Search found 828 matches

by Jerry Biehler
Thu Oct 18, 2018 7:39 am
Forum: Vacuum Technology (& FAQs)
Topic: Updated Diffusion Pump Assembly and Thermal Modeling
Replies: 3
Views: 185

Re: Updated Diffusion Pump Assembly and Thermal Modeling

Plates are way thicker than they need to be. You're only talking 15psi here.

I get cast aluminum tooling plate here: http://www.sandsmachine.com/alumweb.htm
Good prices and I have used them for all sorts of vacuum projects.
by Jerry Biehler
Sat Oct 13, 2018 6:02 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Titanium walls
Replies: 4
Views: 493

Re: Titanium walls

Just look at a titanium sorption pump. Basically filaments with Ti on them and the Ti evaporates on the walls and the active gasses bind with the fresh Ti and are removed from the atmosphere. So just buy some replacement filaments for these.
by Jerry Biehler
Mon Oct 01, 2018 2:37 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Operating three phase high voltage power supply on single phase power
Replies: 10
Views: 964

Re: Operating three phase high voltage power supply on single phase power

As long as you the unit does not have phase loss detection or an input where it uses multiple internal power supplies off the different phases to run the logic you should be ok with running it at reduced capacity on single phase with a bucking transformer. Probably 1/3rd capacity would be a good rul...
by Jerry Biehler
Sat Sep 01, 2018 6:16 am
Forum: New User Chat Area
Topic: What flange is this?
Replies: 5
Views: 665

Re: What flange is this?

Looks like a special. Should be easy to make an adapter for.
by Jerry Biehler
Fri Aug 24, 2018 5:49 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1197

Re: convectron 275 tube and controller

I might be able to get pinouts, but do you have a source for the tube end of the connector? It is proprietary.

Convectrons are good, I am putting them on my big system, just got to make sure they are orientated so that the tube lays horizontal.
by Jerry Biehler
Wed Aug 22, 2018 3:55 am
Forum: Vacuum Technology (& FAQs)
Topic: Debugging an Inficon PKR 251 Series Gauge
Replies: 3
Views: 473

Re: Debugging an Inficon PKR 251 Series Gauge

Send it back and get your money back, I usually dont spend more than $100 on these units.
by Jerry Biehler
Sat Aug 18, 2018 2:43 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: DIY hermetic feedthroughs: Has anybody done this?
Replies: 5
Views: 835

Re: DIY hermetic feedthroughs: Has anybody done this?

I actually worked at bullseye glass for about 2.5 weeks before I was canned for "not being excited about glass". Sigh. Anyway... Most art glass is soda lime. We had special machines build specifically for the job but you could do a ball mill with a bunch of alumina balls which you can get off ebay. ...
by Jerry Biehler
Thu Aug 16, 2018 3:14 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: DIY hermetic feedthroughs: Has anybody done this?
Replies: 5
Views: 835

Re: DIY hermetic feedthroughs: Has anybody done this?

Well not every hydrogen thyratron. I have seen small ones that have dumet seals and big ones that are metal ceramic. Its pretty easy to do a U glass seal to tungsten. Get some borosilicate U glass, it is still available now and then. Heat up the tungsten you will be using as the electrode in a flame...
by Jerry Biehler
Fri Jul 20, 2018 7:13 am
Forum: Images du Jour
Topic: Killer deal on a GeLi gamma spec
Replies: 6
Views: 839

Re: Killer deal on a GeLi gamma spec

FWIW, Hf is used in plasma cutter tips, its that little silver piece in the center of the electrode, it melts and helps stabilize the arc.
by Jerry Biehler
Fri Jul 20, 2018 7:10 am
Forum: New User Chat Area
Topic: HV feedthrough purchase problems
Replies: 4
Views: 676

Re: HV feedthrough purchase problems

Call them. Do not rely on email.