A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 46
t-edge and arc,slide and stand, can be accurately shaped byordinary methods, but the shaping and plac-ing of the tool A requires considerable skill. The chief requirement is that the rack toothshall be formed of four equal odontoids,a, b, c, d, Fig. 14, placed symmetrically withrespect to the pitch… … Con^ttgating tooth equal to each other and properly placed onthe pitch and center lines. It is also desir-able, although not essential, that at theirjunction the curves should be tangent to thesame straight line T. It is a matter of merely secondary practi-cal importance that the originating…
Gearing
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