Best Sharpening Stones for Chisels and Plane Blades
Sharp is not a property of the tool, it is a property of the day. A chisel that cuts cleanly on Monday will bruise the wood by Friday if it never sees a stone. The good news is that sharpening is a skill measured in minutes, and the equipment costs less than most of the tools it maintains.
The grit progression you actually need
You need three stages, and buying more than that is a way to spend money without getting sharper.
| Stage | Grit | Job | How often |
|---|---|---|---|
| Coarse | 250 to 400 | Repair a damaged edge, reset a bevel | Rarely |
| Medium | 1000 | Establish the edge | Every sharpening session |
| Fine | 3000 to 8000 | Polish the bevel and remove the burr | Every session, quick |
A combination stone with 400 on one side and 1000 on the other, plus a separate 3000 to 8000 stone, covers everything. Anything above about 8000 is for people who enjoy sharpening more than woodworking.
Water, oil or diamond
- Water stones. Cut fast, need soaking before use, and wear quickly, which is why they need flattening often. They produce the finest edge and are the standard for Japanese tools and fine chisels. Messy, and they cannot be left to freeze.
- Oil stones. Slow cutting, almost no maintenance, and they last decades. The classic choice for a shop where sharpening is a chore rather than a ritual. They are harder to find now and cut noticeably slower on modern hard steels.
- Diamond stones. No soaking, no flattening, cut very fast, and work on the hardest modern steels. They are expensive per stone and coarse diamond plates wear out. For most people, one diamond plate for flattening plus water stones for sharpening is the best combination.
Flattening is the step everyone skips
A stone that is dished will put a curve on your bevel, and a curved bevel will not cut cleanly no matter how fine the grit. Water stones dish fast. Flatten them every few sessions on a coarse diamond plate, on a flattening stone, or on wet sandpaper stuck to a flat surface like a piece of glass or granite. Draw a pencil grid on the stone first and keep going until the grid is gone. It takes a minute and it is the difference between an edge that works and one that does not.
The basic technique
- Flatten the back first. Only the last quarter inch behind the edge, but it must be flat and polished. Do this once per blade, properly, and touch it up thereafter.
- Hold a consistent angle. About 25 degrees for a bench chisel, 30 for a plane blade that sees hard use. A honing guide is not cheating, and it is worth using until your hands learn the angle.
- Work up through the grits. Do not move on until you can feel a burr along the full length of the edge.
- Remove the burr on the fine stone. A few light alternating strokes, then strop on leather or on bare cardboard.
- Add a micro-bevel. Lift the blade a degree or two on the finest stone and take a few strokes. This is what you refresh between full sharpenings, and it takes seconds.
Questions people ask
Which grits do I actually need?
Three stages: a coarse stone around 400 for repairing damage, 1000 to establish the edge, and 3000 to 8000 to polish and remove the burr. Anything finer than 8000 is for people who enjoy sharpening more than woodworking.
Do I have to flatten the stone?
Yes, and it is the step most people skip. A dished stone puts a curve on your bevel, and a curved bevel will not cut cleanly at any grit. Flatten water stones on a coarse diamond plate every few sessions.
Water, oil or diamond?
Water stones cut fast and give the finest edge but need soaking and flattening. Oil stones are slow but nearly maintenance free. Diamond plates cut hardest and need no flattening, and are the best choice for flattening everything else.
Recommended for this project
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