Search found 7 matches

by Justin Fozzard
Wed May 09, 2018 5:09 pm
Forum: The Trading Post
Topic: For Sale: Two vacuum systems. Collection Only. Essex UK
Replies: 0
Views: 448

For Sale: Two vacuum systems. Collection Only. Essex UK

I have a couple of vacuum systems for sale. Collection Only (Essex UK area.) Both have been stored for several years with all the valves closed so should be in good condition internally and were working before being stored. Sold as seen without any guarantees or returns. Please send a private messag...
by Justin Fozzard
Wed Jan 03, 2018 9:34 pm
Forum: Vacuum Technology (& FAQs)
Topic: Taking a large diffusion pump apart.
Replies: 2
Views: 381

Re: Taking a large diffusion pump apart.

Thanks for your advice, Jerry, you were right. The aluminium top jet was stuck by oily gunk to the lower one and after some very careful tapping with a rubber hammer it simply popped off. The lower jets were held in by a screwed rod and quickly came apart so I can now start cleaning away the old oil...
by Justin Fozzard
Mon Jan 01, 2018 10:13 pm
Forum: Vacuum Technology (& FAQs)
Topic: Taking a large diffusion pump apart.
Replies: 2
Views: 381

Taking a large diffusion pump apart.

Hello and Happy New Year to you all. I wonder if anyone on the forum has dismantled an Edwards E012 diffusion pump? It’s rather large at 12” diameter and so far I have been a bit stumped as to how to take it apart for cleaning. The pump is for use with a large vacuum chamber that I hope to use for s...
by Justin Fozzard
Wed Sep 27, 2017 9:03 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Bonding Tungsten and/or Iridium?
Replies: 27
Views: 3317

Re: Bonding Tungsten and/or Iridium?

Here are some photos of the innards of a Hughes 250 Watt-Seconds impulse welder that I use for electrode welding. The capacitors are charged to a maximum of about 450V and are discharged into the output transformer using surprisingly small thyristors. Front Panel: Hughes Welder 1.jpg The supply and ...
by Justin Fozzard
Sun Aug 27, 2017 9:11 pm
Forum: Images du Jour
Topic: Homemade Diffusion Pump
Replies: 2
Views: 610

Re: Homemade Diffusion Pump

Hello Ian, The top jet is screwed onto a steel shaft that is in turn screwed into the centre of the brass base casting. The second jet is sits on a step turned on the outside of the inner copper jet tube. The jet tubes are silver soldered into annular grooves turned in the base casting. The lower ri...
by Justin Fozzard
Fri Aug 25, 2017 8:37 pm
Forum: Images du Jour
Topic: Homemade Diffusion Pump
Replies: 2
Views: 610

Homemade Diffusion Pump

Here is a photo of my attempt at building a diffusion pump as a 14-year old schoolboy. Homemade Diffusion Pump.jpg It was my own design based on a picture in an encyclopedia article. I never got round to testing the pump and don't know if it would have worked. I was given an old vacuum sputter coate...
by Justin Fozzard
Thu Aug 24, 2017 11:18 am
Forum: Please Introduce Yourself
Topic: Greetings from a shed in Essex, England
Replies: 1
Views: 284

Greetings from a shed in Essex, England

Hello, I’m Justin Fozzard, an electronics engineer from Essex, England. I’ve been fascinated by plasma physics since my early teens when I spotted a faulty neon sign in a shop window. A very thin glowing filament was writhing about inside a letter O and I wondered what was causing it. As luck would ...