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Old 30th October 2009, 03:56 PM   #21
Pano is offline Pano  United States
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And a lot of glue!
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Old 31st October 2009, 12:03 AM   #22
gedlee is offline gedlee  United States
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Originally Posted by Moondog55 View Post
I see the problem being with having a smooth finish on the outside and consistent wall thickness
If the mold in on the outside then the outside will be as smooth as the mold - just like fiberglass. Because the binder is a glue getting it to not stick to the mold will be an issue. It wouldn't stick to the silicone mold material that I use, but that stuff is outrageously expensive and making an enclosure mold out of it would be very expensive. Just remember things like draft and for an enclosure a two part mold would probably be required. There are lots of videos on how to make molds for architectural pieces and those techniques would work. I don't see why wall thikcness needs to be consistant. It's an interesting idea if its cheap enough - recycled paper wouldn't be expensive, plaster is and so is PVA glue, so those would have to be minimized. Pound for pound its hard to beat MDF - I mean thats what you are making right?
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Old 31st October 2009, 02:59 AM   #23
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Paper mache uses water mixed with flour as a glue, that's cheap. When I use a mold I cover the mold with glad wrap. It is cheap and it either peels off or can easily be sanded off. Old 1970s plastic light shades, the big garish plastic half domes would make good molds. big stainless steel bowls are also good. Look in the kitchen cupboards, has to be something in there. Kiss the wife on the way out.

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Old 31st October 2009, 04:47 AM   #24
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MDF as paper maché? Hmmm... it kinda is. But more regular and with a different binder.
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Old 31st October 2009, 06:15 AM   #25
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Old 7th December 2009, 04:53 AM   #26
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I just grabbed some 24" inflatable beach balls on e-pay to use as speaker forms. I intend to soak strips of paper in diluted PVA glue (I already have a gallon of the stuff), and lay it up. A good idea would be to also include some anti-mildew compound in the glue mix.Anyway, it's something to do with all the old bills and junk mail and old catalogs, etc. A couple of Mouser/Digi-Key catalogs would have more than enough mass for a dandy speaker cabinet.
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Old 18th February 2010, 12:39 PM   #27
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@wrenchone, did this ever work out, any pics?
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Old 18th February 2010, 12:44 PM   #28
Magura is offline Magura  Denmark
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You should ping Carpenter, he has some experience with casting this material.

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Old 18th February 2010, 02:14 PM   #29
srinath is offline srinath  United States
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People build houses out of paper mache. The key to making a 2 story structure stand and be equal to 2X4 construction is ~5% portland cement. Mix that in and its golden.
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Old 18th February 2010, 09:34 PM   #30
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My children do a lot of papier mache modelling. They started with scrap newspaper, but nowadays they use kitchen paper towels. They conform to curves better. The result is thicker and "deader" than newsprint papier mache. Use the cheapest paper towels you can find, the expensive ones are often heavily embossed to improve their water absorption but this makes the surface too rough.

You could experiment with varying density for damping - heavily embossed paper towels to provide a thick, light core, then plain towels over that, finally heavy paper for the outer layers.

They use standard woodworking PVA glue thinned 50% with water. I like the portland cement idea, I'll try it.
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