Presenting the Body Mold for an Injection Molded Part

   The pictures below show the core and cavity of the body of the Batarang Yoyo. The core is relatively simple and reflects the outward facing shape of the yoyo to the user. It is essentially a bored-out hemisphere with a smooth finish to allow a clean look for the finished product and eliminate the chances of snags on the yoyo during use. The cavity encompasses all of the details of the yoyo design which are not outward facing including the hole for the shoulder bolt, the edge for resting the thermoformed face on, and a ridge to include a press-fit for the cap of the yoyo. The ejection pin holes were placed on the flat ridge of the cavity as that proved to be the optimal ejection location and additionally none of the ejection marks will be able to be seen once assembled. The following images show the features described above in the molds. 

Cavity for the body of the yoyo. Notice the bored out hole for the shoulder bolt, the ejection pin holes, and the ridge cutout beyond the ejection pin holes for the press fit.

 Core for the body of the yoyo. A relatively simple outer facing part only with a hole bored through the middle to allow for insertion of the shoulder bolt during injection molding runs.

Both cavity (left) and core (right of the body of the injection molded yoyo.

Brief discussion of  needed rework:

   Before performing the optimization runs, the runners for the body injection mold needs to be added. Furthermore, the ejection pin holes and runners both need to be added to the core injection mold. Team Batarang is working closely with the machine shop to complete these remaining aspects of the mold and expect to finish during lab time this upcoming week.