gee-dub Posted July 2, 2020 Report Share Posted July 2, 2020 Just as the title says. Does anyone have trouble with the oil discharge from a oil based vacuum pump in a woodworking shop? Quote Link to comment Share on other sites More sharing options...
Tom King Posted July 2, 2020 Report Share Posted July 2, 2020 I wouldn't want to use mine in the woodworking shop. I open the door to the mechanic shop, and sit it outside even when I'm using it on a vehicle. The oil you have to replace in it goes somewhere, and you can see the mist in the air coming out of it. Quote Link to comment Share on other sites More sharing options...
Tpt life Posted July 2, 2020 Report Share Posted July 2, 2020 Vacuum...the air goes from the work toward the pump. Put it in a cabinet and put a hose out. Quote Link to comment Share on other sites More sharing options...
Gary Beasley Posted July 3, 2020 Report Share Posted July 3, 2020 If you get the oilless carbon vane pump it normally has a felt filter to catch any carbon dust from the outlet and one for the Inlet to catch dirt. They last an incredibly long time and are very simple to rebuild if the vanes wear out. Quote Link to comment Share on other sites More sharing options...
Mark J Posted July 3, 2020 Report Share Posted July 3, 2020 7 minutes ago, Gary Beasley said: If you get the oilless carbon vane pump it normally has a felt filter to catch any carbon dust from the outlet and one for the Inlet to catch dirt. They last an incredibly long time and are very simple to rebuild if the vanes wear out. Will they pull as much vacuum as will an "oil pump"? Quote Link to comment Share on other sites More sharing options...
Tom King Posted July 3, 2020 Report Share Posted July 3, 2020 I doubt it. Mine is a two stage. It also gets hot enough that I don't think you're supposed to put it in anything. It'll peg the gauges hooked up to a vehicle AC system. You don't need that much vacuum for a vacuum bag. Atmospheric pressure does the work, once the air is evacuated. For an air conditioning system, you have to get all the moisture out, as well as air, so it's a bit more complicated than a vacuum bag Quote Link to comment Share on other sites More sharing options...
Gary Beasley Posted July 3, 2020 Report Share Posted July 3, 2020 2 hours ago, Mark J said: Will they pull as much vacuum as will an "oil pump"? Not quite as much as a high quality oil pump, but close. Definitely good enough for veneer work. They were used for platemaking contact frames for decades, that requires tight contact. Total atmospheric pressure on a decent sized vacuum bag would be measured in tons. I know with my vacuum chuck I have to be careful how much vacuum I put on a thin wall bowl to avoid collapsing it. Quote Link to comment Share on other sites More sharing options...
Mark J Posted July 3, 2020 Report Share Posted July 3, 2020 Do you think it could pull more than 29 inches? I've been thinking about buying/building a vacuum kiln for turning blocks. Quote Link to comment Share on other sites More sharing options...
drzaius Posted July 3, 2020 Report Share Posted July 3, 2020 Forgive me, but I'm going to take this just a little off topic here. While under a vacuum for say, 24 hours, will a piece lose appreciable moisture? I'm thinking it's basically a vacuum kiln. Quote Link to comment Share on other sites More sharing options...
Mark J Posted July 3, 2020 Report Share Posted July 3, 2020 I'm not an expert on this, but I was doing some investigation on hobby vacuum kilns before the pandemic. First order answer is yes, placing wood in a vacuum lowers the vapor pressure and hence lowers the boiling point of water. But it doesn't lower it enough on it's own to dry out a large piece of wood quickly. So in the time it would take for glue to cure a piece of veneer in a vacuum press should not loose much more water than if clamped with cauls. And most of the adhesives that would be used contain some water, too. With a vacuum kiln there is also some source of heat in addition to the vacuum. In the units I'm exploring that is a mini electric blanket. 1 Quote Link to comment Share on other sites More sharing options...
Chip Sawdust Posted July 3, 2020 Report Share Posted July 3, 2020 14 hours ago, Gary Beasley said: If you get the oilless carbon vane pump it normally has a felt filter to catch any carbon dust from the outlet and one for the Inlet to catch dirt. They last an incredibly long time and are very simple to rebuild if the vanes wear out. That's the type used in general aviation airplanes with piston engines. They can last a long time, but when they fail (usually without warning) poof! But as you said, they can easily be rebuilt. Quote Link to comment Share on other sites More sharing options...
Gary Beasley Posted July 3, 2020 Report Share Posted July 3, 2020 Usually what happens is the vane wears to the point of leaking air and will lose max vacuum. Sometimes it gets dust built up in the chamber and needs to be flushed with solvent. The only time Ive had one totally fail suddenly the starter circuit in the motor burned out. Quote Link to comment Share on other sites More sharing options...
Gary Beasley Posted July 3, 2020 Report Share Posted July 3, 2020 6 hours ago, Mark J said: Do you think it could pull more than 29 inches? I've been thinking about buying/building a vacuum kiln for turning Most of the platemakers and my pump draw about 22 to 25 inches. The oil type pumps are a lot better for such high vacuum. Quote Link to comment Share on other sites More sharing options...
Robby W Posted July 3, 2020 Report Share Posted July 3, 2020 I suppose you have already considered this, but I'd you have a reasonably sized air compressor, think about a venturi pump. I have one that came in a kit I bought from on of the online veneering sites. I think it was joewoodworker. Anyway, the kit cane with all of the fittings and electrical parts. I added a switch, cord, electrical box and a couple of pieces of 4" PVC pipe with end caps. It pulls down to 5" easily, which.is plenty good for veneering. The air runs for a few minutes as the bag is pulled down. Then it cycles.once every few minutes for a 20 seconds and shuts off again. Works like a champ. No oil or other maintenance. My compressor only cycles every few hours (60 gallon tank). Quote Link to comment Share on other sites More sharing options...
Mark J Posted July 3, 2020 Report Share Posted July 3, 2020 1 hour ago, Gary Beasley said: Most of the platemakers and my pump draw about 22 to 25 inches. The oil type pumps are a lot better for such high vacuum. Ahh, thanks. That was the info I was after. Quote Link to comment Share on other sites More sharing options...
Gary Beasley Posted July 4, 2020 Report Share Posted July 4, 2020 You might want to look for a lab grade pump used if possible like the one here I sold recently. It’s only 1.5cfm but will draw darn near 30” of vacuum and is duty rated to run nonstop for 14 days. Quote Link to comment Share on other sites More sharing options...
Mark J Posted July 4, 2020 Report Share Posted July 4, 2020 Is that an oil pump? Quote Link to comment Share on other sites More sharing options...
Gary Beasley Posted July 4, 2020 Report Share Posted July 4, 2020 Yep. Came with some kind of special oil different from the usual pump oil, so you have to be up on the maintenance requirements if you find one. Quote Link to comment Share on other sites More sharing options...
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