This guide is the procedure. What a card scraper is, why it works on difficult grain and when to use one instead of sandpaper or a plane are covered in the card scraper guide. You will need a fine file, sharpening stones, a burnisher — a hardened, polished rod — and a vice.
Preparing the edge
The hook is made from the corner where the edge meets a face, so both surfaces must be flat and smooth before it is turned (see the plate above). A new scraper with a milled edge may be ready: Veritas says its milled scrapers can be used for fine work as they come, and that the milled edge is the reference to file and stone back to later.
Preparing the edge and turning the hook
Joint the edge
Clamp the scraper in a vice, edge up, and file the long edge straight and square to the faces. Van Dyke uses a 10 in mill bastard file; Schwarz a fine single-cut file, in second or smooth cut, with push strokes only. Colouring the edge with a marker shows when the file has touched it all along.
Hone the edge
Polish the edge on a stone, keeping it at 90° to the faces — Van Dyke holds the scraper against a square block and moves the scraper, not the block.
Hone the faces
Lay each face flat on the stone and polish the band next to the edge until the file’s burr is gone and the corner is crisp. Schwarz works from about 1,000 grit to a fine stone of 4,000–8,000.
Draw the steel
Lay the burnisher flat on each face at the edge and stroke it firmly along the edge a few times — Schwarz suggests five or six — to consolidate and draw out the steel at the corner. Van Dyke then runs the burnisher square across the edge a few times to spread it slightly.
Turn the hook
Put a drop of oil on the edge, which Schwarz says prevents galling. Run the burnisher along the edge at a slight tilt toward the face, with light pressure, for two or three strokes, then do the same toward the other face. Stop when you can feel a small hook all along the edge.
Take care with the edge
Lie-Nielsen warns to be careful not to cut yourself on the upright scraper. The finished hook is sharp.
The burnisher angle
Published advice differs, and not only in the number. Some sources measure the burnisher’s tilt away from square to the face; Lie-Nielsen describes it the other way round, as the angle to the blade.
What four sources say
- Veritas
- Its variable burnisher sets a tilt of 0° to 15°, and most scraper work falls in the 3° to 10° range.
- Bob Van Dyke (Fine Woodworking)
- Turns the burr at about 3–4°, with two or three light passes.
- Christopher Schwarz (Popular Woodworking)
- Found excellent results at 5°, 10° and 15°, and stresses light pressure and stopping as soon as a burr can be felt.
- Lie-Nielsen
- Starts with the burnisher at 90° to the blade — square across the edge — and decreases the angle with successive passes until a distinct hook forms.
The common ground is more useful than the differences: the tilt is small, the pressure is light, and a few strokes are enough. A larger angle turns a bigger, more aggressive hook; too much pressure makes a hook that is rough and breaks down quickly. A thick scraper blade ground to a 45° bevel, as in cabinet scrapers and scraping planes, is burnished from that bevel instead: Lie-Nielsen starts at about 45° to the blade and works up to 75°.
Using the scraper
- Hold and flex it. Hold the scraper by its ends with your fingers, and press your thumbs into the middle of the back face so it bows slightly away from you. Schwarz flexes it just a bit at the centre; more bow concentrates the cut in a narrower band.
- Tilt it forward. Lean the top of the scraper away from you until the hook bites. Schwarz usually holds it at about 60–65° to the surface. Start more upright and lean it over until it cuts.
- Push, and skew. Push the scraper away from you in short strokes, turning it slightly to the direction of travel so it slices. It can also be pulled, with the hook on the other face.
- Read what comes off. Fine shavings mean the hook is working. Dust means the angle is wrong or the hook has gone: Schwarz advises adjusting the angle first, then checking the hook.
- Keep the surface even. Scrape the whole area, not just one spot, or the surface will dish.
Renewing the hook
A hook lasts minutes, not hours: Van Dyke re-burnishes when the shavings begin to degrade, after perhaps five to ten minutes. Lie-Nielsen says a hook can usually be re-burnished a few times before the edge needs squaring again; when it does, hone the old burr off and start from the file.
When a scraper will not cut
| Symptom | Cause | Fix |
|---|---|---|
| Makes dust, not shavings | Wrong angle, or the hook has worn away | Change the tilt until it cuts; if it still makes dust, re-burnish or re-sharpen |
| Will not cut at any angle | No hook, or a hook turned from a rounded, unfiled edge | Joint, hone and draw the edge again, then turn a fresh hook |
| Chatters | Too little bow, or held too upright | Flex it a little more and lean it further over; take lighter strokes |
| Hook disappears quickly | Too much pressure when turning it, making a rough, weak hook | Turn the hook again with lighter pressure and fewer strokes |
| Digs in or gouges | Too much bow, or too large a hook | Flex it less; turn a smaller hook at a lower angle |
| Leaves tracks or lines | An edge that is not straight, or nicked, or sharp corners digging in | Re-joint the edge straight; flex the scraper so the corners stay clear of the surface |
| Burnisher skips or tears the edge | Galling between burnisher and steel | Clean the burnisher and add a drop of oil |
| Surface dished | Scraping one spot too long | Work across the whole area; use a cabinet scraper on large flat surfaces |
Bench practice. Galling and the oil remedy are from Schwarz; dust as a sign of a worn edge is from both Schwarz and Van Dyke.
After scraping, a light sanding at a fine grit evens the surface if the finish needs it; the grit chart shows where to stop. For surfaces that are still out of flat, go back to the plane — how to use a hand plane covers it.
Sources
The method follows the makers’ instructions and the published methods of Christopher Schwarz and Bob Van Dyke, who disagree on details; where they differ, both are given. The fault table is established bench practice.
- 1.
Christopher Schwarz. A Better Way to Sharpen Scrapers. Popular Woodworking, 2021.
Used for: Filing the edge square with a fine single-cut file, using push strokes, with marker to show progress; honing edge and faces from about 1,000 to 4,000–8,000 grit; burnishing each face flat five or six times; turning the burr with light pressure in two or three strokes, with good results at 5°, 10° and 15°; a drop of oil against galling; holding the scraper flexed slightly at about 60–65° to the surface; dust as a sign to adjust the angle, then check the hook.
- 2.
Bob Van Dyke. Learn a Fast, Reliable Way to Sharpen a Card Scraper. Fine Woodworking, 2019.
Used for: Jointing with a 10 in mill bastard file; lapping the faces and polishing the edge at 90° against a block; drawing out the steel, mushrooming the edge with the burnisher square, then turning the burr at 3–4° with two or three light passes; re-burnishing when shavings degrade; dust as a sign of an edge dulled too far.
- 3.
Hand Scraper Set. Lie-Nielsen Toolworks.
Used for: Holding the scraper upright in a vice; starting with the burnisher at 90° to the blade and decreasing the angle with each pass until a hook can be felt all the way across; taking care with the upright edge; honing off the old burr and squaring the edge before re-burnishing, which can usually be done a few times before re-squaring.
- 4.
Veritas Variable Burnisher. Veritas Tools Inc..
Used for: A guided burnisher settable from 0° to 15°, with most scraper work in the 3° to 10° range, and a polished carbide rod that will not nick the edge.
- 5.
Super-Hard Milled Scrapers. Veritas Tools Inc..
Used for: A milled square edge ready for fine work, used as the reference when filing and stoning a dulled edge back before re-burnishing.
- 6.
Cabinet Maker’s Scraper (No. 85). Lie-Nielsen Toolworks.
Used for: For a 45° bevelled scraper blade: burnishing from about 45° to the blade and working up to 75° until a hook forms.
About this tutorial
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