The additive manufacturing method first appeared in the United States in the 1980s. This method, which is distinct from the subtractive manufacturing method that involves turning, milling, and planing pliers, was developed in the United States. It has been around for more than thirty years now. This additive manufacturing technology, also known as 3D printing, first came to the attention of the...

Within the parameters of this discussion, "investment" is synonymous with "putting on clothes or coverings."After first covering the sacrificial wax object with a covering or ceramic and then burning out the wax to leave a perfect cavity in the refractory material, a metal object can be literally reproduced from the sacrificial wax object. After that, liquid metal is poured into the cavity, and...