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I was thinking about using a vacuum bag for gluing and I was wondering if I can use the vacuum pump that I have for extracting oil. It seems to draw a pretty appreciable vacuum. Since the most expensive part of vacuum bagging is the pump and given that it would be one less thing to store, I'm wondering if I can get double duty by using this pump. Thoughts?

Mityvac 7400 7.3 Liter Fluid Evacuator : Amazon.com : Automotive
 

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Any vac pump for gluing must be able to hold it's vac pressure until the adhesive dries or sets. Most pumps accomplish this by cycling on and off when the vac pressure reaches a certain low and high point. A manual pump will not allow for that.
 

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Consider building a venturi pump with parts from Joe woodworker. Then all you need is your air compressor.
 

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I was thinking about using a vacuum bag for gluing and I was wondering if I can use the vacuum pump that I have for extracting oil. It seems to draw a pretty appreciable vacuum. Since the most expensive part of vacuum bagging is the pump and given that it would be one less thing to store, I'm wondering if I can get double duty by using this pump. Thoughts?

Mityvac 7400 7.3 Liter Fluid Evacuator : Amazon.com : Automotive
This is designed to remove fluids. It will not generate a strong enough vacuum for a vacuum bag application.

Take a look at the site Joe's Woodworking. He has a lot of information on vacuum systems, bags, etc.
http://www.joewoodworker.com/veneering/welcome.htm

You need either a compressed air venturi system or a dedicated vacuum pump.

One example of a compressed air venturi system by Hold Fast.
http://www.packardwoodworks.com/Mer...=packard&Category_Code=lathes-acc-vc-holdfast

The method to pull the vacuum is the most expensive part of the system.
 
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