Sinking (metalworking)
METALWORKING TECHNIQUE
Dapping block; Dapping blocks; Doming block; Doming punch; Dapping punch; Doming technique
Sinking, also known as doming, dishing or dapping, is a metalworking technique whereby flat sheet metal is formed into a non-flat object by hammering it into a concave indentation. While sinking is a relatively fast method, it results in stretching and therefore thinning the metal, risking failure of the metal if it is "sunk" too far.