double-acting hammer

double-acting hammer

[¦dəb·əl ¦ak·tiŋ ′ham·ər]
(metallurgy)
A forging hammer in which the ram is raised and forced down by a charge of air or steam.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The system works with gravity-drop or double-acting hammers of 1000- to 50,000-lb capacity.