Search found 45 matches

by Ed Meserve
Sun Jan 19, 2020 4:00 am
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 3693

Re: Is It A Farnsworth... or a Hirsch (redux)

More Pictures of the Cathode:
by Ed Meserve
Sun Jan 19, 2020 3:55 am
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 3693

Re: Is It A Farnsworth... or a Hirsch (redux)

Hello Folks, It's been a while since I've last posted anything, but I lurk the forum semi-regularly. I just happened to be in Idaho this week on business, and had a day to kill before flying out, so I took a trip up to Rigby and stopped into the Farnsworth Museum. The gentleman volunteering at the d...
by Ed Meserve
Sun Mar 09, 2014 9:07 pm
Forum: Vacuum Technology (& FAQs)
Topic: USM Fusion Group, Mark II Vacuum Progress Update
Replies: 1
Views: 1408

USM Fusion Group, Mark II Vacuum Progress Update

It's been a while since I have posted an update, mostly because we've only been able to work on the rig sporadically. We've made some progress in chasing down vacuum leaks and wanted to share some images. We had been getting progressively better vacuum, (granted, small degrees) but we couldn't pull ...
by Ed Meserve
Thu Nov 07, 2013 6:13 pm
Forum: Vacuum Technology (& FAQs)
Topic: Average Time for Epoxy to Out-gas?
Replies: 3
Views: 2771

Re: Average Time for Epoxy to Out-gas?

Nick,
Thanks for the NASA link. Checked out Uline, the manufacturer of the epoxy I used; it wasn't listed.

Jeroen,
Thanks for the curing tip. I will try curing it at 100 deg. and compare the results.

Ed
by Ed Meserve
Wed Nov 06, 2013 9:44 pm
Forum: Vacuum Technology (& FAQs)
Topic: Average Time for Epoxy to Out-gas?
Replies: 3
Views: 2771

Average Time for Epoxy to Out-gas?

Hello All, I have a quick question: How long does it take average two-part epoxy to stop (or lessen) most of its out gassing? Below is a photo of how we have setup our grid. I've insulated the stalk of the grid with the epoxy two-thirds of the way up to get past the collar in the chamber, which is c...
by Ed Meserve
Wed Nov 06, 2013 9:17 pm
Forum: Images du Jour
Topic: Archived - USM Fusion Group, Mark II First Light
Replies: 0
Views: 1157

Archived - USM Fusion Group, Mark II First Light

We have first light on our new rig, the Mark II, though we are still struggling with the vacuum. It's all by eye so far, haven't setup the metering on it yet.
MarkII-First Light-2013-11-06.jpg
MarkII-First Light-2013-11-06.jpg (5.88 KiB) Viewed 1144 times
Also uploaded a video of the plasma's behavior.
https://www.youtube.com/watch?v=1iexYCUxYx8

Ed
by Ed Meserve
Thu Aug 08, 2013 5:55 pm
Forum: Vacuum Technology (& FAQs)
Topic: Welch 1400 Repair
Replies: 2
Views: 1242

Re: Welch 1400 Repair

Thanks, Brian! I completely forgot where I had read that.

Ed
by Ed Meserve
Wed Aug 07, 2013 7:55 pm
Forum: Vacuum Technology (& FAQs)
Topic: Welch 1400 Repair
Replies: 2
Views: 1242

Welch 1400 Repair

Back in March we managed to crack one of the plates on our Welch 1400 (don't ask me how) and we've been working to machine a replacement in aluminum. IMAG0611.jpg Took a while, but we recently finished the replacement. IMAG0651.jpg I've reassembled the pump and filled it with oil and it holds the oi...
by Ed Meserve
Fri Jun 28, 2013 1:29 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Metallic - Non Metallic Grid?
Replies: 18
Views: 5522

Re: Metallic - Non Metallic Grid?

Would .5mm Tungsten/Rhenium be strong enough for an inner grid? It is being sold by the foot on Ebay:

http://www.ebay.com/itm/ONE-FOOT-0-020- ... vi-content
tungsten-rheniumwire.jpg
by Ed Meserve
Mon Jun 03, 2013 11:25 pm
Forum: Vacuum Technology (& FAQs)
Topic: Broken Welch 1400 Plate
Replies: 0
Views: 775

Broken Welch 1400 Plate

Well, we did it good. We managed to break the plate on our Welch 1400. IMAG0611.jpg So, To replace it, we are going to try a piece of machined aluminium. The tricky part will be to put it back together properly. I found a suggestion to use rolling papers to adjust the clearances on the rotor, here: ...