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Extra info for Diy Foundry - Metal Casting Made Easy
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Gleaned from over Fourteen years of Practical Metal Casting experience Written & compiled By Col Croucher. Copyright: June 2003. Written by Col Croucher Australia. You are entitled to one Printed edition of this ebook, please respect my copyright and intellectual Property. 49 Complete guide to hobby metal casting. Building a propane gas fired furnace. Introduction. Efficient melting of any metal requires a well designed & easy to operate furnace. A well-designed furnace does not necessarily mean the furnace is complicated to construct or operate.
This is the very reason we said to colour match one corner of your mould boxes to avoid this mistake. You think I got mad when I saw this… You bet… Only one solution, scrap the casting (& remelt it), and re-mould & pour it again! Cold Pour or Cold Shut. The metal was poured way to cold; it cooled even more while traveling through the cool sand and stopped right at the casting cavity. Sometimes a low sprue height will also cause this to happen. A combination of factors can at times confuse you to what actually caused the problem.
If you took these images and placed them back-to-back you would note that all the parts of this layout would match up together. The hole in the mount board between the patterns on the right (above) is used to place the down sprue to secure it while the sand is being rammed. The long runner joins up with the short in-gates attached to the patterns. The lower bosses on the underneath of the pattern board will match up with the top part of the pattern. The boss is bored out to accept a thread at a later stage of the production.