Search found 435 matches

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: 119

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: 251

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: 231

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: 21
Views: 1344

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: 402

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: 752

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: 734

Re: HV rated feedthroughs

Is my impression that Paschen's Law keeps that from happening for a while compared to the air side correct?
by ian_krase
Thu Jun 14, 2018 3:17 am
Forum: The Trading Post
Topic: [FREE] Nonfunctional MKS 919 Guts
Replies: 0
Views: 537

[FREE] Nonfunctional MKS 919 Guts

I have the guts of an MKS 919 hot cathode ionization gauge controller for free to anybody who takes it off my hands. These guts are supposedly nonfunctional, and definitely contain at least one bodge wire, but they also have a variety of interesting and not-so-interesting parts. Notably, two large a...
by ian_krase
Mon Jun 11, 2018 7:11 pm
Forum: New User Chat Area
Topic: HV rated feedthroughs
Replies: 5
Views: 734

Re: HV rated feedthroughs

Totally untrue.

What is true is that many feedthroughs can be upgraded by adding more insulation / oil immersion on the atmosphere side. So you might easily make a 20 kV feedthrough good for 50 or more kV.
by ian_krase
Mon Jun 11, 2018 7:10 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Does this look sufficient for a proof of concept fusor?
Replies: 7
Views: 1856

Re: Does this look sufficient for a proof of concept fusor?

That Bell jar looks pretty thin edged. Doesn't that style of Bell jar normally have a think heel if meant for vacuum?