The machinist and tool maker's instructor, containing an easy method of calculating and laying out difficult work in the machine shop .. (1896)
Genung, Edward. [from old catalog] · New York [Press of J. B. Savage, Cleveland] · leaf 178
tud and gear on screw or screw gear. The screw gear and first gear on stud are the drivers andthe others the driven gears. Usually those gears are of suchratio that the work is advanced more than an inch whilemaking one turn, and thus the spirals, cut on milling ma-chines, are designated in terms… … The feed screw of the spiral bed has four threads to theinch, and forty turns of the worm make one turn of thespiral head spindle; accordingly, if change gears of equaldiameters are used, the work will make a complete turn whileit is moved lengthways 10 inches; that is, the spiral willhave a lead…
Machinery
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