Search found 95 matches

by UG!
Mon Jan 23, 2006 10:56 pm
Forum: Vacuum Technology (& FAQs)
Topic: three different vacuum pumps...
Replies: 8
Views: 3259

Re: three different vacuum pumps...

<t>sometimes one can improvise repairs. i have a single stage belt drive edwards i rebuilt. the gasget was destroyed on dissassembeling and i replaced it with some sticky backed foamy stuff. a rubber flap on a vlave had perished and fallen off, so i replaced it with a few lairs of neoprene pond line...
by UG!
Fri Jan 13, 2006 1:45 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Equipment
Replies: 8
Views: 2609

Re: Vacuum Equipment

<t>i would say, if you have the stuff and can throw something together with what you have without putting too much effort in then do it. bras isn't a great vacuum material as the zinc evaporates, but you don't need a great vacuum to make a nice glow. the problem is, at some point you will want to at...
by UG!
Thu Jan 12, 2006 1:17 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: how does one solder glass with indium?
Replies: 7
Views: 4031

Re: how does one solder glass with indium?

<t>Thanks thats very helpful!<br/> <br/> do i have to worry about differential expansion when soldering glass/ceramic to metal, or are the temperatures low enough for it not to matter? should i design to do end to end joints or can i (for example) solder a glass piece into a close fitting recess (to...
by UG!
Wed Jan 11, 2006 11:37 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: how does one solder glass with indium?
Replies: 7
Views: 4031

how does one solder glass with indium?

<t>I have attempted to solder glass and ceramics with both pure indium and a approximately 50:46:4 mix of indium tin and silver. the best results i have got is a kind of stuck blob, that is easily removed with moderate pressure. so how do i actually do this? do i need some kind of flux to clean the ...
by UG!
Sat Jan 07, 2006 3:07 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: high alumina casting cement/ceramic
Replies: 8
Views: 4016

Re: high alumina casting cement/ceramic

<r>indead, Roberto has a point. i wasn't so much interested in just makeing a feedthrou, as in the possability of custom ceramic parts for ion guns, e guns, supports etc. alough i had an idea to make a small custom feedthrough and imerse the outside conection in oil, with a metal tube covering it, s...
by UG!
Sat Jan 07, 2006 3:05 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - NIM - SPECS - HISTORY ongoing and updated
Replies: 15
Views: 13942

Re: FAQ - NIM - SPECS - HISTORY ongoing and updated

<t>ok, here are some by different makes:<br/> J&P:<br/> 256 channel buffer register NM471<br/> tape punch controller NM199A<br/> 256 channel store NM710<br/> print sequence controller (no number)<br/> display controller NM721<br/> <br/> LRS:<br/> gated latch model170 (so old it used light bulbs ...
by UG!
Fri Jan 06, 2006 11:11 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - NIM - SPECS - HISTORY ongoing and updated
Replies: 15
Views: 13942

Re: FAQ - NIM - SPECS - HISTORY ongoing and updated

<t>I liberated some rather old NIM modules from the physics dept at uny which seemed to be early digital stuff, printer interfaces, latches, an aincent video distrobution amp, and loads of custom stuff obviously home-made by the bods in the physics dept some 40 years ago by the look of them. the pro...
by UG!
Fri Jan 06, 2006 3:48 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: high alumina casting cement/ceramic
Replies: 8
Views: 4016

high alumina casting cement/ceramic

<t>Just so everyone knows, and to save them from making the same mistake i have, the commonly available 'just add water' casting product containing alumina and calcium oxide (there are many brands, secar 71 being what i got) is NOT suitable for either vacuum or high voltage applications. the reason ...
by UG!
Thu Dec 08, 2005 10:30 am
Forum: Vacuum Technology (& FAQs)
Topic: gold plating vacuum components
Replies: 8
Views: 2764

Re: gold plating vacuum components

apparently the origanal patent sugested a mix of sulphuric, phosphoric and IPA. citric acid would certanly be easyer!
unfortunitly i don't have the option of getting it done profesionly as i have absolutly no money until somone gives me a job.

Oliver
by UG!
Tue Dec 06, 2005 11:11 pm
Forum: Vacuum Technology (& FAQs)
Topic: gold plating vacuum components
Replies: 8
Views: 2764

Re: gold plating vacuum components

indead electropolishing is a good idea, i shall try it, if i can locate the right chemicals for the electrolyte.

Oliver