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#1
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Building a mold for casting resin
I'd like to try to create a top for a coffe table using resin but will need
to custom build the mold. The item would be one piece that's 48" long, 17" wide and 5/16 " thick on top, with a lower portion that would fit down into the table and would be 46" long, 15" wide and 5/8 " thick. I'd also like to embed items in the tabletop, which is what made me think of using resin for the project. I'd also like to put six small holes around the top for screws to affix the top to the table. For a project of this size, what would be the best material for creating the mold? Matt Lupo matt at lupo dot com -- G. M. Lupo a.k.a. matt at lupo dot com Up on the hill, they think I'm okay Or so they say... |
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#2
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You'd have to make a positive first out of sealed wood or such. Then I would
make a mold by building up a thin coat of a rubber molding material around the top and sides of the positve. I would then make a mother mold of plaster around that to support the rubber mold once the positive is removed. You can then pour your resin into the rubber mold. -- Dawn Stubitsch http://www.thumbprintkids.com http://www.thumbprintkids.com/pages/caketoppers.html "G. M. Lupo" wrote in message ... I'd like to try to create a top for a coffe table using resin but will need to custom build the mold. The item would be one piece that's 48" long, 17" wide and 5/16 " thick on top, with a lower portion that would fit down into the table and would be 46" long, 15" wide and 5/8 " thick. I'd also like to embed items in the tabletop, which is what made me think of using resin for the project. I'd also like to put six small holes around the top for screws to affix the top to the table. For a project of this size, what would be the best material for creating the mold? Matt Lupo matt at lupo dot com -- G. M. Lupo a.k.a. matt at lupo dot com Up on the hill, they think I'm okay Or so they say... |
#3
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Yo don't say what finish you want the top to have. If smooth, then glass
with a release agent is a good surface to get a flat, smooth surface.. Overfill the mold described below and carefully lower the glass onto the pool of resin tilted to one side to keep air bubbles from forming. "Dawn Stubitsch" wrote in message . com... You'd have to make a positive first out of sealed wood or such. Then I would make a mold by building up a thin coat of a rubber molding material around the top and sides of the positve. I would then make a mother mold of plaster around that to support the rubber mold once the positive is removed. You can then pour your resin into the rubber mold. -- Dawn Stubitsch http://www.thumbprintkids.com http://www.thumbprintkids.com/pages/caketoppers.html "G. M. Lupo" wrote in message ... I'd like to try to create a top for a coffe table using resin but will need to custom build the mold. The item would be one piece that's 48" long, 17" wide and 5/16 " thick on top, with a lower portion that would fit down into the table and would be 46" long, 15" wide and 5/8 " thick. I'd also like to embed items in the tabletop, which is what made me think of using resin for the project. I'd also like to put six small holes around the top for screws to affix the top to the table. For a project of this size, what would be the best material for creating the mold? Matt Lupo matt at lupo dot com -- G. M. Lupo a.k.a. matt at lupo dot com Up on the hill, they think I'm okay Or so they say... |
#4
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You can also sand the resin top smooth once it is pulled from the mold.
-- Dawn Stubitsch http://www.thumbprintkids.com http://www.thumbprintkids.com/pages/caketoppers.html "Seattle Communist Extravaganza!!!!!!!!!" wrote in message news:ANBNa.42945$Xm3.8871@sccrnsc02... Yo don't say what finish you want the top to have. If smooth, then glass with a release agent is a good surface to get a flat, smooth surface.. Overfill the mold described below and carefully lower the glass onto the pool of resin tilted to one side to keep air bubbles from forming. "Dawn Stubitsch" wrote in message . com... You'd have to make a positive first out of sealed wood or such. Then I would make a mold by building up a thin coat of a rubber molding material around the top and sides of the positve. I would then make a mother mold of plaster around that to support the rubber mold once the positive is removed. You can then pour your resin into the rubber mold. -- Dawn Stubitsch http://www.thumbprintkids.com http://www.thumbprintkids.com/pages/caketoppers.html "G. M. Lupo" wrote in message ... I'd like to try to create a top for a coffe table using resin but will need to custom build the mold. The item would be one piece that's 48" long, 17" wide and 5/16 " thick on top, with a lower portion that would fit down into the table and would be 46" long, 15" wide and 5/8 " thick. I'd also like to embed items in the tabletop, which is what made me think of using resin for the project. I'd also like to put six small holes around the top for screws to affix the top to the table. For a project of this size, what would be the best material for creating the mold? Matt Lupo matt at lupo dot com -- G. M. Lupo a.k.a. matt at lupo dot com Up on the hill, they think I'm okay Or so they say... |
#5
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Building a mold for casting resin
I have cast a lot of clear resin and its notoriously difficult in
large casts. perspex would be ok for the mould if the shape is simple you will get a better finish against a hard surface. Recently I have been using a clear resin that starts off blue and goes clear when cast. (from www.specialplasters.co.uk ) It is less tacky aginst rubber moulds than the previous ones. The problem being that clear resins are very air inhibited because the wax that would be added to reduce this effect makes the resin opaque so cant be added. when you embed you have to let the first layer almost set so the objects dont sink but the fist layer going of before the next causes bending of the cast. weighting it down while still green will usually flattern it. If you wait too long before adding the next layer you will see a defraction line when looking at an angle. On Sat, 5 Jul 2003 01:47:56 -0400, "G. M. Lupo" wrote: I'd like to try to create a top for a coffe table using resin but will need to custom build the mold. The item would be one piece that's 48" long, 17" wide and 5/16 " thick on top, with a lower portion that would fit down into the table and would be 46" long, 15" wide and 5/8 " thick. I'd also like to embed items in the tabletop, which is what made me think of using resin for the project. I'd also like to put six small holes around the top for screws to affix the top to the table. For a project of this size, what would be the best material for creating the mold? Matt Lupo matt at lupo dot com |
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