The tool itself should be so forged that one side is flush with the side of the tool steel as shown at a in [Fig. 1668], for if there is a shoulder, as at c, it sometimes prevents the tool from entering the work as shown in the figure.
Other examples in the use of this tool holder are given in [Figs. 1669] and [1670].
Fig. 1669.
In [Fig. 1669], we have the case of cutting out the V-slideways of a planer bed, and it is seen that the tool point may be held close to the holder, the side of the tool box still clearing the side of the V-slideway, whereas in the absence of the holder the tool would require to have a considerable bend in it, or else would have to stand out from the bottom of the tool apron to a distance equal to the length of one side of the slideway.
Fig. 1670.
In [Fig. 1670] it is also seen that by the use of the holder the tool point may also be held as close as necessary to the holder, and still permit the side of the vertical slide s′ and the tool box b to clear the vertical face of the work.