Methods of machine shop work : for apprentices and students in technical and trade schools (1914)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York : McGraw-Hill · leaf 269
Fig. 261. Thesecond segment is a segment of a crown gear, its pitch plane(pitch cone having a cone angle of ninety degrees) being identicalwith that of the ideal crown gear tooth represented by thecutting tools. As the yoke oscillates it turns the gear blankwith it while the meshing of the segments… … GEAR CUTTING 259
Machine-shop practice
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
