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Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
nice job fabio! what's the neutron output of the fusor?
Actually this is only a demo fusor that runs with air (so no fusion can be made)
i have found some heavy water, but i still need a better vacuum; my pump can reach 30 microns (measured) but i actually have some leaks in the chamber and the maximum grade of vacuum obtained so far was only 215 microns now i'm working to a better chamber entirely made in stainless steel but i haven't a lathe so i must ask to friends and wait long times for every piece!
also, is boro glass required for vacuum tubes? the only torch I can use (without a 2 hour drive and limited work ability) lasts 15 minutes before the oxygen runs out, and I still can't afford a bigger setup, so I hope to use soft glass...
borosilicate glass can be easily worked with less cracking problems but glass to metal seals are difficult to make so if you want blow vacuum tubes and glow discharge devices i suggest the use of soda glass and a really special (but also economic and easy to obtain) kind of glass to metal seals: some diode have a glass body (eg 1N4148 or some 1W zeners if bigger terminals are needed) just wipe terminals with a sandpaper to remove tin/lead solder and you have a perfect terminal for glass working
anyhow, if you already have a gas-oxygen torch you don't need a bigger setup but only a bigger oxygen cilinder!i don't know prices in US, but in italy really small single use cilinders are quite expensive and of course runs out in a short time; after i runs' out 2 bottles, i asked to a local gas supplier and i bought a 14 liters x 200 bar (2800 liters capacity) oxygen cylinder for only 150 euros (charged and ready for use), every future refill will' cost only 30 euros
............... anyhow, this is "Post Your Cool Pic Here!" NOT a glassblowing theread so i imediately add some other pics
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Nice dog Reaching and awesome spotwelder there Fabio.
Also Fabio, what's that small terminal block on the rear right corner of your spotwelder do? Also isn't the top electrode grounded by the looks of it? Or is there a tiny insulator that I can't see?
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
the small white terminal block is the connection to a remote switch; almost all spotwelder are fired by a foot switch because both hands are occupied during welding.
top electrode is connected to metallic chassis (and also grounded for safety, see yellow-green cable behind), the bottom electrode is connected to "hot" leg of the transformer but never pose any healt risk because the transformer have only 3,2V output (at more than 1kA peak current!) Of course, the transformer is homemade (old MOT with shorted secondary, rewired with 4 turns of monster audio cable)
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
AWESOME 833C vttc stuff: Right lower side green and brown thing with blue things is the grid leak resistors and capacitors. The white thing covered half way by red is a tank resistor and inductor. The red round thing is a 45kv 2nf capacitor.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
the torch I have will not work with standard oxygen tanks (it uses the disposable bernzomatic tanks), so I would have to buy a new head, hoses, and regulators... a local glass blower (who supplies me with lots o free glass since he and some friends buy them by 25 sq. ft pallets) said he might give me his old one if he does not need one at his school... so far I still have to save up for it (I have way too many things before it though on my priority list, and 15 min is good enough for small things for art... but not enough for bulb making, as the flame is too thin and cannot heat very evenly, and if made bigger the tanks empty in less time...
also, with other fusors I have seen, it was not a faulty seal, but rather the seal choice... what are you using? Are you using any getter material?
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Arcstarter wrote ...
AWESOME 833C vttc stuff: Right lower side green and brown thing with blue things is the grid leak resistors and capacitors. The white thing covered half way by red is a tank resistor and inductor. The red round thing is a 45kv 2nf capacitor.
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
I know that threaded joints aren't vaccum tight so i use epoxy glue to sealing purposes (of course, with this method all joints are definitive, but who cares!), all taps are steel ball type, the O-ring for sealing the bell jar is made with natural rubber, i don't' use any getter material inside.
Back to topic.... some other cool pics added .......TURBINE ENGINE........ under construction..........
Some Xray tube, radiation measurement equipment and radioactive items from my collection (all of these images are outdated because i buy, sell and exchange items regulary)
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Post Your Cool Pic Here!
