Liam David Fusor Update

Current images of fusor efforts, components, etc. Try to continuously update from your name, a current photo using edit function. Title post with your name once only. Change image and text as needed. See first posting for details.
Roberto Ferrari
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Re: Liam David Fusor Update

Post by Roberto Ferrari » Fri Oct 23, 2015 5:18 pm

Hi David

Manufacturer claims it can be mounted in any position.
I will leave a manual at Files forum.
Good luck!

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Liam David
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Re: Liam David Fusor Update

Post by Liam David » Sat Oct 24, 2015 1:10 am

Thanks!

Alex_Nicholas
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Re: Liam David Fusor Update

Post by Alex_Nicholas » Sat Oct 24, 2015 6:26 am

That's a nice looking setup Liam. As someone looking to move from a demo fusor into neutron production your fusor has just become my goal. It looks so clean/simple and well organised. Great work to date and I look forward to seeing your progress.

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Liam David
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Re: Liam David Fusor Update

Post by Liam David » Sat Oct 24, 2015 12:48 pm

There are some less professional parts of the setup that I'm not too proud of and that you can't see in the pictures, but thanks for the compliments. Smaller 2.75 conflat fusors don't produce as many neutrons as a 6" sphere or other larger chambers, but I went with this chamber because of costs.
-Liam David

Alex_Nicholas
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Re: Liam David Fusor Update

Post by Alex_Nicholas » Mon Oct 26, 2015 11:41 am

Cost is a big concern for me as well. I'd love to be able to nail a large fusor but something in the 3" sort of realm is far more walletable. I can do a lot of the work myself although finding materials here can be difficult. Namely high voltage gear. It's seemingly not very common in Australia. I will figure something out. As we always do in this field.

As a very wise man once said, Physics is like sex. Sure, it has some practical applications... But thats not why we do it.

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Liam David
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Re: Liam David Fusor Update

Post by Liam David » Sun Nov 01, 2015 2:51 pm

When I ran the turbo pump again today, I noticed that it made a loud "gurgling" sound for about the first ten seconds of acceleration and last 30 seconds of deceleration- otherwise it runs fine. I looked into the outlet with the pump spinning slowly and noticed that the rotor was vibrating slightly. I took the oil cap and rotor nut off, but the rotor does not come out. Can I force the rotor out with something like a bearing puller, or will this damage the pump? When the base is unscrewed, it does not come off, but does cause the rotor to seize. Does anyone have any experience disassembling a Pfeiffer TPU-040?

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Liam David
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Re: Liam David Fusor Update

Post by Liam David » Wed Nov 25, 2015 9:24 pm

Another problem. I discovered that the top magnet ring in the turbo pump is cracked in two places. Could this be the cause of the rotor vibration?

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Bob Reite
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Re: Liam David Fusor Update

Post by Bob Reite » Sat Nov 28, 2015 12:26 am

Unless you are experienced with working with very tight machining tolerances and rotation speeds up to 90,000 RPM, I would not try to disassemble the pump. As long as it is quiet when it is up to speed and it's pulling the vacuum you need, I'd leave it alone. If not, I'd bite the bullet and send it off to a reputable rebuilder.
The more reactive the materials, the more spectacular the failures.
The testing isn't over until the prototype is destroyed.

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Liam David
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Re: Liam David Fusor Update

Post by Liam David » Sat Nov 28, 2015 1:49 pm

It makes some sort of a "gurgling" noise as it spins up- no liquids- but vibration. The "gurgling" noise fades out as it accelerates. I can also wiggle the rotor side to side if I push gently on it.

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Liam David
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Re: Liam David Fusor Update

Post by Liam David » Wed Dec 16, 2015 8:48 pm

I have contacted a repair company and they say that when the magnet rings are cracked, the pump is irreparable. Is this true? The pump rotor can be disassembled with a spanner wrench, and ultimately everything had to be assembled, including the magnet rings, so...?

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