This chapter presents the design, manufacturing, and performance of a single-acting electro-pneumatic pile hammer, suitable for installing model piles in a laboratory calibration chamber. The performance of the hammer was evaluated by instrumenting the various components of the hammer-pile system and monitoring critical parameters such as pressure, displacement, force, and velocity. The hammer delivers a rated energy of 156 ft-lb with a 66% efficiency. The hammer can operate with the full design energy at frequencies up to 1.2 Hz, and has been used successfully to model the pile driving process in the laboratory. Sufficient details are provided so that readers can build similar hammers to suit their needs.