Hand or Simple Turning by John Jacob Holtzapffel

Author:John Jacob Holtzapffel
Language: eng
Format: epub
ISBN: 9780486156224
Publisher: Dover Publications
Published: 2012-10-11T00:00:00+00:00

The round tool fig. 392, the most useful of the curvilinear edged tools, varies from about one sixteenth, to about one and a half inches in width, the gradations in size below half an inch being very numerous. The smaller tools are used to turn ornaments and mouldings, the larger, for mouldings and all concaves. Small strong round tools also take the place of the gouge, more especially in ivory turning, in roughing out those parts of the work for which the latter is too large.

The quarter round tools, right, fig. 393, and left, fig. 394, are used of all sizes from about one eighth, to one inch wide; they serve to turn their exact counterparts in mouldings, for larger curves, and for those that abut against a square shoulder. The quarter hollow tools, right, fig. 397, and left, fig. 398, produce their counterparts; they are usually rather less in range of size than the quarter rounds. These three varieties, are named from the forms of the tools, and not from the shapes they produce on the work.

The bead tool, fig. 395, is used for beads as members of mouldings, and for the small spheres for bracelets, necklaces and ornament. It ranges from about one sixteenth, to one inch in width, the sizes varying very slightly in the smaller tools; the curve is rather less than the half circle. The ornament of the bead, may be turned with the point and other tools, first the one side of the curve and then the other, precisely alike, but this is sometimes difficult to accomplish especially if the bead be small ; there is also the liability of damage to the bead or the neighbouring surface, from faulty management of the point tool. The form can be readily and more correctly given to the tool, when its counterpart and duplicate beads can be turned with uniformity.

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