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Rare-earth magnets buried in a hardwood slab. No slots to trap crumbs, no dulling the edges.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Front slab (magnet side) Magnet pockets get bored into the BACK of this piece, leaving ~1/8" of wood over each. | 1 | 1/2" × 3 1/2" × 15" | Black Walnut | ☐ |
| Back slab Glued to the front, hiding the magnets completely. | 1 | 3/4" × 3 1/2" × 15" | Hard Maple | ☐ |
| Base / foot The block leans back ~10° in a dado in the base. Vertical blocks tip forward when a heavy knife lands high. | 1 | 1" × 4 1/2" × 5" | Black Walnut | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| Walnut, 4/4 (Black Walnut) The front face. This is what people see. | 1.5 board feet | ☐ |
| Maple, 4/4 (Hard Maple) The back. The magnets get sandwiched between the two. | 1 board feet | ☐ |
| Neodymium disc magnets, N42, 3/4" x 1/8" N42 or stronger. Weaker magnets will hold a paring knife and drop a chef's knife on your foot. | 10 each | ☐ |
| Epoxy (to seat the magnets) Not wood glue. Wood glue does not bond to a magnet. | 2 oz | ☐ |
| Wood glue | 2 oz | ☐ |
| Food-safe mineral oil | 4 oz | ☐ |
Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Table Saw. Materials: Walnut, 4/4, Maple, 4/4
Walnut front to 1/2", maple back to 3/4". Both flat, both the same width and length.
Any cup here means a visible glue line later.
Tools: Drill Press. Materials: Walnut, 4/4, Neodymium disc magnets, N42, 3/4" x 1/8"
On the drill press, with a depth stop. Bore ten 3/4" flat-bottomed pockets (Forstner bit) into the BACK face of the walnut slab, in two staggered rows.
Set the depth so exactly 1/8" of walnut remains over each magnet. Do the arithmetic: 1/2" slab − 1/8" remaining = 3/8" pocket for a 1/8"-thick magnet, leaving room.
Too deep → weak hold. Too shallow → a visible bump, or worse, a magnet that breaks through when you sand.
Test on a scrap first. Bore one pocket, drop a magnet in, and see if it holds your heaviest knife through the remaining wood.
Materials: Neodymium disc magnets, N42, 3/4" x 1/8"
Before gluing anything: set the magnets in their pockets and make sure they're all oriented the same way — same pole facing out.
Mixed polarity creates weak spots where adjacent fields fight each other. Mark the faces with a Sharpie as you go.
Materials: Neodymium disc magnets, N42, 3/4" x 1/8", Epoxy (to seat the magnets)
A drop of epoxy in each pocket, press the magnet in flush or slightly below the surface.
Epoxy, not wood glue — PVA doesn't bond to neodymium. A magnet that comes loose inside a sealed block cannot be fixed.
Let it cure fully before the next step.
Tools: Parallel Clamps. Materials: Maple, 4/4, Wood glue
Glue the maple back to the walnut front, sandwiching the magnets completely.
Clamp evenly across the whole face — cauls help. Squeeze-out should appear along the whole perimeter. Overnight cure.
Tools: Table Saw
Cut a dado in the base at about 10° off vertical, sized to accept the bottom of the slab.
That lean is not cosmetic: a heavy chef's knife slapping onto a vertical block will tip it forward off the counter. Leaning back, the block's center of gravity stays behind the knives.
Glue the slab into the base.
Tools: Random Orbit Sander, Router. Materials: Food-safe mineral oil
Chamfer or round over all the edges. Sand to 220.
Mineral oil and wax — it lives in a kitchen and knives will scrape it, so use a finish that's food-safe and easy to renew.
Stick your knives to it. The satisfying *clack* is the payoff.