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.

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More by ArtificerMade:Steampunk Stump Shrinking - Hammer Forming Concave Shapes in Brass Sheet Soldering Brass to Stainless Steel plus How-To Make Flux Steampunk Prosthetic Hand  for a Wounded Warrior Pt. 1 [Now More Pics] 
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