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Flattening a short timber board by hand does not require the longest or most expensive plane in the cabinet. For boards roughly 300–900 mm long, a well-set jack plane is usually the best starting point. It removes material quickly, bridges enough of the surface to find high spots, and is easier to control than a long jointer plane.
The right choice depends on how rough the timber is, how flat the finished board must be, and whether you also need to straighten an edge. A heavily cambered blade is useful for fast stock removal, while a lightly cambered or straight blade leaves a better surface. For most small-shop work, one good plane with two blade settings is more useful than buying three mediocre planes.
The best plane types for short boards
| Plane type | Best use | Strengths | Limitations |
|---|---|---|---|
| Number 5 jack plane | General flattening and thickness correction | Versatile, manageable, widely available | Not as fast as a scrub plane on severe stock |
| Number 6 fore plane | Flattening wider or more distorted boards | More stable and bridges hollows better | Heavier and less nimble |
| Scrub plane | Removing a lot of waste quickly | Very aggressive cut; handles rough sawn timber | Leaves deep tracks that require further planing |
| Number 7 jointer plane | Long, straight edges and larger panels | Excellent reference surface on long work | Usually unnecessary for short boards; costly and tiring |
Best overall: a number 5 jack plane
A number 5 jack plane has a sole around 350 mm long, which is a useful middle ground. It is long enough to avoid simply following every hollow in a short board, but short enough to work comfortably on a bench or workmate. For boards under about 600 mm, it is often the only bench plane you need.
Look for a plane with a rigid sole, a blade at least 50 mm wide, and an adjustment mechanism that moves the iron smoothly without excessive side play. A secondhand metal plane can be excellent if the sole is reasonably flat, the frog is secure, and the blade has enough metal left for repeated sharpening. Search for number 5 jack planes if you want a ready-to-use modern option.
Set the blade with a slight camber for flattening. On a 50 mm iron, the corners should be about 0.25–0.5 mm higher than the centre. That prevents the blade corners digging visible tracks into the board. For a final smoothing pass, reduce the projection and use a nearly straight edge with just enough rounding to avoid corner marks.
When a number 6 fore plane is better
A number 6 fore plane is about 450 mm long and has more weight than a jack plane. That extra length helps when a short board has a pronounced hollow or twist. It rides over isolated low areas instead of dropping into them, making it easier to establish a consistent reference face.
Choose one if you regularly flatten boards 600–1,000 mm long, work with wide stock, or find a number 5 too lively and easy to tip. The trade-off is fatigue. On a small board, the longer plane can feel cumbersome, particularly when working across the grain or removing only a small amount. It is a better specialist flattening tool than an all-purpose first plane.
For many users, a good number 6 fore plane makes sense only after they already own a jack plane or need its extra stability for repeated work.
Scrub planes for badly distorted timber
A scrub plane is worthwhile when the board is cupped, twisted, or substantially thicker than required. Its narrow iron and deep camber take a short, thick shaving, often 1–2 mm wide at the cut. Work diagonally across the grain and make shallow overlapping passes rather than trying to reach full depth immediately.
Scrub planes are fast, but they are not finishing tools. They leave troughs that must be removed with a jack or fore plane. On a 400 mm board that needs only 1 mm removed, a scrub plane is usually overkill and can create more work than it saves. A jack plane with a more aggressive blade setting is the cheaper and more flexible option.
How to flatten a short board accurately
Support the board firmly near both ends and close to the area being planed. If it rocks, pack the low side with thin card or wedges. Mark the face with pencil lines in a loose grid. These lines show where material is being removed and stop you from planing by feel alone.
Use winding sticks, or two straight pieces of contrasting timber, to check twist. Sight across them from one end after every few passes. Start with diagonal strokes from high corners toward the centre, then plane along the grain once the worst distortion is gone. Keep the plane moving; stopping halfway across can create a hollow at the point where pressure changes.
Take shavings about 0.1–0.3 mm thick for general flattening. A deeper cut may be appropriate in softwood, but on hard, figured, or reversing grain it increases tear-out. Plane with the grain where possible, and skew the plane 10–20 degrees to reduce the effective cutting angle and make the cut feel smoother.
New versus used bench planes
A used Stanley-style metal plane can be a bargain, but budget for sharpening supplies and possibly a replacement iron. Avoid examples with a badly pitted blade near the cutting edge, cracked castings, a missing lever cap, or a sole that has been aggressively ground hollow. Light surface rust is not a serious problem; structural damage is.
New planes offer predictable parts and easier adjustment, but inexpensive examples can have rough machining, weak irons, or soles that need significant tuning. If you want the lowest-cost route, a sound secondhand number 5 is often better than a new plane at the very bottom of the market. For a ready-made setup, compare woodworking bench planes with replacement irons and sharpening accessories included.
Small tools that make the plane work
You will get better results from an average plane used against reliable references than from an expensive plane used without them. Keep a 600–1,000 mm straightedge, a pair of winding sticks, a marking gauge, and a sharp chisel nearby. A 25–30 degree primary bevel is common for general-purpose irons; sharpen before the edge starts forcing you to push harder.
For most short boards, buy a number 5 jack plane first. Add a scrub plane only when you routinely remove a lot of stock, or a number 6 when board width and twist make the jack plane unstable. A number 7 is rarely the sensible first purchase for this particular job.