Abstract
When a cylindrical gear is cut by a hobbing machine, the tooth frank is usually formed by feeding the cutter along the axis of blank rotation. In making a gear of small face width it is difficult to eliminate the long idle time which takes up a large proportion of the total machining time because it must usually includes the stroke time for approaching and receding from the work in addition to the net tooth width feeding time. A new system employing a specially shaped hobbing cutter can drastically improve the efficiency in hobbing especially for a gear having a small face width, e. g. a ring gear in F. F. automobile, only by subjecting the gear to tooth profile shaping while simultaneously cutting the tooth trace. The fundamental analysis and the examination on infeed hobbing was performed. Hob profile suitable for the infeed hobbing was obtained and the paths of contact and the limit of meshing between the hob and the gear was analyzed. An infeed hob was manufactured. and a gear made by the hob was found to be available for use as a roughing blank before shaving.
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