Homemade Feedthrough
- Andrew Robinson
- Moderator
- Posts: 688
- Joined: Sun Aug 11, 2013 1:54 am
- Real name: Andrew Robinson
- Location: Raleigh, North Carolina
- Contact:
Re: Homemade Feedthrough
To bring things back to the friendly side Dan have you done any load testing on your DIY feed through? What is the maximum potential you are expecting to push through that thing? I'd be curious to see where it fails, especially considering the minimum surface path length. I'm curious to see what the flash over voltage is. What's the creepage distance? Looks to be about 6-8 inches or so? Looks nice. Well done.
I can wire anything directly into anything! I'm the professor!
- Liam David
- Posts: 518
- Joined: Sat Jan 25, 2014 5:30 pm
- Real name: Liam David
- Location: PPPL
Re: Homemade Feedthrough
Scratch the link to the compression fitting-They must have been bought out.
I'm re-posting because I cannot edit my previous post.
-Liam David
I'm re-posting because I cannot edit my previous post.
-Liam David
-
- Posts: 72
- Joined: Mon May 27, 2013 10:08 pm
- Real name: Jack Rosky
- Location: New Jersey
Re: Homemade Feedthrough
Looks very well done Liam!
Do you happen to have a schematic drawn up or more pictures of the assembly process. I am very curious as to how you set this up and how it looks on the grid-end of the feedthrough.
Thanks,
Jack Rosky
Do you happen to have a schematic drawn up or more pictures of the assembly process. I am very curious as to how you set this up and how it looks on the grid-end of the feedthrough.
Thanks,
Jack Rosky
If I have seen further than others, it is by standing upon the shoulders of giants.
-Issac Newton
-Issac Newton
Re: Homemade Feedthrough
What is the diameter of the conductor inside the feedthrough?
This is important as the electric field is related to the diameter or the conductor.
This is important as the electric field is related to the diameter or the conductor.
- Bob Reite
- Posts: 576
- Joined: Sun Aug 25, 2013 9:03 pm
- Real name: Bob Reite
- Location: Wilkes Barre/Scranton area
Re: Homemade Feedthrough
I'm curious as to what voltage it has been tested to. Guess I'll need to look up the dielectric strength of alumina and figure out the theoretical maximum this build can take voltage wise.
The more reactive the materials, the more spectacular the failures.
The testing isn't over until the prototype is destroyed.
The testing isn't over until the prototype is destroyed.
-
- Posts: 87
- Joined: Tue Mar 18, 2014 9:29 pm
- Real name: Jake Wells
Re: Homemade Feedthrough
This is the part # 8746K16.
http://www.mcmaster.com/#alumina/=u5afbt
http://www.mcmaster.com/#alumina/=u5afbt
“The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.”
― Nikola Tesla
― Nikola Tesla
- Andrew Robinson
- Moderator
- Posts: 688
- Joined: Sun Aug 11, 2013 1:54 am
- Real name: Andrew Robinson
- Location: Raleigh, North Carolina
- Contact:
Re: Homemade Feedthrough
Why not post the direct link to the specs: http://www.mcmaster.com/#8746k16/=u5i5f7
It should be noted though that McMaster has been known to be "off" in their specs before. You would be better off looking to the manufacture for accurate specs on materials. McMaster is a good general starting place though.
It should be noted though that McMaster has been known to be "off" in their specs before. You would be better off looking to the manufacture for accurate specs on materials. McMaster is a good general starting place though.
I can wire anything directly into anything! I'm the professor!
-
- Posts: 4
- Joined: Sun Dec 07, 2014 10:08 am
- Real name: Jack Foulkes
Re: Homemade Feedthrough
Hi, I am a university student looking to construct a cheap HV feed-through and inner grid. If you don't mind, I have a few questions:
- have you successfully built your fusor with this feed-through system?
- How does the wire actually connect to the inner grid, and why do you need an insulated wire that connects the feed-through to the inner grid, instead of just connecting the contents of the alumina tube to the grid directly?
- How exactly does this part fit onto the chamber?
