Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 211
On the upper end of the boring-bar shown at a, Fig. 2552, is placed the geer by which the proper mo-tion is given to the feeding-screws. On the end of each feeding-screw is placed a small pinion, wliichseers into the inner teeth of a wheel which is loose on the top of boring-bar, and of course does… … with it. This wheel has teeth on the inner and outer 6ides of its periphery; the outer teeth gcer intoone of a set of two wheels wliich turn together, and are placed on a fixed pivot, independent of theboring-bar. The upper wheel of this set geers into the upper wheel a, which is keyed to the…
Mechanical engineering
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