. Appleton's dictionary of machines, mechanics, engine-work, and engineering. sm andobliquely) until the hook is eutirely lost. This avoids such frequent recurrence to the forge fire, but it•is a departure from the right principle to allow the point to extend beyond the centre line o. TOOLS, TURNING. 771 The works of the lathe and planing-machine frequently present angles or rebates, chamfers, groovesand under-cut lines, which require that the tool should be bent about in various ways, in order thattheir edges may retain as nearly as possible the same relations to all these surfaces, as the or
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. sm andobliquely) until the hook is eutirely lost. This avoids such frequent recurrence to the forge fire, but it•is a departure from the right principle to allow the point to extend beyond the centre line o. TOOLS, TURNING. 771 The works of the lathe and planing-machine frequently present angles or rebates, chamfers, groovesand under-cut lines, which require that the tool should be bent about in various ways, in order thattheir edges may retain as nearly as possible the same relations to all these surfaces, as the ordinarysurfacing tools, Figs. 3631 and 3632, have to the plane a b. For instance, the shaft of the tool Fig.^3631, when bent at about the angle of 45 degrees, becomes a side cutting and facing tool, as shown inplan in Fig. 3634, in elevation in Fig. 3635, and in perspective in Fig. 3636; and irr like manner thecranked tool, Fig. 3632, when also bent as in Fig. 3634, becomes Fig. 3637, and is also adapted to work-ing into angular corners upon either face. 3634. 3636. Mr. Nasmyths tool-gage, shown in elevation in Fig. 3638, and in plan in Fig. 3639, entirely removesthe uncertainty of the angles given to these irregular bent tools; for instance, when the shaft of the toolis laid upon the flat surface and applied to the iron cone c, whose side measures about 3° with the per-pendicular, it serves with equal truth for s, the tool for surfaces; p and/, the side-cutting tools, usedalso for perpendicular cuts and fillets; and u for under-cut works. 3638.
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
