[Requist] Looking for vacuum equipment (NL)

Use this forum to offer / scavenge for fusor parts
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Joep Stuyfzand
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[Requist] Looking for vacuum equipment (NL)

Post by Joep Stuyfzand » Wed Oct 03, 2018 11:53 am

Hi all,

I am well on my way building a fusor, however, I am having some trouble sourcing vacuum equipment.
A lot of the offers on eBay for Oil Diffusion pump and other items have enormous shipping fees to the Netherlands. For example often over 150% of the price of the pump.
I am keeping a close eye on auction sites but my hopes are getting lower, so I figured I would make a post here to improve my chances.

I am looking for: (Netherlands/Belgium/Germany area)

An Oil Diffusion pump. Any working model will do. My chamber is not at all big and I do not strive for the highest neutron count (yet) so
it does not have to be a high end model either.

A vacuum gauge. Something along the lines of a MKS 901P, these are very reasonably priced on eBay but I figured it would be better for all parties involved if I took an extra one of someones hands.

Deuterium. Any amount is welcome. I do not plan on using significant amounts. I'd rather help someone get rid of some than buy a whole bottle on
sigma.

Valves/tubing which are suitable for Deuterium.

All prices are up for negotiation.

Thanks in advance.

Roberto Ferrari
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Re: [Requist] Looking for vacuum equipment (NL)

Post by Roberto Ferrari » Wed Oct 03, 2018 2:18 pm

Hi Joep

As I stated several times, it is easy to recover a damaged diffusion pump.
Try to find some high vacuum seller or mass spectrometer seller and talk with their support people.
Some companies discard a damaged diffusion pump, mostly due to two possible problems: cracked glass oil level visor or burned off heater.
I have three, recovered from mass spectrometers due to crack in the glass window. I just pulled off the rests of the window and sealed the hole with a SS blank, using TIG. Most of them are air cooled.
In case you are in touch with university labs, try to reach people using analytical instrumentation.
In the past, here in Argentina, when CRT factories stopped manufacturing TV tubes, many installations were auctioned and the market was plenty of used 4" diffusion pumps.
Another industry that employs diffusion pumps is that make vacuum deposition metallic films (chrome deposits on plastic accessories for cars).
May be you can start with a used/old system.
My suggestion is to start the design of your system with the diffusion pump in order to adapt the rest of the elements to the flanges that come with it.
Good luck!

Joep Stuyfzand
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Re: [Requist] Looking for vacuum equipment (NL)

Post by Joep Stuyfzand » Wed Oct 17, 2018 11:51 am

Thanks for the reply!

I recently contacted my local technical university (Delft) if it's possible to use their pump. This is not possible unfortunately.
Electron microscope or mass spectometry businesses are also few and far between. I am still looking for these and keeping a close eye on ebay.
I hear alot about sub 100$ pumps on ebay, however, I only saw one with 300$ shipping!

I heard that quite a decent amount of people here live in the Netherlands. I'd love to hear about their sources for fusor related equipment.
My search is not resulting in much, I won't stop however. besides, there is plenty to do aside from sourcing a pump.

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Dennis P Brown
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Re: [Requist] Looking for vacuum equipment (NL)

Post by Dennis P Brown » Wed Oct 17, 2018 12:46 pm

Repeat post
Last edited by Dennis P Brown on Wed Oct 17, 2018 1:01 pm, edited 3 times in total.

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Dennis P Brown
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Re: [Requist] Looking for vacuum equipment (NL)

Post by Dennis P Brown » Wed Oct 17, 2018 12:46 pm

A few words: first, shipping deuterium gas is a nightmare - period. It requires very special hazard/explosive controls and that cost makes shipping a pump overseas look small in comparison. Rather, you will want heavy water (D2O) and use a electrolysis to convert into gas. A number of people here have done that with success.

Next, it is possible to get Chinese made vacuum pumps fairly cheap - of course, one gets what they pay for but it might work as a fore pump for a diffusion pump (but then a gate valve would be essential, too.) Ebay deals do occur - especially for power supplies so keep looking.

Yes, I got two large, high end two stage vacuum pumps for under $50 total cost each on ebay but shipping here in the US is cheap. Ditto for a turbo ($10) with its controller and it still works after ten years. How this is done requires skill and knowledge and the ability to see something that every one else overlooks.

Experience in seeing and then how to bid is a skill one must master to achieve such results - don't do bidding wars. Decide on a price; then put in your first very low ball bid early. Then at the very last possible time, submit your final, decided its worth it best price bid (this takes a bit of skill so your bid gets in before it closes but no one has time to see and then counter your bid.) I win 95% of the time and pay a very low price for an item I really need/want. But of course it certainly is not the lowest possible cost I could get if I'm willing to lose most times. Using this method I get the item I really need way below what I'd pay if I got into a bidding war with other parties.

Learning to see items that appear worthless but are hidden gold is not an art I can teach - experience with equipment and what one can do and can't do with repairs matters in case the item needs work (generally, I only bid on returnable items just in case I can't handle any issues); only you know what skills you can master or do have already. Getting surplus is a gamble no matter what and one has to accept there will be issues from time to time.

You need to realize that a fusor is useless without a neutron detection system (to prove one has fusion.) That is not easy nor cheap unless you can handle the complex electronics - Russian tubes have climbed in price but that is your best source; however, if a vacuum pump is creating budget problems, then I might suggest a demo fusor using a cheap Chinese pump and a neon sign transformer is your best route.

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Donald McKinley
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Re: [Requist] Looking for vacuum equipment (NL)

Post by Donald McKinley » Fri Oct 19, 2018 12:09 am

There are some Vacuum pumps available cheap at UC Davis as of 10-15-2018. Have to pick them up though. See the attached brochure.
I'll post this in the trading post as well.
DM
Attachments
Mystery Monday At Aggie Surplus 10-15-18.pdf
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