In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstancesthe hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter.I believe that this made him angry; at least he ordered me to take off my shoes also, and their inside was carefully examined.
Director
"But are you sure? Where are the French now, and where did the British land?"Bruce shrugged his shoulders indifferently.97All moving parts must of course be independent of fixed parts, the relation between the two being maintained by what has been called running joints.Hetty laughed. It was past eleven, and Lawrence was going down to his club for an hour. The little girl had been a bit more fretful than usual.