The smoothing plane is usually much smaller than the jack plane, as it is not expected to take off so much material and there does not have to be so much leverage. In construction it is similar to the jack plane, and may be made of either wood or iron. Very often, however, it is without a handle, as no great force is required to operate it. The trying plane is longer than the jack plane and is used after it so as to obtain a truer surface on the piece of timber than is possible with the jack plane. It is also used for edging boards, and it is narrower than either the jack plane or the smoothing plane. Figs. 27. and 28 show two wood-bottom smooth planes, one with a handle and one without, and Fig. 29 shows a smooth plane with an iron bottom.

In Fig. 30 is shown a sectional view of both a wood and an iron smooth plane, with the various pieces numbered, and in Fig. 31 are shown some of these same pieces separately with the same numbers attached to each. The names of the various parts are as follows:

Fig. 29. Iron Bottom Smooth Plane

Fig. 29. Iron-Bottom Smooth Plane.

Trying And Smoothing Planes 020037Fig. 30. Sections of Wood Bottom and Iron Bottom Smooth Planes

Fig. 30. Sections of Wood-Bottom and Iron-Bottom Smooth Planes.

No. 1 is the "plane iron," and should be made of steel, well tempered and ground. It should be throughout of the same thickness.

No. 2 is the "plane iron cap," also of steel, the purpose of which is to protect the plane iron.

No. 3 is the "piano iron screw," which fastens the plane iron cap to the plane iron.

No. 4 is the "rap" (or "cap iron"), which holds the plane iron in place, and it is fastened to the "frog" by means of the "cap screw," No. 5.

No. 6 is the "frog," which acts as a support for the plane irons, and which is fastened to the body of the plane by the "frog screw," No. 10.

No. 7 is the "Y" adjustment, the end of which fits into an opening in the plane iron cap, and makes possible the close adjustment of the position of the plane iron. The adjustment is made by means of the brass "adjusting nut," No. 8.

No. 9 is the "lateral adjustment," by means of which the plane iron can be shifted very slightly sideways in the plane, if necessary, so as to bring it parallel with the edge of the bottom of the plane, where it passes through the slot.

No. 11 is the "handle," which is fastened to the bottom of the plane by the "handle screw," No. 15, and by the "handle bolt and nut," No. 13.

No. 12 is the "knob," fastened to the bottom by the "knob bolt and nut," No. 14.

No. 16 is the "bottom" of the iron plane, while No. 18 is the "bottom" of the wood plane.

No. 17 is called the "top casting" and occurs only on the wood bottom plane.

Fig. 31. Details of Parts of Smooth Plane

Fig. 31. Details of Parts of Smooth Plane.