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Biscuit joint Workbench

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Biscuit joint marked out — the state the viewer opens from: layout lines scribed, no waste removed yet.
Construction
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Parts

Drag to rotate. Right-drag to move. Middle-drag to zoom; wheel zoom needs Rotate on. Double-click to refit.

Tap Rotate, then drag to rotate. Two fingers move or zoom. Double-tap to refit. Turn Rotate off to scroll from the stage.

Parameter controls need the 3D renderer; this device shows the drawn defaults.

Geometry
size #20
19 mm3/4 in
110 mm4 5/16 in
12 mm1/2 in
both slots cut from the same fence setting
Wood tone

Readouts

Glue area
2820 mm²4.37 in²
Parts
3
Cuts
2
Units

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Cut list, finished sizes at the current settings
PartWidthThicknessCutsDeepest cut
Board A110 mm4 5/16 in19 mm3/4 in112 mm1/2 in
Board B110 mm4 5/16 in19 mm3/4 in112 mm1/2 in
BiscuitLength 44 mm1 3/4 inWidth 24 mm15/16 inThickness 5 mm3/16 in0—

Board length along the grain is a display convention in the model and is not listed.

About this joint

A biscuit joint cuts a crescent-shaped slot into each of two mating edges and glues a compressed oval of beech across the line between them. The biscuit swells as it takes up moisture from the glue and fills both slots, holding the faces level while the edge underneath is clamped.

Read the Biscuit joint guide