReally nice brass two stage trigger, a little heavy through.
Also, if you think that's heavy, try the Hämmerli
Posted: Fri Apr 26, 2013 9:07 am
I think it's already in the lightest positionYou can adjust it