Of iron planes, the most important is the No. 5 jack plane, 14 inches long, and having a cutter 2.inches in width, as illustrated in Fig. 24. When the pattern lumber has first been roughly planed in a planing mill, this No. 5 plane can be used almost exclusively for planing and pattern making.
In making or in truing up very large surfaces, or in making long glue joints, the No. 7 jointer plane, 22 inches long and having a cutter 2 3/8 inches wide, will be found necessary. This plane is shown in Fig. 21, and differs from the jack plane only in its length and in its extra width of face.
For mahogany or other hard wood, the No. 4 smooth plane, illustrated in Fig. 25, will be found very useful. This plane is made in several sizes. The No. 4, which is 9 inches long and has a 2-inch cutter, is the best size for general use, particularly for smooth surfaces.
Fig. 24. Jack Plane.
Fig. 25. Smooth Plane.
Next in importance to the three planes already mentioned, is the block plane, illustrated in Fig. 26. The No. 19, which is 7 inches long and has a cutter 1 3/4 inches wide, is the most desirable for the pattern maker's use. It has an adjustable throat, as well as the screw and lateral lever adjustments of the other planes.
Fig. 26. Block Plane.
Fig. 27. Scrub Plane.
This plane has the advantage of being so constructed as to be held easily in one hand, a fact which makes it especially adaptable for for short work. Owing to the low angle at which the cutter is placed, it works more smoothly and easily on end wood and on miters than any other plane.
In cases where lumber must be dressed from the rough, without being first roughly dressed in a planing mill, the No. 40 scrub plane, illustrated in Fig. 27, will be almost indispensable. It is 9 1/2 inches long, and has a cutter 1 1/4 inches wide. The cutter is a single iron, and is ground and sharpened very rounding on the cutting edge, as shown in Fig. 27, to allow of cutting a very thick shaving without grooving at the edges. This plane works rapidly and easily, preparing the rough-sawn surfaces of planks for the finishing planes.
For truing and smoothing circular arcs and curves of all kinds, either convex or concave, there is no tool that equals the circular plane, illustrated in Fig. 28. This plane has a flexible steel face which can easily be shaped to any required arc or curve by turning the knob on the front of the plane.
Fig. 28. Circular Plans.