Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 213
uponthe cutting points incidental to drillingthrough soft into hard rock with a positivefeed is thus avoided. The tubular drill-rod jiasses through thescrew-shaft and is lielil firmly by a eliuck, the;....,,. i/,.iui..ii.! .h .11 motion of the serew-shaft being thus com- municated to the… … DRILLS, ROCK. 197 gear to run loose; then the screw-shaft will run up with the same motion which carried itdown, but with a velocity sixty times greater—that is, the speed with which the screw-shaftfeeds up is to tiie speed with which it fed the drill down as sixty to one—the revolving veloci-ty in…
Mechanical engineering
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
