Triad Group Presents How It's Made- Plastic Molding

[nshan214]

This video is good for the students

[Nakayama1812]

In the video they make a remark about using the EDM for fine details. It is important to note that the machine they are referring to, is a sinker EDM. In addition to cutting fine details, sinker EDM machines can also be used to create surface texture or to cut shapes that a CNC machine cannot. They also mention that the EDM electrode is copper but it can also be made from graphite. Good Video.

[thegreeneyeseesyou]

@Nakayama1812 I agree, I can see where they use copper instead of graphite. Graphite breaks down time after time. Depending on the finish of the graphite electrode, they could lower the amperage and burn slower but still would leave nasty elox scale. Which the mold will have to be polished. In this case plastic molds ( depending on final product required finish ) I've seen at a mirror like finish. Especially for clear plastic! They didn't mention the ejector pin system and how it works.