Darryl Keil Last Activity 2025-05-12 11:03 AM
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mike mcnerney

Posts: 87

Joined: 2003-07-17
Location: ottawa ontario

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Subject : curved bagging
Posted : 2011-01-14 10:25 AM
Post #36245
I am gluing some veneer to a curved piece which is already glued up and ridgid. It is 2 x 10 x 72.The curve is a 96" radius. I am putting the piece in a 4' x 8' bag. The veneer is taped down & then I put breather mesh on top of the veneer, seal the bag & start the pump. It seems to really take forever to get up to 25HG. Do I need a caul too? What am I missing here?
Mike McNerney


 
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Darryl Keil

Posts: 1454

Joined: 2003-05-22
Location: Maine

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Subject : RE: curved bagging
Posted : 2011-01-15 10:34 AM
Post #36249 - In reply to #36245
Mike,

What are you using for a breather mesh?

Darryl Keil


 
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mike mcnerney

Posts: 87

Joined: 2003-07-17
Location: ottawa ontario

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Subject : RE: curved bagging
Posted : 2011-01-15 11:31 AM
Post #36250 - In reply to #36249
The mesh you sell. I layed a 2' x 8' mesh underneath my work & a 1' x 8'
piece on top. It seems to be working well now. I'd say 60 to 90 seconds to evacuate the bag.
Any other comments appreciated.
MM


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: curved bagging
Posted : 2011-01-15 7:27 PM
Post #36252 - In reply to #36250
Was this all on top of a grooved bottom platen? Did the mesh extend to the access hole to the vacuum hose?


 
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mike mcnerney

Posts: 87

Joined: 2003-07-17
Location: ottawa ontario

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Subject : RE: curved bagging
Posted : 2011-01-16 7:17 AM
Post #36253 - In reply to #36252
I doubled up the mesh at the access hole along with a small 3/4" round piece of ply for the brass nipple so it remained square to the bag. I did not use a grooved platten, but still have a more complicated curve shape to do so maybe I need that too. I guess I thought the mesh eliminates the need for the grooved platten? Would you put it over or under the mesh? In other words, substrate, veneer, mesh, platten? Or, substrate, veneer , platten, mesh? Remember these are all curved panels, so I can make a platten out of 1/4" bendy ply,
MM


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: curved bagging
Posted : 2011-01-16 12:05 PM
Post #36254 - In reply to #36253
The grooved platen simply provides an excellent pathway for air inside the bag to reach the vacuum hose. Without an easy pathway it will take longer for the air in the bag to be withdrawn.
A bulkier object requires the bag drape down its sides, so your full width platen may not allow enough bag to drape. I have a 3' wide grooved platen I use when I need a bit of drape but not too much. When I need more drape, I have to work without a grooved platen and rely solely on mesh to provide a pathway for air in the bag to reach the vacuum hose. the mesh is coarse enough to dent a wood surface so I usually have a 1/4" thick piece of melamine board between the mesh and the object I'm pressing. If you're using foam to life the object, the foam would easily collapse into the mesh so again a stiff flat piece of something under the foam may be helpful. If this isn't clear continue with questions.
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