Patent ID: 6405810
Filing Date: 2002-06-18
Classification: E21B,F16N

Abstract:
A method of lubricating an object, comprising the steps of:ejecting a volume of lubricant under pressure through a spray nozzle, without mixing the lubricant with air under pressure, to generate an airless spray of lubricant; directing the spray on a rotating object; and synchronizing the duration of spray to the rotation of the object so that the spray continues only for an interval of spray time corresponding to rotation of the object through a predetermined range of rotation; wherein the object is a threaded shaft comprising a section of drill rod, and wherein said method further comprises spraying said threads during said interval of spray time, said lubricant being ejected through said nozzle at a pressure of 3000 psi or greater; said method further comprising rotatably mounting said drill rod section in a vertical boring machine and operating the boring machine to rotate the drill rod section.