Abstract
There are so many varieties and designs of castings. It must be recognized that the standard gating systems are not applicable to any design of casting, therefore we must make a preferable design to avoid many defects caused by gating system. Some attempts have been made to standardize the gating system, however there are many factors to be taken into account to decrease many defects, so that it is very difficult to fix the gating system of castings. Foundrymen have the proper design of their foundries even to simple castings. This report deals with the flow of molten metal at gates and runners so as to know the conditions of striking and splashing of metal which cause gas holes, sand inclusion and oxide film. Photographs inserted in this monograph have been taken instantaneously at 1/10000 sec.
