# The Grain Hewn Shop Notes ยท https://hewn.build/shop-notes/the-grain AI-drafted, not yet checked: Drafted by Chip, the writing system Hewn runs on Claude, from Hewn's craft corpus. Jonathan Salomons has not read this note yet, and no outside reader has checked it. Read it as a shop note: check a number before you cut to it. Cite as: "The Grain." Hewn Shop Notes, hewn.build/shop-notes/the-grain. Drafted 2026-04-23; AI-drafted, not yet checked. --- Five posts about the hand plane so far. The iron, the setup, the pass, the skew, the edge. Every one of them covered something you control. This one covers something you don't. You don't set grain direction. You discover it. And the worst moment to discover you had it wrong is the first pass. ## Why This Matters A hand plane cuts wood fibers at an angle. When you're going the right direction, the iron slides along the fiber direction and separates them cleanly. The fibers themselves help make the surface smooth. It's one of those things that feels like the tool is doing nothing, which is exactly the point. Reverse direction and the iron lifts the fibers ahead of the blade. The grain opens under pressure, the edge catches fibers rising instead of closing, and it pulls chips out from below the surface. That's tearout. Pits. Lifted patches. Broken surface that no amount of passes will fix without removing more wood than you wanted to lose. The difference between those two outcomes is which way you pushed the plane. ## Three Reads, Thirty Seconds You read grain direction before you touch the plane. Three checks, in order of speed. **Edge grain.** Look at the long edge of the board. The growth ring lines tell you which direction the fibers run upward toward the show face. Fibers running upward left to right means you plane right to left. The iron closes fibers at their exit angle instead of lifting them at entry. Ten seconds. Right about 80% of the time. **Surface feel.** Run your hand along the show face in both directions. One direction feels fractionally smoother. You're reading which way the surface fibers naturally lay. With the grain, they close under your palm. Against, they resist. Takes practice, but it's the fastest mid-session check once you trust it. **Raking light.** Low-angle light, near-parallel to the surface. The grain lines angle slightly in one direction across the board. Plane with those lines, not across them. When the light tells you something different from the edge grain, trust the light. It's reading the actual surface. You're reading an inference. Three reads, thirty seconds. Now you know which way the wood wants to be cut. ## The First Pass Tells You If the shavings are continuous and the surface is clean, you're with the grain. If the shavings break early or you see small lifted patches, you're fighting it. Those patches are fibers exiting the surface at the wrong angle. This is not a "take one more pass and see" situation. It won't get better. Reverse direction. The iron hasn't taken enough to ruin the surface yet. This is the recovery moment, and it only exists right now. ## When It Gets Complicated Straight-grained quartersawn stock reads cleanly and stays that way across the full width. Flat-sawn clear stock usually reads cleanly but can change near the edges where ring curvature bends the fiber angle. Then there's Bigleaf Maple. BLM has interlocked grain. The fiber direction reverses as it spirals up the tree. On the face of a BLM board, the grain runs one way for a section, then reverses. You're not looking for one direction across the whole board. You're looking for where the grain changes. Plane with one section and you're against another. The adaptation: tight cap iron, 0.3 to 0.5mm from the edge. Tight mouth. Light passes. Accept that some sections need the skew and others don't. Or reach for the card scraper and stop pretending the plane is the right tool for every inch of the board. Figured wood works the same way. Curly maple, quilted maple, birds-eye. The figuring is caused by wavy or dimpled grain, and a wave that goes up-grain in one spot goes against it six inches later. The cap iron does more work on figured wood than on any other species. Tight cap iron first. Adjust everything else around it. ## What To Do When the Grain Fights Back The skew helps. Beyond that, you have three moves. **Steeper cutting angle.** A standard bevel-down plane cuts at 45 degrees. You can't change that by adjusting the plane. But a bevel-up plane with a 50 or 55-degree blade manages difficult grain better. If you're working BLM or figured maple regularly, the bevel-up plane isn't a luxury. It's the right tool. **Close the mouth.** Tight mouth plus tight cap iron together manage even interlocked grain in most species. Open mouth and loose cap iron are for fast stock removal. Close mouth and tight cap iron are for difficult grain. Match the setup to what the surface is showing you. **Card scraper.** There's no shame in it. The scraper cuts at a steep angle with a hook, not a bevel. It doesn't tear the way a plane does. For a small section of difficult grain in an otherwise cooperative board, the scraper is faster than fighting the plane through it. Know where this option is before you start the session. Not after you've created a problem. ## The Grain-Sharpening Connection This one's worth remembering. Difficult grain dulls a plane iron faster than cooperative grain. BLM and Teak are the worst offenders. Silica content in BLM, natural oils in Teak, both accelerate edge degradation. When you know you're working interlocked or figured stock, start with a fresher edge than you'd need for straight-grained domestic wood. The cap iron and mouth adjustments buy forgiveness. But they're borrowing against the edge. The edge is still the baseline. Post 95 said the wood tells you the edge is going before you feel it. With difficult grain, the gap between "shavings say it's going" and "surface confirms it's gone" is shorter. Read faster. Respond earlier. ## The Rule The pass, the set, the skew, the edge. They all interact. Grain direction is what determines which of those variables you reach for on any given board. Read it before the first pass. Adjust to what you find. Read it again when the board changes. The grain is not your opponent. It's information.