Planes for curved surfaces

Shaped edges which are convex can be worked with a smoothing- or block-plane provided the curve is not too acute, but for quick curves and concave edges a metal compass-plane is obtainable whose flexible spring steel face can be adjusted to any arc. This is an expensive tool proportionate to the amount of use which could be found for it, and given a true eye most curved edges can be worked equally well—but rather more slowly—with spokeshaves which have either a flat face for convex work or a round face for concave work. The screw-adjustable type illustrated is easier to handle than the cheaper version in which the cutter is secured with a thumb-screw and which must be set by hand. A chamfer version with two adjustable fences set at a true angle of 45° was manufactured until recently and is probably still available. For difficult woods there is much to be said for the wooden spokeshave illustrated in Figure 54A, in which the iron is flat to the wood, cutting bevel uppermost, and the writer has always preferred this type, although it is probably only a matter of individual preference. For rough and rapid shaping the carpenter's drawknife (54B) will dispose of a great deal of timber in the shortest possible time, but it must be razor sharp. In the hands of an expert it can be made to work to precision limits. It can be used bevel down for either light cutting or convex shapes, or bevel up for heavy cutting or concave shapes.

In all spokeshaving operations a slight shearing or diagonal direction to the cut will minimize any tendency to clatter or form ridges which may be difficult to eradicate.

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