Search found 414 matches

by ian_krase
Fri Apr 20, 2018 6:13 am
Forum: Vacuum Technology (& FAQs)
Topic: Voltage/Pressure Tuning Advice
Replies: 9
Views: 430

Re: Voltage/Pressure Tuning Advice

To expand on the whole ballast and current control thing a bit: When gas discharges (arc or glow discharge) are struck, they go from being high impedance to very low impedance really, really quickly. This sort of thing isn't too much of a problem for your common everyday 0-60V 0-5A constant voltage/...
by ian_krase
Wed Apr 18, 2018 8:18 am
Forum: Vacuum Technology (& FAQs)
Topic: Voltage/Pressure Tuning Advice
Replies: 9
Views: 430

Re: Voltage/Pressure Tuning Advice

Have you got a ballast?
by ian_krase
Tue Apr 17, 2018 6:34 am
Forum: Vacuum Technology (& FAQs)
Topic: Can I make my own ConFlat flanges?
Replies: 27
Views: 712

Re: Can I make my own ConFlat flanges?

It's not needed to have conflat flanges for fusion. If you can do CNC machinist, an O ring groove is more than good enough.
by ian_krase
Mon Apr 16, 2018 8:07 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Can this be used? (Noob question)
Replies: 3
Views: 333

Re: Can this be used? (Noob question)

Didn't anybody teach you manners? Follow the rules.

Also this question is sorta addressed in the FAQ.
by ian_krase
Sun Apr 15, 2018 3:20 pm
Forum: The Trading Post
Topic: Old-Fashioned Vacuum Tube Factory closing down -- may be interesting?
Replies: 1
Views: 281

Old-Fashioned Vacuum Tube Factory closing down -- may be interesting?

There's a sort of vacuum tube factory closing down in Oceanside, CA (south of LA) and trying to sell off some of their equipment. I'm not sure what is really valuable to people who aren't into tubes, but they appear to be getting rid of some reasonably sized diffusion pumps which is sure to interest...
by ian_krase
Thu Apr 05, 2018 4:49 pm
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 14
Views: 866

Re: TMH-260 Turbo

Bearings likely available from Alpine Bearing. Expect to pay hundreds of dollars.

You'll need to balance the rotor. There are some cheapish tricks you can use for this.
by ian_krase
Wed Apr 04, 2018 2:32 am
Forum: Please Introduce Yourself
Topic: Hello from Canada
Replies: 1
Views: 135

Re: Hello from Canada

Welcome to the board!

You should understand that nobody here makes enough power to extract it, or uses a real plasma containment other than the intertial confinement of the fusor. Still, this is a good way to learn about the craft.
by ian_krase
Mon Apr 02, 2018 6:07 am
Forum: Vacuum Technology (& FAQs)
Topic: Critique this turbomolecular pump backed by Welch 1400 setup
Replies: 17
Views: 734

Re: Critique this turbomolecular pump backed by Welch 1400 setup

I should probably clarify. I don't disagree that CAD is a useful tool for complex vacuum systems or ones where you machine your own parts -- or even hack together enough of your own parts in restricted envelopes or the like. However, for somebody who is mostly at the raw basic level of prototyping m...
by ian_krase
Mon Apr 02, 2018 4:34 am
Forum: Images du Jour
Topic: Sharing hamfest booty images
Replies: 12
Views: 1187

Re: Sharing hamfest booty images

I'm surprised to see all this high quality newish test equipment for sale at cheap prices. Not a thing I've encountered yet at the electronics flea market.
by ian_krase
Sun Apr 01, 2018 11:05 pm
Forum: Vacuum Technology (& FAQs)
Topic: Critique this turbomolecular pump backed by Welch 1400 setup
Replies: 17
Views: 734

Re: Critique this turbomolecular pump backed by Welch 1400 setup

Personally I don't recommend CAD for amateur vacuum systems unless you are either rich or are building complex custom parts yourself. It doesn't go all that well with the parts scrounging strategy IMO. While Teflon tape can work for vacuum a better option maybe the use of Loctite 290 to glue the thr...