Spinner Mold Design

            The Core mold contains a pocket for the main disc, as well as pockets for the letters Y-O-! There are also through holes for 6 ejector pins. A ring around the main disc pocket connects to the sprue through a runner. The ring is then connected to the main disc through 6 runners, located over each ejector pin hole.

The Cavity mold consists of one large pocket to add additional weight to one half of the disc. In the middle of the mold, there is also a small circular pocket, with a depressed lip, to create a nub on the backside of the disc.

      We measured multiple parts and found that parts with similar geometry to the spinner disc often had 2% shrinkage. Therefore, all dimensions were scaled by 102% in this mold to allow for shrinkage.

      For the Core, the ejector pin holes were drilled on a mill. Then, the mold was fixture onto a CNC lathe and main disc pocket was cut. Afterwards, the mold was fixtured on a CNC mill and pockets for the letters, outer ring, and runners were milled.

For the Cavity Mold, both pockets were milled using a CNC mill.

            

Process Plan: Spinner Cavity
https://drive.google.com/open?id=0B21e-g0iDwxqaFJ4Mzl4QVFBV1k&authuser=0

Process Plan: Spinner Core
https://drive.google.com/open?id=0B21e-g0iDwxqZHlSUkthWUw0ZFU&authuser=0