Search found 90 matches

by John Taylor
Tue Jul 05, 2011 4:13 pm
Forum: Vacuum Technology (& FAQs)
Topic: Diffusion Pumps 101
Replies: 25
Views: 11197

Re: Diffusion Pumps 101

Very nice workmanship! I can't wait to hear how well it works, I would like to emulate this as it looks like a great project.
by John Taylor
Tue Jun 28, 2011 4:49 pm
Forum: Vacuum Technology (& FAQs)
Topic: Cooke cold cathode thermocouple gauge
Replies: 6
Views: 1858

Re: Cooke cold cathode thermocouple gauge

Thanks so much for all the advice. I have plenty of room on the PC board to mount a capacitor that is much larger. I am going to replace both of the caps, and since this part of the gauge only has passive components, it should be fixed. Now, on to finishing my hi-voltage PS for the chamber...
by John Taylor
Sat Jun 25, 2011 2:38 am
Forum: Vacuum Technology (& FAQs)
Topic: Cooke cold cathode thermocouple gauge
Replies: 6
Views: 1858

Re: Cooke cold cathode thermocouple gauge

The CC side has a 4000 volt capacitor that is breaking down, but the TC side is working fine. Thanks!
by John Taylor
Sat Jun 25, 2011 2:37 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Lucky find at scrap yard
Replies: 4
Views: 2503

Re: Lucky find at scrap yard

<t>It is a potential transformer and I had thought about stringing a bunch of 1N4007 rectifiers to get the needed PIV. I hadn't even thought about the idea of using higher frequency. I may actually try this, but for now, I'll use a variac, but will have to figure out some kind of current limiting. T...
by John Taylor
Fri Jun 24, 2011 4:52 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Lucky find at scrap yard
Replies: 4
Views: 2503

Lucky find at scrap yard

<t>While searching through scrap metal for a suitable chamber, I came across an amazing high voltage transformer. I was hoping to find some stainless material for chamber construction and, since I am still in the beginning phase, I need basically everything to get a working fusor. After discussing t...
by John Taylor
Thu Jun 23, 2011 10:43 pm
Forum: Vacuum Technology (& FAQs)
Topic: Cooke cold cathode thermocouple gauge
Replies: 6
Views: 1858

Re: Cooke cold cathode thermocouple gauge

<t>Cold Cathode Thermocouple is apparently just the name on the front. After taking the unit apart and tracing circuitry, it has two thermocouple type gauge inputs for atmosphere down to around 1 micron and then a cold cathode Penning type gauge for 10^7 torr. The two TC come into one part of the in...
by John Taylor
Thu Jun 23, 2011 4:20 pm
Forum: Vacuum Technology (& FAQs)
Topic: Cooke cold cathode thermocouple gauge
Replies: 6
Views: 1858

Cooke cold cathode thermocouple gauge

<t>I recently purchased a Cooke model CC64/42 cold cathode thermocouple gauge cheaply on Ebay and wondered if anyone is familiar with it. It seems to be functional, but I would like to find some literature on it. I have already emailed Cooke Vacuum Products and they are trying to find if they still ...
by John Taylor
Thu Jun 23, 2011 4:06 pm
Forum: Vacuum Technology (& FAQs)
Topic: Diffusion Pumps 101
Replies: 25
Views: 11197

Re: Diffusion Pumps 101

George, I have a new 4" muffin fan with connector and matching guard I'll give you if you promise to keep us informed of the details. I, for one, would rather build my own equipment than buy it if at all possible. This seems like it would be a rather fun project.
by John Taylor
Wed Jun 22, 2011 7:33 pm
Forum: Vacuum Technology (& FAQs)
Topic: Chamber construction...what about nickel plating?
Replies: 7
Views: 3241

Re: Chamber construction...what about nickel plating?

Thanks for the very quick reply! I love building projects and will keep this forum up to date on my progress, as I will use whatever I can find at as low a price as possible.
by John Taylor
Wed Jun 22, 2011 7:19 pm
Forum: Vacuum Technology (& FAQs)
Topic: Chamber construction...what about nickel plating?
Replies: 7
Views: 3241

Chamber construction...what about nickel plating?

<t>I am new to all this and trying to build a first fusor. One of my hurdles is obviously a vacuum chamber. I have access to a large valve body made from mild steel. This would give me three large flanged connections into an approximately 12 inch spherical cavity where the innards of the valve used ...