Centrifugal casting machine having vacuum assist
A centrifugal casting machine includes a rotatable shaft having a mounting plate for receiving a pair of molds containing the casting cavities. 
A passage in the shaft has one end connected to a source of vacuum and the other end opening in the plate. A conduit is provided from the casting cavities to the exterior of the molds. 
Connection means are provided for applying the vacuum in the passage to the cavity through the conduit. The vacuum so applied improves both the operation of the casting machine and the quality of the castings.