OT Vacuum Pump Help Neede

Re: OT Vacuum Pump Help Neede

Anthony

>www.precisionplus.com/pumpmodels.php Here is one site.There are a few more for Edwards ED50.Just use your search engine and type in Edwards ED 50 vacuum pump. Hope this helps.

Re: OT Vacuum Pump Help Neede

Anthony

>Here is a link I found by typing in Edwards ED50 vacuum pump in a search engine.Hope this helps.www.absolutevacuum.co.uk/services/olderpumps.php

Re: OT Vacuum Pump Help Neede

Dan Faux

>Thanks Anthony

Ihave contacted about twenty different similar site (including the one posted) and whereas they can all sell me parts ets, no one can supply any literature.Hence my desperate post...

Thanks again for response

DanF

Re: OT Vacuum Pump Help Neede

Bill Howatt

>I don't know how many British lurkers there are on this site but the newsgroup rec.crafts.woodturning has some and they may be able to help since Edwards is/was a British firm. I see now it is combined with BOC.

Bill

Re: OT Vacuum Pump Help Neede

Darryl Hansen

>Try bill Noble at www.wbnoble.com he is very knowlegable about vcuum stuff and willing to help.

Re: OT Vacuum Pump Help Neede *LINK*

Mike Brazeau

>Dan - this is a laboratory vacuum pump that runs in an oil sump. In my previous life I was involved with spectrometers that used such pumps (including Edwards) to evacuate oxygen and other gases so we could look in the ultraviolet region of the spectrum. I am not sure how effective it is going to be in an environment where moisture is getting drawn into the pump. The heat of frction in the pump may be enough to evaporate the water out of the oil. In the long term I think it would corrode the interior and you would lose efficiency. You require special vacuum pump oil. I would think an old dairy vacuum pump from a milking machine would be a good choice for the application. Edwards is a division of British Oxygen. Web site is listed below.


BOC Edwards

Re: OT Vacuum Pump Help Neede

Dan Faux

>Hi Mike

Thanks for the info, I have just changed the oil in the pump and what came out was a light coloured sludge.After letting it settle in a jar it has separated and the oil is sitting on top. Would this be caused by the moisture as you stated.The moisture content of the log dropped from 50% to 21.5% in about three days so the moisture has to go somwhere.There is a twist knob on the pump and the guy that sold it to me said it was for "boiling the water out of the oil" this is why I need operation details.

Thanks again

Dan

Re: OT Vacuum Pump Help Neede

Mike Brazeau

>I would expect that you would have somewhat of an emulsion, due to the constant agitation of the oil in the sump. With time it would separate if just standing. A good deal of the water will have passed out the pump exhaust. You probably should put something on the exhaust port to filter out oil particles so they don't get into your shop environment and into your lungs.

Those pumps have steel vanes rubbing on the steel walls of the housing. If the vanes or walls corrode you will lose efficiency. I don't know what the knob would be. Could be another vent that would burp the oil more. I never dealt with water much. We had them on Mass Spectrometers where organic solvents and compounds were bleeding into the pump and would accumulate. The oil had to be changed frequently. In the other use, it was just a vacuum cavity with virtually no bleed and the oil was changed annually as a PM.

I know guys that have found milking machine pumps for very good prices and used them for vacuum chucking which is real overkill. I would think they would be best suited to a vacuum kiln because they are designed to be used where there is a lot of water in the vacuum system.

Interesting to see the number of postings recently about vacuum kilns.

Mike