A professional who installs ship machinery, such as propelling machinery, auxiliary motors, pumps, ventilating equipment, and steering gear, working from blueprints and using handtools, calipers, and micrometers.

• Lays out passage holes on bulkheads, decks, and other surfaces for connections, such as shafting and steam lines.
• Installs below-deck auxiliaries, such as evaporators, stills, heaters, pumps, condensers, and boilers and connects them to steampipe systems.
• Tests and inspects installed machinery and equipment during dock and sea trials.
• May set up and operate such machine shop tools as lathe, boring mill, planer, shaper, slotter, and milling machine to fabricate replacement parts.