Woodworking Tip of the Day: Winding Sticks — Finding Twist Before You Plane It Worse

Before you chase a board flat with another shaving, stop — twist hides until the winding sticks show it….. A board that rocks on three corners, a sole that won’t sit, a glue-up that walks — that’s wind. Today’s tip: a pair of winding sticks, and how to read them before you plane a good board worse.

Why it matters: Popular Woodworking and Fine Woodworking both treat winding sticks as essential layout tools — not museum pieces. Two matched straightedges at opposite ends of the stock amplify twist so your eye can see what a square never will. On a Marblehead gunning dory sole blank or a wide thwart blank, that magnification keeps you from removing wood from the wrong corner.

Materials

• Pair of winding sticks — shop-made from quartersawn hardwood, 18″–24″ long (Popular Woodworking), or two lengths of aluminum L-bar (Fine Woodworking tip)
• Contrast on one stick’s top edge — dark inlay, tape, or permanent marker so the far edge reads clearly
• Center marks on both sticks (pencil, marker, or brass pin)
• Chalk or pencil to mark high corners on the board

Tools

• Jack / scrub / jointer plane (or jointer) for removing the high spots
• Straightedge check — one winding stick doubles as a straightedge for cup and bow
• Optional: calipers or a fingertip feel-check to confirm the two sticks match before you trust them

Steps

1. Make (or grab) a matched pair. Quartersawn hardwood stays truer than flatsawn. Aim for 18″–24″ — longer sticks magnify more and still fit a toolbox. Plane both edges straight and parallel. Narrower top edge (trapezoid profile) is easier to sight. Or skip the millwork: two aluminum L-bars, centers marked, one top edge contrasted (Fine Woodworking #316).
2. Check the sticks against each other first. Hold the top edges together and look for light; set both on a known-flat surface and feel the tops. Australian Wood Review’s point: if the sticks disagree with each other, every board you “fix” is a lie.
3. Place at opposite ends. Center each stick on the face (use the mid marks). Sticks should sit at right angles to the board’s length. For a long sole or panel, also check mid-span by moving the far stick while leaving the near one put.
4. Sight across the tops. Crouch so your eye is level with the near stick’s top edge. Look toward the far stick’s contrasting edge. Parallel = no wind. A wedge means twist — the high corners are the diagonal pair where the far stick rides up.
5. Mark high corners, plane those first. Chalk the high spots. Take shavings off those corners (scrub or jack). Drop the sticks back, re-sight, and watch the wedge close. Don’t full-length plane until the sticks line up — otherwise you’re chasing twist around the board.
6. Convert measured gap to actual twist if you need a number. Lee Valley’s formula: Ta = Tm × (W / L) — actual twist equals the gap you see at the stick ends, times board width over stick length. Example: 1/4″ measured on 18″ sticks across an 8″ board → about 7/64″ of real corner-to-corner wind. Amplification is roughly L / W (300 mm sticks on a 150 mm board ≈ 2×).
7. Finish flat after the wind is gone. Once the sticks are parallel, switch to full-length passes until the face is clean. Same sighting trick works across gunwales or sheer clamps when you’re checking a hull for twist on the strongback — longer sticks, same parallel read.

MOAM’s shop note: Don’t trust a single glance with the sticks swapped. End-for-end / side-for-side like you’d check a level — if the wedge follows the board, the board is twisted; if it follows the sticks, your sticks are. And don’t celebrate parallel sticks as “done.” Parallel only means the twist is out — you may still have cup or hollow to plane off before that sole lands flat in the boat.

MOAM Out.