Simpson Sand Slingers
The first version of the Simpson Sand Slinger was introduced to the metal casting industry in the 1930’s by Beardsley & Piper. Since then, it has become a dependable method for making a wide variety of molds for thousands of foundries throughout the world. Recently slingers have again regained some popularity as an excellent way to produce large molds in low cost, environmentally friendly green sand. The modern Simpson Sand Slinger is an advanced, green sand molding system for the production of large flask molds for the production of many kinds of ferrous and non-ferrous metal castings. With today’s high powered slingers molds are rammed faster and with minimal effort to achieve uniform and maximum mold hardness on all surfaces of the mold regardless of complexity of pattern shape or depth of mold pockets.
The ancient principals of hand ramming a mold are efficiently applied when ramming a mold with a Sand Slinger. The ramming head of the Sand Slinger first rams the lowest parts of the mold and then proceeds to fill the flask, maintaining an even level of rammed sand in the flask. In the Sand Slinger rammed mold, each wad of rammed sand slightly overlaps the preceding wad. It is the extent of this overlapping that determines the mold hardness. The faster the ramming head is moved over a mold area the smaller the overlap and the harder is that area rammed. The speed of the ramming unit motor also influences mold hardness, and the Sand Slinger is provided with a dual speed ramming unit motor to provide operator selection of two ramming hardnesses.
The ancient principals of hand ramming a mold are efficiently applied when ramming a mold with a Sand Slinger. The ramming head of the Sand Slinger first rams the lowest parts of the mold and then proceeds to fill the flask, maintaining an even level of rammed sand in the flask. In the Sand Slinger rammed mold, each wad of rammed sand slightly overlaps the preceding wad. It is the extent of this overlapping that determines the mold hardness. The faster the ramming head is moved over a mold area the smaller the overlap and the harder is that area rammed. The speed of the ramming unit motor also influences mold hardness, and the Sand Slinger is provided with a dual speed ramming unit motor to provide operator selection of two ramming hardnesses.