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Ssonerai
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08-13-2019, 07:16 PM

Martin - If the photo is what you are making, it is a very good item to vacuum bag against a form, from thin layers of veneer or laminae. You should make it oversize and allow for trimming. Whichever side you decide to make the inside curve, will be the area that might give trouble - the veneers have to slide over each other, and they have to slide down into the trough. (Whichever side: often with any sort of press-work, the face is to the form, as that is the most perfect shape and does not change based on thickness of lay-up. OTOH if pressed with the face out from the form, you have to make the form to allow for the thickness of the material. Either way, it can be useful to add some over-bend to allow for springback. A lot of thin layers laid in epoxy will barely spring back, so for gradual curves like yours, it can be made almost net shape. Just don't under-do it.

It could be pressed with a collapsible discharge hose, but that would actually be more complicated.....unless you decide to go into production and make "many".

Is your plan to put the whole thing in a bag? Easiest if you have it, as opposed to sealing an oversized form taping/sealingt membrane on one side.

Will you use a peel layer and a bleeder layer?

I use flag nylon, whatever color is on special since it does not matter, for the peel-ply; and usually just raw burlap for the bleeder.

Besides the purpose for which they are included, they help spread the force of the vacuum over the work and help keep the bag from immediately working into small gaps.

Last edited by Ssonerai; 08-13-2019 at 08:38 PM.
  
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