ABSTRACT
This study describes a new equipment for gravity casting of fluidity spirals in a sand mould. The fundamental characteristic of the equipment is a constant pouring temperature, which gives a constant melt superheat and, since the molten metal is poured into the spiral sand mould form the same height, the equipment gives a constant initial pressure head and pouring velocity. By comparing the data from the earlier version of the equipment, an improvement in the reproducibility has been shown. The effect of melt superheat on fluidity has been measured by the new improved equipment and has been confirmed to increase linearly with increasing melt superheat.