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Drop hammer
A forging hammer that drops vertically onto the work piece. Usually relying on a powered cylinder to lift the hammer head and then adding to the force of the downward stroke. Originally steam powered but most now using compressed air. Steam hammers converted to air are generally not as good following conversion as the air does not expand in the same way as steam leading them bouncing off the work piece where a hit the work piece and continue to be forced down by the expanding steam.
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