Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . cient rake is given to the tool to obviate this defect, it will, under a heavycut, spring in. It is, however, well adapted to cutting out curves, or taking finishing cuts on wrought-iron work°which is so strong and stiff as not to spring away from it, because it can be used with acoarse feed without leaving deep or rough tool- or feed-marks ; it should, however, always be usedwith a slow speed. On coming into contact with the scale or skin of the metal, in case the work willnot true up
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . cient rake is given to the tool to obviate this defect, it will, under a heavycut, spring in. It is, however, well adapted to cutting out curves, or taking finishing cuts on wrought-iron work°which is so strong and stiff as not to spring away from it, because it can be used with acoarse feed without leaving deep or rough tool- or feed-marks ; it should, however, always be usedwith a slow speed. On coming into contact with the scale or skin of the metal, in case the work willnot true up, it is liable to spring away from its cut. If held far out from the tool-post, it is apt tojar or chatter; and unless the work and the tool are both firmly held, it is liable to cut deeper intothe softer than into the harder parts of the metal. The angles or sides of a cutting tool must notof necessity be quite flat (unless for use on slight work, as rods or spindles), but slightly curved, andin all cases rounded at the point, at least as much as in the tool shown in Fig. 2721. If the angles 2720. 2753. were left flat and the point sharp, the tool would leave deep and ragged feed-marks; the extremepoint, wearing away quickly, would soon render the tool too dull for use, and the point would be aptto break. For the finishing cuts of heavy cast-iron work, which is not liable to spring, the broad square-nosedtool shown in Fig. 2722 is the best. On ordinary cast-iron work a feed can be used with this toolalmost as broad at a cut as the nose of the tool itself ; providing, however, that it is set in position?with great exactitude, so that its flat nose or front will be even or true with the face of the work itis intended to cut, and that it is held as close in to the tool-post as it can conveniently be; and that,if fed by hand, it be fed evenly, because all tools possessing a broad cutting surface are subservientto spring, which spring is always in a direction (as in this case) to
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