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Darryl Keil

Last Activity 2025-09-09 11:09 AM
5 replies, 2261 viewings

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Dave Blake

Subject : Any vaccuum pump will do?
Posted : 2002-02-20 4:18 PM
Post #29725

Here's a unique question. At my other job the Analytical group were upgrading their scanning electron microscope and were tossing a still functioning vaccuum pump - high end, high grade. Can I use this FREE pump to set up a veneering system? If so, other than a pressure regulator and an water and oil trap, do I need to modify the pump? Or do I have a FREE boat anchor?Your input will be appreciated.

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Darryl Keil

Subject : Any vaccuum pump will do?
Posted : 2002-02-28 10:19 PM
Post #29740 - In reply to #29725

Dear Dave,Be aware that what I call scientific level vacuum (above 29HG) is not good for pressing veneer with wood glues, its too high. You will need to find some way to reduce the vacuum level to not go higher than 28HG. Most industrial vacuum pumps max out at around 25HG when used with a cyling switch. This level is really plenty. Good luck with your pump.SincerelyDarryl Keil: Here's a unique question. At my other job the Analytical group were : upgrading their scanning electron microscope and were tossing a still : functioning vaccuum pump - high end, high grade. Can I use this FREE : pump to set up a veneering system? If so, other than a pressure : regulator and an water and oil trap, do I need to modify the pump? : Or do I have a FREE boat anchor?: Your input will be appreciated.

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Larry Root

Subject : Any vaccuum pump will do?
Posted : 2002-02-21 7:19 AM
Post #29727 - In reply to #29725

Dave,I have a used vacuum pump from an electro microscope. I bought it used with the intent to use it in a vacuum press . I contacted the mfg's tech support line and was surprised with their response. They said that the pump was DESIGNED to opperate contitiously and needed a warm up period to purge condensates from the oil and a similar period after use. They suggested that putting a pressure regulating switch would/could actually harm the pump by preventing it from purging itself. Their recommendation was to turn it on and let it run for however long the bag was sealed. You may want to contact whoever mfg'd your pump.I haven't used mine yet because I found access to a regulated pump with the necessary fittings. But, when I do, I wont't put in a pressure switch.The one down side that I've considered is that I won't be able to press at less than full pressure. While that won't be an issue very often, I cannot use panel core material at full pressure. If I had it to do over, I'd buy the system; but I didn't get the price you did.Respectfully,Larry

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Charlie Wolfe

Subject : Any vaccuum pump will do?
Posted : 2002-03-06 1:44 PM
Post #29752 - In reply to #29727

I don't see why you have to press at the full vacuum capability of your pump. I am just getting into vacuum pressing with a home brew system. My pump is a surplus Gast 0523 which pulls 25"Hg and is rated at 4.3 CFM of volume. The vacuum is fine, but, I found the evacuation rate was too fast for me to keep up with when trying to keep layups on forms straignt and such. I put a manual diverter valve at the input to the pump and start my system with it fully diverted (i.e. no vacuum being pulled from the bag). I then close the valve until I get the evacuation rate I want. I have a vacuum gauge at the valve, as well, and I use it to set the evacuation rate. 10" Hg seems to work for me. When I am satisfied that the layup is OK I close the valve and pull full vacuum. I would think you could just put a valve at the vacuum input to your high vacuum pump and simply open it until you have lowered the vacuum to what you want and then just pump away... Charlie : Dave,: I have a used vacuum pump from an electro microscope. I bought it used with the intent to use it in a vacuum press . I contacted the mfg's tech support line and was surprised with their response. They said that the pump was DESIGNED to opperate contitiously and needed a warm up period to purge condensates from the oil and a similar period after use. They suggested that putting a pressure regulating switch would/could actually harm the pump by preventing it from purging itself. Their recommendation was to turn it on and let it run for however long the bag was sealed. You may want to contact whoever mfg'd your pump.: I haven't used mine yet because I found access to a regulated pump with the necessary fittings. But, when I do, I wont't put in a pressure switch.: The one down side that I've considered is that I won't be able to press at less than full pressure. While that won't be an issue very often, I cannot use panel core material at full pressure. If I had it to do over, I'd buy the system; but I didn't get the price you did.: Respectfully,: Larry

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Heath

Subject : Any vaccuum pump will do?
Posted : 2002-02-21 4:47 PM
Post #29728 - In reply to #29727

Have a look at the posts on high vacuum pumps, good luck - Heath

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Larry Root

Subject : Any vaccuum pump will do?
Posted : 2002-02-22 6:59 AM
Post #29730 - In reply to #29728

Heath,Mine's a single stage rotary vane pump; I don't expect it to get to 28 inches, but you're right -- I'll need to check it.Thanks,Larry

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