Hi all,

Just thought I'd post a couple of pictures of the vacuum pump I was
talking about last month. It's a little Edwards ED 35 two stage pump
which I found in a local laboratory's skip (dumpster) last year and have
spent a bit of time restoring. I had the motor rewound, repainted it,
stripped and cleaned the pump and fitted new springs and seals, and
mounted it on some anti-vibration feet. Now it works very sweetly and
holds its vacuum for more that a week after I switch it off. I'm
planning to use it for some experiments on electrical discharges in low
pressure gases. I'm meaning to create a web page with some pictures of
the restoration, but so far I haven't got round to it, so I thought I'd
share a couple of pictures.

Pump as found:
http://www.mythic-beasts.com/~cdt22/vp_as_found.jpg

Pump restored:
http://www.mythic-beasts.com/~cdt22/vp_restored.jpg

Enjoy,

Chris

On Sun, 18 Sep 2005 03:53:57 +0000 (UTC), Christopher Tidy
wrote:

Hi all,

Just thought I'd post a couple of pictures of the vacuum pump I was
talking about last month. It's a little Edwards ED 35 two stage pump
which I found in a local laboratory's skip (dumpster) last year and have
spent a bit of time restoring. I had the motor rewound, repainted it,
stripped and cleaned the pump and fitted new springs and seals, and
mounted it on some anti-vibration feet. Now it works very sweetly and
holds its vacuum for more that a week after I switch it off. I'm
planning to use it for some experiments on electrical discharges in low
pressure gases. I'm meaning to create a web page with some pictures of
the restoration, but so far I haven't got round to it, so I thought I'd
share a couple of pictures.

Pump as found:
http://www.mythic-beasts.com/~cdt22/vp_as_found.jpg

Pump restored:
http://www.mythic-beasts.com/~cdt22/vp_restored.jpg

Enjoy,

Chris

Chris, what vacuum can this pump pull?

Don Foreman wrote:
On Sun, 18 Sep 2005 03:53:57 +0000 (UTC), Christopher Tidy
wrote:


Hi all,

Just thought I'd post a couple of pictures of the vacuum pump I was
talking about last month. It's a little Edwards ED 35 two stage pump
which I found in a local laboratory's skip (dumpster) last year and have
spent a bit of time restoring. I had the motor rewound, repainted it,
stripped and cleaned the pump and fitted new springs and seals, and
mounted it on some anti-vibration feet. Now it works very sweetly and
holds its vacuum for more that a week after I switch it off. I'm
planning to use it for some experiments on electrical discharges in low
pressure gases. I'm meaning to create a web page with some pictures of
the restoration, but so far I haven't got round to it, so I thought I'd
share a couple of pictures.

Pump as found:
http://www.mythic-beasts.com/~cdt22/vp_as_found.jpg

Pump restored:
http://www.mythic-beasts.com/~cdt22/vp_restored.jpg

Enjoy,

Chris


Chris, what vacuum can this pump pull?

I think the official manufacturer's figure is of the order of 0.0001
torr if everything is working perfectly. But I haven't measured the
ultimate vacuum as I don't have a working vacuum gauge. I do have some
ancient Penning gauges and a controller I might try fixing sometime, though.

Chris

"Christopher Tidy" wrote in message
...
Don Foreman wrote:
On Sun, 18 Sep 2005 03:53:57 +0000 (UTC), Christopher Tidy
wrote:


Hi all,

Just thought I'd post a couple of pictures of the vacuum pump I was
talking about last month. It's a little Edwards ED 35 two stage pump
which I found in a local laboratory's skip (dumpster) last year and have
spent a bit of time restoring. I had the motor rewound, repainted it,
stripped and cleaned the pump and fitted new springs and seals, and
mounted it on some anti-vibration feet. Now it works very sweetly and
holds its vacuum for more that a week after I switch it off. I'm planning
to use it for some experiments on electrical discharges in low pressure
gases. I'm meaning to create a web page with some pictures of the
restoration, but so far I haven't got round to it, so I thought I'd share
a couple of pictures.

Pump as found:
http://www.mythic-beasts.com/~cdt22/vp_as_found.jpg

Pump restored:
http://www.mythic-beasts.com/~cdt22/vp_restored.jpg

Enjoy,

Chris


Chris, what vacuum can this pump pull?

I think the official manufacturer's figure is of the order of 0.0001 torr
if everything is working perfectly. But I haven't measured the ultimate
vacuum as I don't have a working vacuum gauge. I do have some ancient
Penning gauges and a controller I might try fixing sometime, though.

Chris


Try www.belljar.net for some neat vacuum experiments and information, Chris.

Garrett Fulton

On Sun, 18 Sep 2005 19:38:54 +0000 (UTC), Christopher Tidy
wrote:


Chris, what vacuum can this pump pull?

I think the official manufacturer's figure is of the order of 0.0001
torr if everything is working perfectly. But I haven't measured the
ultimate vacuum as I don't have a working vacuum gauge. I do have some
ancient Penning gauges and a controller I might try fixing sometime, though.

Chris

1 micron? Nice!

When time permits, I would love to see those pages covering the
restoration.

Great job!! I love it when an useful piece of equipment is saved from
the jaws of the landfill.

TMT

Try www.belljar.net for some neat vacuum experiments and information, Chris.

Garrett Fulton

Nice site. Thanks!

Chris