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If my half pattern is placed face down, and sand rammed over it, what is to stop the sand filling the top cavity where the core will eventually go?That needs to be filled in solid, like the first picture of my green RustonTo make the core box, I presume that I first have to make a positive cast of the cavity, then from that make a female mould, and from that make the sand core. Is that correct? It can be done by taking a mould from your existing pattern but generally you just have to get used to working in reverse and would form the corebox straight from woodSorry for all the questions, but I am really having problems getting to grips with the process. At this rate, I might still end up using it to keep my pencils in!!
Thanks Graham and Jason for all your help and advice. In the video, the first half of the pattern is placed flat side down on a board, the box placed around it, then sand packed over it and rammed down. The box is then turned over and the pattern removed. In the example shown, the flat surface extends to the whole outline of the half pattern, but that is not so in my case.If my half pattern is placed face down, and sand rammed over it, what is to stop the sand filling the top cavity where the core will eventually go?To make the core box, I presume that I first have to make a positive cast of the cavity, then from that make a female mould, and from that make the sand core. Is that correct? Sorry for all the questions, but I am really having problems getting to grips with the process. At this rate, I might still end up using it to keep my pencils in!!