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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...and for a variety of ornamental purposes. It consists of a square shank, of a convenient length for being held in the tool-holder of the slide-rest, within which is a steel spindle, having at one end a grooved pulley, and at the other end a screw, and also a central hole for the attachment of the drills or cutters. These having various forms of cutting edge (examples of which are given in Fig. 171), produce by their revolutions a great variety of beaded and other patterns. Or, by substituting for these round or flat-sided drills, and giving them a horizontal motion by means of the slide-rest, grooves of corresponding sections can be cut either parallel or transversely to the axis of the work. Extending the system of imparting the motion to the tool instead of to the work, a slight addition to the revolvingholder just described enables us to dispense altogether with the eccentric chuck for engraving such patterns as those Fig. 171. Revolving Cutters for Or namental Turning. Fig. i72.--Eccentric Cutter. given in Fig. 165. For this purpose the cutter, instead of being attached concentrically to the spindle, is fixed in a holder which can be made to travel along a cross-slide; as shown in Fig. 172. The holder can be adjusted by means V. 'Geometric' and ' Rose' Ornament. 175 of a milled-headed screw and can be firmly clamped at any part of the slide, graduations on the head of the screw enabling it to be accurately set, so as to describe any circle whose radius does not exceed the length of the slide. Series of intersecting circles can then be traced on the face of the work as before described, their positions being arranged with the assistance of the divided plate of the mandril instead of the eccentric chuck. By an ingenious but slightly complicated arrangemen...

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9781130807066

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