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 334
be nearly twice that at the top. The figures show the original taps, master taps, or cutters, fromwhich the dies, Figs. 421, 423, and 425, are respectively made ; andin each of the three diagrams, the dies a are supposed to be in theact of commencing, and the dies b in finishing, a screw of the… … 421. 423. 425. Of course the circumstances become the more perplexing thegreater the depth of the thread, whereas in shallow threads theinterference may be safely overlooked. As the dies cannot have 330 SCREW-CUTTINa TOOLS. both diameters of the screw, it becomes needful to adopt that curva-ture…
Metal-work · Electrometallurgy · Metallurgy
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