ONE of the simplest and cheapest methods yet devised to augment cutting tool life, and at the same time increase cutting speeds, is described in these two papers by the authors, who pioneered in developing the novel hi-jet system, which substitutes a fine, forced jet of oil for the customery flood type of lubrication during cutting operations.
In Part I, Mr. Pigott reviews the improvements resulting from applying cutting liquids in the hi-jet manner. He compares the results with those obtained under the former system. He also describes the adaptations of various recording instruments and other improvements developed during the running of hi-jet tests.
In Part II, Mr. Colwell describes many practical applications of hi-jet. Mr. Colwell considers the method to mark a revolutionary advance in the art of removing metal. He points out that the combination of cooling plus oil vapor lubrication supplies the factor which has produced superior results.