Darryl Keil Last Activity 2025-09-09 11:09 AM
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Charlie Wwolfe

 
Subject : High Vacuum Pumps
Posted : 2002-02-02 1:54 PM
Post #29681
Am considering putting together my own system vor vacuum veneering. Ihave read through the current postings and got a lot of good info. I see that there are a number of vacuum pumps for sale on ebay; somediaphram but, mostly rotary vane types. The Gast systems seem ratedfor around 25 inches Hg, which would be great. Some, like the JBIndustries DV-85N and DV-142N and the Robinair 15400 series are twostage systems rated at "20 microns." After a lot of searching, Ifound out that 29.9 inches is 250 microns and a perfect vacuum is 0microns; so these pumps pull more than 29.9 inches. Obviously, that is far in excess of the 20 to 25 inches desireable forvennering work. Do you know of anything about the operation ormaintenance of these high vacuum pumps that makes them undesireablefor our work?Thanks,CW



 
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Darryl Keil

 
Subject : High Vacuum Pumps
Posted : 2002-02-04 12:39 PM
Post #29690 - In reply to #29681
Dear Charlie,Its best to stay away from pressing veneer at high vacuum, you can have problems with the bonding. If you get a micron rated pump just keep the vacuum level below 28"HG. Also high level vacuum pumps are considerably more expensive than industrial level ones. Why pay more for a capacity you dont need?SincerelyDarryl Keil: Am considering putting together my own system vor vacuum veneering. I: have read through the current postings and got a lot of good info. : I see that there are a number of vacuum pumps for sale on ebay; some: diaphram but, mostly rotary vane types. The Gast systems seem rated: for around 25 inches Hg, which would be great. Some, like the JB: Industries DV-85N and DV-142N and the Robinair 15400 series are two: stage systems rated at "20 microns." After a lot of searching, I: found out that 29.9 inches is 250 microns and a perfect vacuum is 0: microns; so these pumps pull more than 29.9 inches. : Obviously, that is far in excess of the 20 to 25 inches desireable for: vennering work. Do you know of anything about the operation or: maintenance of these high vacuum pumps that makes them undesireable: for our work?: Thanks,: CW




 
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Charlie Wolfe

 
Subject : High Vacuum Pumps
Posted : 2002-02-07 11:09 AM
Post #29696 - In reply to #29690
: Dear Charlie,: Its best to stay away from pressing veneer at high vacuum, you can have problems with the bonding. If you get a micron rated pump just keep the vacuum level below 28"HG. Also high level vacuum pumps are considerably more expensive than industrial level ones. Why pay more for a capacity you dont need?: Sincerely: Darryl Keil: : Am considering putting together my own system vor vacuum veneering. I: : have read through the current postings and got a lot of good info. : : I see that there are a number of vacuum pumps for sale on ebay; some: : diaphram but, mostly rotary vane types. The Gast systems seem rated: : for around 25 inches Hg, which would be great. Some, like the JB: : Industries DV-85N and DV-142N and the Robinair 15400 series are two: : stage systems rated at "20 microns." After a lot of searching, I: : found out that 29.9 inches is 250 microns and a perfect vacuum is 0: : microns; so these pumps pull more than 29.9 inches. : : Obviously, that is far in excess of the 20 to 25 inches desireable for: : vennering work. Do you know of anything about the operation or: : maintenance of these high vacuum pumps that makes them undesireable: : for our work?: : Thanks,: : CW




 
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Charlie Wolfe

 
Subject : High Vacuum Pumps
Posted : 2002-02-07 11:20 AM
Post #29697 - In reply to #29696
Darryl,OK, thanks for the info.I have your catalog, but do not see system pumping components broken out. Do you sell, as a separate item, the controller that cycles the pump to maintain a desired vacuum? If so, what is the price?Charlie: : Dear Charlie,: : Its best to stay away from pressing veneer at high vacuum, you can have problems with the bonding. If you get a micron rated pump just keep the vacuum level below 28"HG. Also high level vacuum pumps are considerably more expensive than industrial level ones. Why pay more for a capacity you dont need?: : Sincerely: : Darryl Keil: : : Am considering putting together my own system vor vacuum veneering. I: : : have read through the current postings and got a lot of good info. : : : I see that there are a number of vacuum pumps for sale on ebay; some: : : diaphram but, mostly rotary vane types. The Gast systems seem rated: : : for around 25 inches Hg, which would be great. Some, like the JB: : : Industries DV-85N and DV-142N and the Robinair 15400 series are two: : : stage systems rated at "20 microns." After a lot of searching, I: : : found out that 29.9 inches is 250 microns and a perfect vacuum is 0: : : microns; so these pumps pull more than 29.9 inches. : : : Obviously, that is far in excess of the 20 to 25 inches desireable for: : : vennering work. Do you know of anything about the operation or: : : maintenance of these high vacuum pumps that makes them undesireable: : : for our work?: : : Thanks,: : : CW




