Definition
A metal-forming machine that shapes sheet metal or forgings by raising a heavy weighted ram and letting it fall onto a die holding the workpiece. The impact of the falling ram forces the metal to take the shape of the die. Used in aircraft manufacturing to produce contoured sheet metal parts and forged components.
Plain English
A heavy machine that shapes metal by lifting a big weight and dropping it onto the metal, pressing it into a mold below.
Context Anchor
Seen in aircraft maintenance and repair work, especially when forming aluminum sheet-metal parts.
Derivation
Named literally for what it does: a hammer (the heavy ram) that is dropped. The shaping force comes from gravity and the weight of the ram, not from a powered downward stroke.
Why Pilots Care
A correctly formed metal part is less likely to have weak spots, cracks, or poor fit that could affect the aircraft’s condition.
Intuition Check
Do not picture a hand hammer being dropped by a mechanic. A drop hammer is a controlled shop machine that uses a falling weight to shape metal.
Example Sentence 1
The contoured engine cowling panels were formed on a drop hammer using a matched die set.
Example Sentence 2
Mechanics inspected the drop hammer dies before beginning the next production run of brackets.