A study was conducted to determine the feasibility of lubricating worm gears with bonded solid film lubricants. An apparatus for determining gear efficiency and lubrican film wear-life was fabricated. Several tests using conventional oil lubrication were conducted to establish baseline gear efficiency data. Efficiency and wear-life tests were made with four solid lubricant films, two of them incorporating MoS2and Sb2O3in organic polyimide resin binders, and two using MoS2, graphite and gold or bismuth in an aluminum phosphate or sodium silicate binder. Experimental data indicate that solid film lubrication of worm gears is feasible, without a serious loss of efficiency in situations where limited wear-life is acceptable.Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Chicago, Illinois, October 17–19, 1967.