Quote:
|
Vanes, fins... whatever you call them, it's all mold flash. This is caused by the mold faces not closing tight together.
|
But, there is the "fins" caused by too much pressure (lead forced out into vent lines), too much Tin, too hot. But they are usually not a problem, other than annoying...they can just be ignored and pressure (do not hold sprue hole tight against bottom pour spout), heat, technique adjusted to eliminate them.