Intro: Steampunk Stump Shrinking - Hammer Forming Concave Shapes in Brass Sheet
This is a pretty rough basic tutorial on achieving concave shapes in sheet metal using a hammer and a stump. This video shows a few techniques including shrinking (sometimes called dishing),sinking, and a glance at raising. Sorry I don't stop and explain terminology as I go I just show how a shape is produced from start to finish in a rather free-flowing manner. Enjoy.