08-25-2013, 02:37 PM
(This post was last modified: 08-25-2013, 02:37 PM by the artfull-codger.)
Well here's my two penneth worth!!
No1, 5ml boiled linseed oil,8 dessert spoons of dry fine sand [windblown beach or kiddies play sand], about 15ml water & 1 teaspoon of dextrin,I usually put a teaspoon of bentonite in to give it green strength[not essential] then bake in the oven@200c till solid. strong cores!!
No2,1x raised teaspoon of cereal binder [standard stuff from john winters foundry supplies uk] 5x level tablespoons of dry sand & water to suit then bake as usual [dead easy to make!!]
No3,co2, injected with a fine hollow needle from ''pub gas'' bottle,or you can leave it in the workshop for a few days & it'll harden itself.
my preference??? well it depends on my mood,they all work well.
Graham.
No1, 5ml boiled linseed oil,8 dessert spoons of dry fine sand [windblown beach or kiddies play sand], about 15ml water & 1 teaspoon of dextrin,I usually put a teaspoon of bentonite in to give it green strength[not essential] then bake in the oven@200c till solid. strong cores!!
No2,1x raised teaspoon of cereal binder [standard stuff from john winters foundry supplies uk] 5x level tablespoons of dry sand & water to suit then bake as usual [dead easy to make!!]
No3,co2, injected with a fine hollow needle from ''pub gas'' bottle,or you can leave it in the workshop for a few days & it'll harden itself.
my preference??? well it depends on my mood,they all work well.
Graham.
the artfull-codger, proud to be a member of MetalworkingFun Forum since Feb 2013.