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There are a number of questions which arise in discussions on gear lubricants and a few are listed below: 1. What is the purpose of a lubricant? 2. What would be the characteristics of a gear that would operate without lubrication? 3. Is it possible to produce such a gear? 4. How important is surface finish? 5. Is the same degree of surface finish desired or necessary in all instances? 6. Is it necessary to use lubricants of high viscosity? 7. Does the sliding velocity determine the viscosity of the lubricant, or the surface finish desired? All machined surfaces are made up of hills and dales. The finer the surface finish the smaller are the hills and dales. If two such machine surfaces are in contact and if it is desired to move one with respect to the other, interference between the hills on the two surfaces make it necessary to apply a force to produce motion. If the hills and dales on the two mating surfaces are so arranged that every hill on one falls into a dale on the other, and if the faces of the hills are perpendicular to the direction of the desired motion, it will be impossible to produce motion unless a force is applied of sufficient magnitude to shear off the hills. The shearing off of the hills results in heat being generated.
Collins, L. J.
Engineer, General Electric Co., Schenectady, N. Y.