Search found 435 matches

by ian_krase
Sat Jul 21, 2018 11:50 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: In-Vacuum Electrical Connectors
Replies: 2
Views: 119

Re: In-Vacuum Electrical Connectors

It seems like this is almost always going to be screws and nuts for the low-budget. Accu-Glass has many options including circular "C-sub" connectors for multi-pin instrumentation and larger pin-and-sleeve connectors. However they are dear. If you are OK with brass in your chamber, you have many opt...
by ian_krase
Sat Jul 21, 2018 11:45 pm
Forum: Announcements and Site Administration Topics
Topic: How did you find our Fusor forum?
Replies: 6
Views: 188

Re: How did you find our Fusor forum?

Is it possible we could transfer, say, everything older than 2016 to a static site and then reboot the forum? If I'm not mistaken, static sites are cheap. Is there a way to limit search-engine indexings to once every few weeks or something? A little transparency about what the costs are plus a reque...
by ian_krase
Fri Jul 20, 2018 4:52 am
Forum: Announcements and Site Administration Topics
Topic: How did you find our Fusor forum?
Replies: 6
Views: 188

Re: How did you find our Fusor forum?

I'm pretty sure I found it by google, and by googling specific non-fusion-related info about vacuum tech.
by ian_krase
Mon Jul 16, 2018 12:29 am
Forum: Announcements and Site Administration Topics
Topic: Sunnyvale Mini Meetup -- August 11
Replies: 1
Views: 163

Sunnyvale Mini Meetup -- August 11

Since my attempt yesterday got good response but only one person actually came: I propose that those of us who live in the south San Fransisco Bay Area have a mini-meetup in Sunnyvale after the Sunnyvale Electronics Flea Market on August 11. As the flea market winds down we would meet up at a nearby...
by ian_krase
Sun Jul 15, 2018 12:16 am
Forum: New User Chat Area
Topic: VACUUM CHAMBER
Replies: 5
Views: 303

Re: VACUUM CHAMBER

Glass is risky in vacuum because its brittle, but in general vacuum forces are not overwhelming to a chamber that is either properly stiffened or just thick-walled. 1/8th inch is thicker than needed for the typical vacuum hemisphere chamber, 1/16th inch (1.5 mm) is enough. However, Plexiglass will l...
by ian_krase
Mon Jul 09, 2018 5:48 am
Forum: Announcements and Site Administration Topics
Topic: HEAS 2018 invitation sign up time
Replies: 2
Views: 256

Re: HEAS 2018 invitation sign up time

Is it *only* the 6th? Can you post any notes on transportation and lodging?
by ian_krase
Tue Jun 26, 2018 8:25 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 24
Views: 1560

Re: Couple of questions

Personally, I STRONGLY recommend that you put plenty of work into excellent grounding. Get some thick-ish copper wire and connect all the things in a star network. Even if you don't have an actual faraday cage, making sure that you'll inadvertantly touch or get neara grounded conductor rather than a...
by ian_krase
Mon Jun 25, 2018 7:33 am
Forum: New User Chat Area
Topic: Anyone recognize what type of flange this is?
Replies: 5
Views: 416

Re: Anyone recognize what type of flange this is?

Yeah, that definitely looks like a sanitary ("milk pipe") flange to me.

I have seen them used in vacuum work in rare situations, mostly in things like the separation to open up foreline traps for replacing the media.
by ian_krase
Thu Jun 14, 2018 3:50 am
Forum: New User Chat Area
Topic: Diffusion pump power wire convert
Replies: 7
Views: 812

Re: Diffusion pump power wire convert

To slightly elaborate on "makes life easier for switches":

Since AC is going around zero volts and zero amps 50-60 times a second, it's much easier to stop an arc.
by ian_krase
Thu Jun 14, 2018 3:47 am
Forum: New User Chat Area
Topic: HV rated feedthroughs
Replies: 5
Views: 781

Re: HV rated feedthroughs

Is my impression that Paschen's Law keeps that from happening for a while compared to the air side correct?