Search found 119 matches

by Larry Upjohn
Fri May 29, 2009 11:53 pm
Forum: Images du Jour
Topic: Archived - Kitchenaid fusor first light
Replies: 13
Views: 7840

Re: Kitchenaid fusor first light

Wyatt;
how did you bore the hole for the view port in the SS Bowl and what are you using for the view port. Great work for low budget. Larry Upjohn.
by Larry Upjohn
Wed May 27, 2009 6:30 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Cosmic-ray Neutron Monitor
Replies: 16
Views: 7883

Re: Cosmic-ray Neutron Monitor

<t>Jon;<br/> what software do you use for your data charts. I have used several varieties over the years but find that with the prevalence of the "Dot Net" variants now days that my old libraries don't work well anymore. Thanks for your input and great work that continues to inspire my fitfull progr...
by Larry Upjohn
Fri Mar 20, 2009 11:30 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: History - Of dekatrons, and ships and kings and sealing wax.
Replies: 7
Views: 3946

Re: History - Of dekatrons, and ships and kings and sealing wax.

<t>Richard;<br/> My highschool physic teacher was a physics professor at the U.S. Naval Postgraduate School in Monterey, CA. We got to do many of our labs in the school teaching labs. Our teacher gave us a tour of the schools light water reactor for training nuclear power engineering officers. He de...
by Larry Upjohn
Mon Nov 10, 2008 9:52 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Demo Fusor close to first light
Replies: 24
Views: 8487

Re: Demo Fusor close to first light

Thanks Richard. There is much more to do, starting with a cleanup of my limited work space, improvement of my project realization and etc. I am still working two jobs so time is much at a premium as well. I am threatening to retire to just one job here soon. More later, Larry Upjohn.
by Larry Upjohn
Mon Nov 10, 2008 9:49 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Demo Fusor close to first light
Replies: 24
Views: 8487

Re: Demo Fusor close to first light

Steve;
I have already budgeted a Baratron style capacitance manometer for my "real" harder vacuum guaging. This TC sending unit has been rehabed after oil contamination so it a qualitative guage right now till the Baratron is on board. More later, Larry Upjohn.
by Larry Upjohn
Mon Nov 10, 2008 6:10 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Demo Fusor close to first light
Replies: 24
Views: 8487

Re: Demo Fusor close to first light

Tonight after a flight home from Seattle I have applied voltage for the first time. Vacuum is noted on the photos below. The lowest is just chamber pump down with no power to the grid. The second guage photo represents pressure increase with grid power. First two grid photos are the early scintillat...
by Larry Upjohn
Mon Oct 20, 2008 5:04 pm
Forum: Vacuum Technology (& FAQs)
Topic: DuoSeal 1400 pump rehab.
Replies: 10
Views: 5454

Re: DuoSeal 1400 pump rehab.

<t>Richard;<br/> cleaned the reed valve and indeed it was free of any pits or indications of fatigue. The bluing was slightly worn where the valve seals against the first pump stage but that would be expected after at least 25 years of use. As noted in my response to your recent FAQ on pumps with ph...
by Larry Upjohn
Fri Oct 17, 2008 4:39 am
Forum: FAQs: Vacuum Technology
Topic: FAQ: Mechanical Pumps - Types needed - new and used
Replies: 5
Views: 12006

Re: FAQ: Mechanical Pumps - new and used

<t>Richard;<br/> Your FAQ is most timely! I have just completed a seal changeout on my 1400 with the result that my readout was just about the same before cleanout and new seals. However there is no puddle of oil on the floor. Your above instructions on the cleaning and maintenance of TC senders ins...
by Larry Upjohn
Tue Oct 14, 2008 5:15 pm
Forum: Vacuum Technology (& FAQs)
Topic: DuoSeal 1400 pump rehab.
Replies: 10
Views: 5454

Re: DuoSeal 1400 pump rehab.

<t>Completed installation of seal kit this last weekend. Did a 3 hour pumpdown to get everything thoroughly warm and still was only able to hit about 80 microns. It doesn't leak a drop now. I only diassembled the oil tank side of the pump cleaning with mineral spirits then thorough drying. Lots of r...
by Larry Upjohn
Fri Oct 03, 2008 11:06 pm
Forum: Vacuum Technology (& FAQs)
Topic: DuoSeal 1400 pump rehab.
Replies: 10
Views: 5454

Re: DuoSeal 1400 pump rehab.

<t>Dave;<br/> was able to remove large pulley easily with gear puller with no damage to shaft. Motor shaft pulley was gummy but came off as well. Seal Kit from Duniway actually comes from Precision Plus and is first quality. Has a red anodized centering jig to assure seal is concentric with pulley s...