Manufacturer of [Copy] Single Jet Water Meter for Oman Manufacturer
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Here is a method I tried to make a core box. The wooden pattern for the casting was made with the internal shape formed also. Plaster of Paris was used to make a male mould and then this was used to make the female core box. Sodium Silicate and CO2 were used to harden the core. See part 10 of this series to see how a core is used in a greensand mould.
In this video Bre Pettis and Joe Grand teach you how to use a multimeter!