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Inner Grid Rings and High Voltage Feedthrough

Posted: Wed Feb 14, 2018 1:07 pm
by Caine Ardayfio
Hello Fusioneers,
I was wondering how I would connect the inner grid to a high voltage feedthrough. I have soldered a machine screw to the inner grid attached like the picture attached. How would I go about connecting this inner grid to the feedthrough?
-Caine

Re: Demo vs Non-Demo Nuclear Fusion

Posted: Wed Feb 14, 2018 1:31 pm
by John Futter
Caine
this is not spoonfeeding 101
this question should have been asked in the New User Chat Area.
If you had read all the faq's you would already know the answer

Re: Inner Grid Rings and High Voltage Feedthrough

Posted: Wed Feb 14, 2018 2:08 pm
by Caine Ardayfio
I changed my question to be more specific now.

Re: Inner Grid Rings and High Voltage Feedthrough

Posted: Wed Feb 14, 2018 3:51 pm
by Richard Hull
The HV feed-thru, if professional, will have a metal rod stalk. You must internally thread that stalk with a tap & die set to match your grid's thread.

First, however, you must compute the length of stalk that will, once the grid is screwed in, center the grid within you device. This will usually mean cutting the stalk to this proper length and then threading it internally.

Using a non-professional feed-thru, you will have to create a threaded stalk post of proper length.

Richard Hull

Re: Inner Grid Rings and High Voltage Feedthrough

Posted: Wed Feb 14, 2018 5:10 pm
by Rex Allers
That grid is very pretty, but if it is tin-lead soldered together, it should be pretty much guaranteed to fall apart in a plasma. If you look around the forum you should find many pictures of tungsten grids glowing red in a plasma.

I think most grids that have been used are some kind of bent wire clamped together at the connection point.

Re: Inner Grid Rings and High Voltage Feedthrough

Posted: Thu Feb 15, 2018 12:53 am
by ian_krase
For demo fusors some people make a curly-cue grid out of a single SS or tungsten wire with no joints.