Riving with Froe and Wedges

Why rive

Riving means splitting wood along its fibers. A saw cuts a straight line whatever the grain does; a split follows the fibers, so they run unbroken from end to end. Riven parts are stronger for their size, bend without breaking, and carve cleanly because there’s no grain running out of the side ¹. Mortise & Tenon Magazine argues no other operation teaches you as much about how wood is built ².

Choosing the log

• Fresh: green wood splits far more easily than seasoned wood.
• Straight and clear: no twist, no knots in the section you need. Read the bark: spiral bark means spiral grain; bumps and scars hide knots.
• Ring-porous hardwoods rive best: oak, ash, and hickory split cleanly and predictably. Birch, maple, and cherry split well enough for spoons and small work. Elm’s interlocked grain resists splitting.
• Cut to length first, a little longer than the finished part.

Opening the log

1. Look at the end for a check or a line through the pith that crosses no knots, and start there.
2. Drive a steel wedge into the end grain with a sledge or maul. As the crack opens down the side, start a second wedge in the crack on the bark side, leapfrogging until the log falls in half. Never strike one steel wedge with another or with an axe poll - steel on steel chips and throws shards.
3. Wooden wedges (gluts) cut from hardwood can follow in a long split.

From log to billet

Keep halving: halves into quarters, quarters into eighths. When a piece splits into two of equal mass, the split runs straight; when one side is much thinner, the split runs out toward it ¹.

For smaller pieces, switch to the froe: an L-shaped blade with a handle at right angles. Set the blade across the end grain, drive it in with a wooden club (never a steel hammer), then lever with the handle to open the split, working the blade down the crack.

From each wedge-shaped piece:

• Split or hew off the pith - it cracks as it dries.
• Split off the sapwood and bark if the part needs to be durable or clean.
• What’s left is a billet: rings running across it, fibers running full length. That’s your spoon blank, chair leg, or bowl blank. For spoons, Sundqvist chooses a blank whose curve or grain suits the shape of the spoon ³.

Steering the split

Splits wander. A riving brake - two poles crossed or a forked limb that grips the piece - holds the work while you lever the froe with one hand and steer with the other.

If the split drifts toward one side, turn the thicker side down and press down on it while levering. Bending the thick side opens the split on that side, so the crack moves back toward the middle ¹. Small corrections early work better than big corrections late.

Store it wet

Riven green wood dries from the ends first and checks. Rive only what you’ll carve soon, keep billets in a plastic bag in a cool place or under wet shavings, and seal the ends of anything you’re storing (see the Wood Drying course on green chair parts and turning blanks).

What to take from this

Riven wood follows the fibers, so it’s stronger and carves cleaner than sawn wood. Choose a fresh, straight, clear log, preferably oak, ash, or hickory, open it with steel wedges, and keep halving so each split has equal mass on both sides. Finish with a froe and club, remove the pith, and steer a wandering split by pressing on the thicker side in a riving brake. Keep riven stock wet until you carve it.