* Ace Member *
- Oct 19, 2016
There are only three parts to a disc mold: core, cavity and stripper. Core is the bottom, cavity is the top and stripper is the rim. There is no such thing as a spacer.
If there are differences, that means they don't share all three parts.
I think the "spacer" idea came from the fact that mold piece tooling is supposed to be really expensive. People assumed there was a cheaper way than having two wings (still not saying strippers).
I'm pretty sure, with my background actually building injection molds, I can almost 100% confirm the first two statements (although there might be a way to make a change to the stripper plate to modify geometry that I'm not envisioning. Didn't do a lot with three piece molds. Also, some toolmakers refer to the stripper plate as the "X" plate, if that's easier for you to say ThreePutt) and can definitely confirm that molding pieces are expensive.