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Mar 29, 2019 · How to Form Sheet Metal With Hydraulic Die Forming. Hydraulic die forming is somewhat similar to Masonite die forming. In both, sheet metal is sunk or pressed into a die. The sheet metal takes the form of the design cut into the die.... For clean, precise holes in thin sheet metal, make a wood sandwich. Simply sandwich the sheet metal between two pieces of wood and clamp everything down on a table or workbench. The wooden ‘bread’ layers of the sandwich keep the sheet metal flat and prevent the drill bit from wandering as it bores through the sheet metal.