I am very new to the fusor forum and so some of may questions are probably quite stupid, so just tell me if they are (but I would(obviously) prefer constructive criticism). Thanks alot for any information or advice you can spare.
viewtopic.php?f=6&t=9856
Jack Foukles
- have you successfully built your fusor with this feed-through system?
- How does the wire actually connect to the inner grid, and why do you need an insulated wire that connects the feed-through to the inner grid, instead of just connecting the contents of the alumina tube to the grid directly?
- How exactly does this part fit onto the chamber?
I am very new to the fusor forum and so some of may questions are probably quite stupid, so just tell me if they are (but I would(obviously) prefer constructive criticism). Thanks alot for any information or advice you can spare.
viewtopic.php?f=6&t=9856
Jack Foukles
- Andrew Robinson
- Moderator
- Posts: 688
- Joined: Sun Aug 11, 2013 1:54 am
- Real name: Andrew Robinson
- Location: Raleigh, North Carolina
- Contact:
Re: Homemade Feedthrough
Jack you might want to spend some time in the FAQs. Unless I am misunderstanding one of your questions:
If that's not the case and I'm mistaken, can you either rephrase your question, or can someone else please chime in?
To answer your other question, go search any vacuum component manufacture for Conflat compression fittings. For example: http://www.pchemlabs.com/subcatagoryb.a ... ssion-Port
Also, in Liam's very first post, he references the original designs creator. If you check that link you will find many more examples and descriptions that will answer many of your questions.
As a university student, you should be well accustomed to doing your research beforehand. My old professors would kick me out of their offices if I didn't do my research first.
it seems you have a basic conceptual misunderstanding of what this component is actually for. Please do some more reading first.Jack Foulkes wrote:How does the wire actually connect to the inner grid, and why do you need an insulated wire that connects the feed-through to the inner grid, instead of just connecting the contents of the alumina tube to the grid directly?
If that's not the case and I'm mistaken, can you either rephrase your question, or can someone else please chime in?
To answer your other question, go search any vacuum component manufacture for Conflat compression fittings. For example: http://www.pchemlabs.com/subcatagoryb.a ... ssion-Port
Also, in Liam's very first post, he references the original designs creator. If you check that link you will find many more examples and descriptions that will answer many of your questions.
As a university student, you should be well accustomed to doing your research beforehand. My old professors would kick me out of their offices if I didn't do my research first.
I can wire anything directly into anything! I'm the professor!
- Liam David
- Posts: 518
- Joined: Sat Jan 25, 2014 5:30 pm
- Real name: Liam David
- Location: PPPL
Re: Homemade Feedthrough
It's been a long time since I posted. School has left me with almost no spare time.
The feedthrough has only been tested to 15 or so kV with a NST. I'm working on a new HF x-ray transformer, so that will be the final test for the feedthrough.
The internal conductor is just a (0.1" diameter?) aluminum wire shoved into the alumina tube to make contact with the Swage-lok compression cap. The inner consists of a single piece of tungsten wire with two long "legs" to make sure it doesn't fall out.
Here are some CAD pictures.
And the whole chamber with a work-in-progress diffusion pump.
-Liam David
The feedthrough has only been tested to 15 or so kV with a NST. I'm working on a new HF x-ray transformer, so that will be the final test for the feedthrough.
The internal conductor is just a (0.1" diameter?) aluminum wire shoved into the alumina tube to make contact with the Swage-lok compression cap. The inner consists of a single piece of tungsten wire with two long "legs" to make sure it doesn't fall out.
Here are some CAD pictures.
And the whole chamber with a work-in-progress diffusion pump.
-Liam David
- Adam Szendrey
- Posts: 1333
- Joined: Fri Mar 29, 2002 5:36 pm
- Real name: Adam Szendrey
- Location: Budapest, Hungary
Re: Homemade Feedthrough
Only having a glance at it, I kind of like that feedthrough, it's simple. I actually have a few of these compression fittings (other end being KF25) for my old glass pirani tubes. I could re purpose one...(I accidentally broke both my piranis many years ago...heh..). Thanks for the images!