What's inside
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The short answer
For a small timber curve, a block plane is a good choice for easing a broad convex curve with long, accessible runs. A spokeshave is usually easier to control when the curve tightens, changes direction, or needs careful blending. If you are shaping just one shallow curve, the block plane you already own may be enough. Buying a spokeshave makes more sense if curved edges are recurring work.
Neither tool is a substitute for marking a fair curve and removing most of the waste first. Saw close to the line, leaving roughly 1–2 mm for paring and smoothing. Trying to take off that much with either tool invites tear-out and makes it harder to keep the curve even.
How the tools cut
A block plane has a sole that bridges the timber beneath the blade. It is comfortable to push along a straight edge and can smooth a broad convex curve, but its length limits how tightly it can follow a changing profile. On a narrow radius, the toe or heel may contact the work before the cutting edge can reach the surface.
A spokeshave has short soles on either side of an exposed blade. It is pulled or pushed along the curve, with both hands close to the cut. That gives good control on convex edges and lets you adjust the angle and pressure as the profile changes. It still needs a reasonably supported surface: on a concave hollow, a flat-soled shave cannot follow a tight inside radius.
For a concave curve, use a suitable curved-bottom spokeshave, a rasp, or a scraper rather than expecting a standard flat-bottom model to do the job. A small hollow may also be easier to refine with a chisel or carving tool.
Which tool suits the curve?
| Factor | Block plane | Spokeshave |
|---|---|---|
| Best fit | Broad, convex curves and straight transitions | Convex curves, tighter bends, and changing profiles |
| Control | Good on open runs; less nimble near ends and tight radii | High, with both hands guiding the cut |
| Learning curve | Familiar to anyone who planes edges | Blade setup and stroke direction take practice |
| Main risk | Flat spots or digging in where the sole loses support | Chatter, skewed cuts, or gouges from a poorly set blade |
| Buying sense | Best value if you already own one and the curve is gentle | Worth considering for frequent curved work or tighter profiles |
Choose and set up the tool
For an occasional job, start with a sharp block plane. If you need a dedicated shave, compare a basic spokeshave with the kind of curves you actually make. A standard flat-bottom version is suited to convex work; it is not a universal tool for every inside and outside curve.
Blade sharpness matters more than price. A dull edge needs more force, which makes it easier to rock the tool or tear fibres instead of slicing them. Set the blade for a fine cut: start with a shaving around 0.1–0.2 mm thick, then increase only if the tool cuts cleanly and the timber supports it. The blade should project evenly across its width. If one corner sticks out farther, it can leave a groove along the curve.
Clamp the work firmly, with the curve accessible and the waste supported. A bench hook, padded clamp, or simple scrap support can prevent vibration and bruising. Keep the marked line visible, and do not clamp so near the edge that the tool collides with the clamp.
Shape the curve without flattening it
Draw the profile clearly on both faces when the timber is thick enough for the two edges to drift apart. Remove the bulk waste with a coping saw, bandsaw, or jigsaw, staying about 1–2 mm outside the line. For a tight curve, make relief cuts in the waste up to the saw kerf so it breaks away without tearing into the finished edge.
With a block plane, take short, controlled strokes and keep the sole supported. Work from the high spots toward the line rather than making long passes that cross the whole curve. Check frequently with a flexible batten, a template, or a pencil line drawn along the edge. If the plane begins to rock or removes material only at the ends of a stroke, the radius may be too tight for its sole.
With a spokeshave, pull the tool along the grain where possible. On awkward grain, reverse direction or skew the tool slightly until it cuts cleanly; forcing a straight stroke through reversing grain can lift fibres below the line. Use light, overlapping strokes and avoid stopping with the blade planted in one spot, which can leave a hollow. If the shave chatters, check that the blade is secure and make a thinner cut.
Finish and troubleshoot
Use a straightedge or template to check the curve, but also sight along it in raking light. A curve can match the endpoints yet still contain a flat or bump in the middle. Stop planing before you reach the pencil line everywhere, then finish with a cabinet scraper or abrasive wrapped around a firm backing. A soft sanding block can round over the edge and disguise a flat spot rather than correct it.
Tear-out usually points to dullness, an overly deep cut, or unfavourable grain direction. Reduce blade projection, sharpen, and try approaching from the other end. A gouge at an endpoint often means the tool tipped as it left the work; shorten the stroke and ease pressure at the exit. If you only need to knock down a small amount on a gentle curve, sandpaper on a shaped block is a perfectly sensible alternative. It is slower to remove material, but the cheaper option is fine when the job is small and precision requirements are modest.
For repeat work, a curved-bottom spokeshave may help with concave profiles, but match its sole radius to the work rather than buying on the label alone. For a single broad convex timber edge, use the block plane you have, take thin cuts, and check the shape often.