Thread Forms for Worms and Hobs

The use of worm gearing is steadily increasing, and accompanying this increase, perhaps the cause of it, is a corresponding increase in efficiency and durability which is the result of a better understanding of both the theoretical and mechanical problems. This paper points out some of the problems involved and some of the mechanical difficulties in the use of worm gearing, for failure to take these problems and difficulties into consideration in the past has often led to the discrediting of this form of drive. It also suggests methods for bringing about a uniform and satisfactory practice in worm gearing.