Semi-centrifugal casting is used for the castings that are symmetrical about a central axis but complicated than true centrifugal castings. It is not necessary to have a central hole. A core will have to be employed if one is desired. The mould cavity is arranged within the mould so that its central axis will be vertical and concentric with the axis of rotation (Figure 20.23). A central sprue is provided which should be concentric with the vertical axis of rotation. Spinning speed is not as high as those used for true centrifugal casting. The general practice is to rotate these moulds at the rpm, which will give linear speed at the outside edge of the castings of about 600 ft/min.
Figure 20.23 Semi-centrifugal Casting
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