 
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Darryl Keil

 
Subject : High Vacuum Pumps
Posted : 2002-02-07 2:50 PM
Post #29698 - In reply to #29697
Dear Charlie,Yes we do, and it is $148. The pump cannot be more than 1/3hp for this vacuum control to work.SincerelyDarryl Keil: Darryl,: OK, thanks for the info.: I have your catalog, but do not see system pumping components broken out. Do you sell, as a separate item, the controller that cycles the pump to maintain a desired vacuum? If so, what is the price?: Charlie: : : Dear Charlie,: : : Its best to stay away from pressing veneer at high vacuum, you can have problems with the bonding. If you get a micron rated pump just keep the vacuum level below 28"HG. Also high level vacuum pumps are considerably more expensive than industrial level ones. Why pay more for a capacity you dont need?: : : Sincerely: : : Darryl Keil: : : : Am considering putting together my own system vor vacuum veneering. I: : : : have read through the current postings and got a lot of good info. : : : : I see that there are a number of vacuum pumps for sale on ebay; some: : : : diaphram but, mostly rotary vane types. The Gast systems seem rated: : : : for around 25 inches Hg, which would be great. Some, like the JB: : : : Industries DV-85N and DV-142N and the Robinair 15400 series are two: : : : stage systems rated at "20 microns." After a lot of searching, I: : : : found out that 29.9 inches is 250 microns and a perfect vacuum is 0: : : : microns; so these pumps pull more than 29.9 inches. : : : : Obviously, that is far in excess of the 20 to 25 inches desireable for: : : : vennering work. Do you know of anything about the operation or: : : : maintenance of these high vacuum pumps that makes them undesireable: : : : for our work?: : : : Thanks,: : : : CW




 
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Heath

 
Subject : High Vacuum Pumps
Posted : 2002-02-03 2:46 PM
Post #29683 - In reply to #29681
I use a Rietschle (vcb 20) pump which gives me 11-12 cfm and 29 hg, with a big reserve of vacuum and a gauge and evacuation tap on the tank. All I do is evacuate all the air I want from the tank before I start working to say 26 hg, then I stick my glue up in the bag, seal it up and open the tap slowly on the tank, taking the small amount of air from the bag and equalizng the vacuum between bag and tank down to about 25 hg. The pump was the only thing that cost any real money and that was $1700 australian, c. $900 US.




 
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Charlie Wolfe

 
Subject : High Vacuum Pumps
Posted : 2002-02-08 10:38 PM
Post #29702 - In reply to #29683
That is an expensive pump! In the states you can get 1/2 Hp 6CFM 20 micron pumps which are used to evacuate HVAC/refrigeration units. They run about $200 US in like-new condition on the online auction sites or $300 - $500 new. Industrial pumps in 1/4 to 1/2 HP and 4 - 8 CFM at 25 to 27" Hg run about the same amount.Charlie: I use a Rietschle (vcb 20) pump which gives me 11-12 cfm and 29 hg, with a big reserve of vacuum and a gauge and evacuation tap on the tank. All I do is evacuate all the air I want from the tank before I start working to say 26 hg, then I stick my glue up in the bag, seal it up and open the tap slowly on the tank, taking the small amount of air from the bag and equalizng the vacuum between bag and tank down to about 25 hg. The pump was the only thing that cost any real money and that was $1700 australian, c. $900 US.




 
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Heath

 
Subject : High Vacuum Pumps
Posted : 2002-02-10 4:53 PM
Post #29704 - In reply to #29702
I used to use a cheap one and it got too hot, and that was a minor problem. I've always had the attitude of buying the best of what I can afford and since most of what I do involves vacuum I didn't hesitate.




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