PROTEST National Defense Authorization Act

15 12 2011

We are on the verge of loosing the right to habeas corpus in America.

The National Defense Authorization Act of 2012 was passed by the House last night and the president is expected to sign it into law.

Forbes has a good article on the threat this law poses to civil liberties in the United States.

This law allows the US  government to indefinitely detain US citizens without trial.

If the government doesn’t like you… they can brand you a terrorist and make you disappear.

This makes every US citizens vulnerable to unjust prosecution.


I will be at Zuccotti Park  40 Foley Square NYC protesting today.



Information on the NDAA has been tough to find with lots of confusion on the internet.

Lawfare has a great FAQ that gets into the subtleties of the NDAA.


UPDATE: President Obama has signed the National Defense Authorization Act into law.


13 12 2011

All photos.

Today I did another test of the CRT based electron gun in the vacuum chamber.

Spoiler alert: I didn’t see an electron beam.

This time I put a grounded piece of phosphor right in front of the beam path:


Here is a closeup of the grounding wire:

I printed the phosphor holder with 1% infill so it’s basically hollow, then I drilled it with holes to allow gas to escape:


The vacuum reached 1.66 millitorr which is not amazing, but good enough for this run.

I tested the wiring with the unbroken CRT, and it looked good:


Then I wired the power supply to the vacuum chamber feedthrough:

The I fired it up, you can see the hot cathode working:

But no beam.


Just Look at this Print

5 12 2011

All photos.

Previously I tested out the electron gun and I didn’t see a beam on the phosphor. I wanted to rule out the possibility that there WAS a beam, but it wasn’t hitting the phosphor screen. By moving the screen closer I can see the beam no matter where it is pointed.

So I designed and printed this sweet phosphor holder:

I have a small piece of broken phosphor glass from the CRT. I used the excellent OpenSCAD polygon editor to make a form fitting mount:

In real life:

That was easy!

Vacuum Chamber Armature

1 12 2011

All photos.

Today I used the MakerBot to print an armature mount for the vacuum chamber.

The ring is larger than the build platform, so I made four pieces that dovetail together.

I used Jag’s dovetail library.

The MakerBot makes it ok to fail. I went through five designs before I arrived at this one that works. But that’s ok!

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