40797Re: [hobbicast] cement sand mold
- Jan 4, 2011Ernie
Very nice casting, did you carve runners and vent the mould?
I don't suffer from insanity I enjoy it!
--- On Tue, 1/4/11, ferrman1001 <ferrman1001@...> wrote:
From: ferrman1001 <ferrman1001@...>
Subject: [hobbicast] cement sand mold
Date: Tuesday, January 4, 2011, 11:35 PM
I have uploaded photos of a cement sand mold used to make a cast iron surface plate. No pattern was used, instead strips of timber were clamped together and cement sand mixture is rammed in and left to set. I use 10% cement by weight to the sand and use 5% water. It takes two days to set and the pieces are left in the sun to dry out. This method is handy when you do not want to make a pattern. Molds can be stored for a long time until you are ready to cast. The blocks of sand were glued in place using silicon gutter sealent. The photos are in the photos section under "cement sand mold."
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