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 352
hilst the copy makes one revolution, the guide must makeso much of one revolution, or so many, as shall traverse the tool thespace required between each thread of the copy; and this is accom-plished by selecting change wheels in the proportions of these quan-tities of motion, or, in other words, in… … 348 SCREW-CUTTING TOOLS. are required ; the two wheels must be respectively in the proportionsof the fractions T%, T6?, T6Si, §, §, §, |, the guide being constantly thenumerator. The numerator also represents the wheel on the man-drel, and the denominator that on the guide-screw; any multiples…
Metal-work · Electrometallurgy · Metallurgy
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