Fig. 21. Plane Iron, Cap, and Set Screw
The cap is firmly fastened to the plane iron by a stout screw, and this whole combination is fastened in the throat of the plane by a clamp ([Fig. 22]). The opening on the bottom of the plane through which the cutting edge protrudes is called the mouth of the plane.
Fig. 22. Sectional Views of Iron Plane
9. Adjustment of Plane. There are two ways of adjusting a modern iron plane,—by means of the set screw s, and of the lever l.
Screw s lowers or raises the plane iron so that we may take a thin or thick shaving, and lever l straightens the iron, which is liable to project more on one side than on the other, and will then take a shaving thicker on one side than on the other.
Before using the plane always examine it carefully. Invert the tool, holding it toward the light with the toe toward you, and glance along the bottom. If the iron projects, observe whether it is even, and if not, move the lever until it is. For a thin shaving the cutting edge should appear as a black line of uniform thickness. For a heavy shaving turn the brass screw until the iron projects slightly.
In using the plane avoid a stooping position. Stand with the right side to the bench and with the shoulders thrown back. Let the pressure of the left hand be greater at the beginning and that of the right hand at the end of the stroke. The tool should rest perfectly flat on the wood from start to finish.