Fig. 968.
Fig. 969.
In [Figs. 967], [968], and [969], are represented the facing tool, side tool, or knife tool, as it is promiscuously termed, which is sometimes made thicker at the bottom as in [Fig. 969]. It is mainly used for squaring up side faces, as upon the ends of work or the sides of heads or collars. a is the cutting edge which may be ground so as to cut at and near the end, for large work in which it is necessary to feed the tool in with the cross slide, or to cut along its full length for small work in which the longitudinal feed is used. To facilitate the grinding, the bottom may be cut away, as at b in [Fig. 968].
In some practice the bottom b, [Fig. 969], of the tool, is made thicker than the top a, which is, however, unnecessary, unless for heavy cuts, for which the tool would be otherwise unsuitable on account of weakness. For all ordinary facing purposes, it should be made of equal thickness, which will reduce the area to be ground in sharpening the tool.
Fig. 970.