The practical metal-worker's assistant : containing the arts of working all metals and alloys, forging of iron and steel, hardening and tempering, melting and mixing, casting and founding, works in sheet metal, the processes dependent on the ductility of the metals, soldering, and the most improved processes, and tools employed by metal-workers, with the application of the art of electro-metallurgy to manufacturing processes : collected from original sources, and from the works of Holtzapffel, Bergeron, Leupold, Plumier, Napier, and others ... (1851)
Byrne, Oliver · Philadelphia : H.C. Baird · leaf 309
i-tudinal groove cut up the side of the screw e; now, therefore, the in-ternal and external screws travel constantly round, and nearly atthe same rate, the difference of one tooth in the wheels serving con- 304 DRILLS. tinually and slowly to project the screw c, for feeding the cut. Toshorten or… … The differential screw-drill, having a double thread in the largeworm, shown detached at/, requires 1\ turns of the handle to movethe drill once round, and the feed is one-64th of an inch for eachturn of the drill; that being the sum of 16 by 4. Drilling and Boring Machines.—The motion of the…
Metal-work · Electrometallurgy · Metallurgy
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