People who've never been around molds should find this interesting. People who know molds will probably have questions. I'm not divulging much more info than what I post here. Sorry.
Here's a video of a die designed and built by the company I work at:
It's molding magnesium nuts for the auto industry. Cycle time from shot to shot is 17 seconds. Currently the nuts are being either stamped from steel or machined from magnesium bar. There is still some debugging going on. Notice the far upper and near lower parts are breaking off the runner during ejection. They're supposed to stay on the runner and be cut off with a trim die. The reason why has yet to be determined. The spray is a mold release agent. The nuts are 42mm across the hex, 5mm thick, with a
35x1.5mm thread, approximately.