Search found 320 matches

by Rex Allers
Sun Jul 24, 2016 10:31 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: What does your Budget look like?
Replies: 14
Views: 6315

Re: What does your Budget look like?

Still no-go on that alternate link. I get this: Information You are not authorised to read this forum. Forum admin can't be much fun, especially once a forum gets big, also gets migrated to new software, and has major sections rearranged. Edit: Maybe it wouldn't hurt to create yourself a new alterna...
by Rex Allers
Sun Jul 24, 2016 9:58 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: What does your Budget look like?
Replies: 14
Views: 6315

Re: What does your Budget look like?

Richard, I agree with everything you say about the wide variability of budgets. But I think you missed one of Ptolemy's points about the FAQ thread when he said, "When i click on the link i am prompted a message that tells me i do not have adequate privileges to see the post, let me know if there is...
by Rex Allers
Sat Jul 23, 2016 3:25 pm
Forum: Vacuum Technology (& FAQs)
Topic: Servicing a Varian V200 Turbo Pump
Replies: 16
Views: 6622

Re: Servicing a Varian V200 Turbo Pump

Thanks, Jerry. That's the kind of info I was looking to hear. Pretty much what I expected about how they normally fail, but good to have confirmation. With the crazy RPMs these things spin at there has to be a lot of energy stored in there that has to go somewhere if it crashes, especially on a big ...
by Rex Allers
Fri Jul 22, 2016 9:06 am
Forum: Vacuum Technology (& FAQs)
Topic: Servicing a Varian V200 Turbo Pump
Replies: 16
Views: 6622

Re: Servicing a Varian V200 Turbo Pump

Thanks, Steven. Yeah, that catastrophic failure mode is not a bearing issue. I think I'd notice that pretty fast. Time to shop for a total replacement, I'd think. Hope I never see something like that.
by Rex Allers
Fri Jul 22, 2016 5:29 am
Forum: Vacuum Technology (& FAQs)
Topic: Servicing a Varian V200 Turbo Pump
Replies: 16
Views: 6622

Re: Servicing a Varian V200 Turbo Pump

Interesting stuff on Turbo bearings by both Steven and Jerry. Having no direct experience myself, I'm curious how one knows the bearings need attention? Is the main symptom noise or other stuff? Do turbo bearings tend to fail gradually? Do you guys have any other input about spotting problems and ho...
by Rex Allers
Sat Jul 16, 2016 6:28 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High voltage Fusor grade x-former score (Temporary)
Replies: 32
Views: 14746

Re: High voltage Fusor grade x-former score (Temporary)

As Richard said about using a doubler, "the usable fusor current would have to come from energy storage caps." This is very true. I didn't see any values for capacitance or resistance in the original diagram. It would have been interesting to see what they used. There are design guides for doublers ...
by Rex Allers
Fri Jul 15, 2016 11:23 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High voltage Fusor grade x-former score (Temporary)
Replies: 32
Views: 14746

Re: High voltage Fusor grade x-former score (Temporary)

I did some clean up on your HV supply PDF (the original circuit that you don't actually have). I merged the two pages and did a lot of contrast and clean-up to convert it to a much smaller grayscale image file. HV schem.png Where the two pages join, it looks like a little bit is missing. The wire fr...
by Rex Allers
Mon Jun 27, 2016 4:27 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: "internal helium leak" may suggest Li-6 + Li-6 fusion!
Replies: 8
Views: 5329

Re: "internal helium leak" may suggest Li-6 + Li-6 fusion!

For anyone else who, like myself, didn't know what an RGA was...
Residual Gas Analyzer
a form of mass spectrometer. Got my small understanding from this Wiki page:
https://en.wikipedia.org/wiki/Residual_gas_analyzer
by Rex Allers
Tue Jun 14, 2016 7:20 am
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ - Tools for construction
Replies: 8
Views: 8988

Re: FAQ - Tools for construction

Re: The lathe comments... I bought my first lathe around 2005. I think it's Taiwanese from the early 1990's and seems pretty accurately and well made. I think it's 13" swing over the carriage. The previous owner put a nice 2-axis DRO on it and that's a really nice feature. When I got it I went throu...
by Rex Allers
Thu May 12, 2016 8:12 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - A neutron moderator for activation/detection
Replies: 3
Views: 6614

Re: FAQ - A neutron moderator for activation/detection

I found another source of silver foil that I bought from a couple months ago. www.riogrande.com -- a jewellery materials supplier I bought a piece 2" x 6" x .010" .999 silver. It was about $24 shipped. I then cut it into 3 pieces 2" square. I'm not sure if it is an option for buyers outside of the U...