Reply by CaptainKlutz

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Posted on Vacuum pump,question

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1335 posts in 1879 days

#1 posted 01-29-2018 12:12 PM

Yes. One caution:
Have done a lot of vacuum bag composite lamination work, and can share that will not need low vacuum capabilities of typical refrigeration/A vacuum pump. Standard plastic vacuum bag materials can/will fail if you use too much vacuum. So when using any “high” vacuum pump (<1000um capable), and you will need to add a bleed off valve, or some type of automatic vacuum control valve monitoring the bag pressure.

Since it is almost impossible to have zero leak vacuum bag assembly, you typically leave pump running until the assembled is cured. This creates problems for refrigeration pumps: With many leaks, you may need more cfm than refrigeration pump is capable of pulling, or If you have minimal leaks, must have something to limit the pump from creating more 27-28 inches of vacuum in bag. Be sure you have a pressure gauge near the bag entry point.

If run vacuum bag assembly for long period without bleeder/control, once you are able to pull 29+ inches vacuum on a bag assembly, you will likely walk away and then return to find the bag ripped open at seems (or holes in bag).

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

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