Vacuum Bagging Pump size needed?

Discussion in 'Fiberglass and Composite Boat Building' started by abosely, Aug 1, 2015.

  1. rxcomposite
    Joined: Jan 2005
    Posts: 2,454
    Likes: 426, Points: 83, Legacy Rep: 1110
    Location: Philippines

    rxcomposite Senior Member

    I am currently using a recycled automobile aircon compressor hooked backwards driven by a small electric motor via v belt.
     
  2. Jim Caldwell
    Joined: Aug 2013
    Posts: 267
    Likes: 8, Points: 18, Legacy Rep: 48
    Location: Cleveland, Ohio

    Jim Caldwell Senior Member

    My first vac. run was using my v6 car engine, pulled brake booster line and adapted my vacuum line. 18" of vacuum.
     
  3. SamSam
    Joined: Feb 2005
    Posts: 3,900
    Likes: 198, Points: 63, Legacy Rep: 971
    Location: Coastal Georgia

    SamSam Senior Member

    If the pump fails, won't the laminate decompress and suck air into the laminate?
     
  4. jorgepease
    Joined: Feb 2012
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    Location: Florida

    jorgepease Senior Member

    If it decompressed after he sucked out the excess, he would just have to add more resin, I would rather have a cheap backup pump on hand.
     

  5. rxcomposite
    Joined: Jan 2005
    Posts: 2,454
    Likes: 426, Points: 83, Legacy Rep: 1110
    Location: Philippines

    rxcomposite Senior Member

    The vac bagged part should be able to hold the part minimum of 2 hours without vac. If the vac fails before the resin has set, most likely you will get a springback, pre release, or worse, resin starvation on vertical surface.
     
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