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 343
French mandrel mounted in awooden frame, and with tin collars cast in two parts ; the upperhalves of the collars are removed to show the cylindrical necks ofthe mandrel, upon the shaft of which are cut several short screws.In ordinary turning, the retaining key Jc, which is shown detachedin the… … lar key, except that their circular arcs are screw-form instead ofangular. In screw cutting, Jc is depressed to leave the mandrel atliberty; the mandrel is advanced slightly forward, and one of thescrew-keys is elevated by its wedge until it becomes engaged withits corresponding guide-screw, and…
Metal-work · Electrometallurgy · Metallurgy
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