Oak, beech and ash in the joinery workshop

A workbench top in oak, a drawer side in beech and a chair back in ash are three different answers to the same question: what will this piece have to do? Oak brings density and rot resistance, beech brings hardness and tight grain for wear surfaces, and ash brings toughness and bending strength for parts that flex. Pick the species for the job, then pick the joint and the finish to match it.

Why density, hardness and shrinkage decide the species

Density tells you how much wood is in a given volume, and it drives weight, screw holding and how the tool feels on the cut. Hardness tells you how the surface resists dents and wear. Shrinkage tells you how much the board will move as it dries, and movement is what cracks finishes and opens joints.

Numbers from the US Forest Service Wood Handbook put the three species in useful order. At 12 percent moisture content, northern red oak runs about 0.63 specific gravity, American beech about 0.64 and white ash about 0.60. On the Janka scale, red oak sits near 1,290 pounds-force, beech near 1,300 and white ash near 1,320. The differences are small enough that a shop picks between them for other reasons: grain, figure, price and how the wood behaves on the machine.

Shrinkage separates them more clearly. Red oak moves about 8.4 percent tangentially and 4.0 percent radially from green to oven dry. Beech moves about 11.9 percent tangentially and 5.5 percent radially, which is why beech wants careful drying and stable indoor conditions. White ash moves about 7.8 percent tangentially and 4.9 percent radially. A beech drawer front in a damp basement will move more than an oak one in the same room.

For a home workshop, that means oak for frames and outdoor-adjacent work, beech for bench tops, vise jaws, plane bodies and drawer sides that take abrasion, and ash for handles, chair parts and anything that needs to bend without breaking. A magazine on wood, tools and joinery work keeps species sheets on oak, beech and ash that list density, hardness, shrinkage and typical uses side by side, which is a faster way to compare them than three separate books.

Which joint holds: tenons, dovetails or dowels?

A mortise and tenon resists twisting and racking, which is why it carries table aprons, door frames and bed rails. Cut the tenon about one third the thickness of the rail, leave a shoulder to close the joint, and pin it if the load pulls. A haunched tenon fills the groove in a frame and door and keeps the stile from twisting.

A dovetail resists pull in one direction and is the standard for drawer corners and case work. Through dovetails show on both faces and suit solid drawer sides. Half-blind dovetails hide the end grain behind the drawer front. Spacing does not have to be even, but the pins and tails should be laid out from the same gauge line so the joint closes without force.

A dowel joint is faster and weaker in tension, but it is strong enough for face frames, shelf pins and light cabinet work. Dowels need accurate hole spacing more than they need glue volume. A dowel jig or a drill press with a fence gets the holes parallel, and a fluted dowel gives glue somewhere to go.

Glue choice matters as much as the joint. Polyvinyl acetate glues are fine indoors, but they creep under sustained load. A resorcinol or polyurethane glue holds up better where moisture moves in and out. Whatever the joint, dry fit it first. A tenon that needs a mallet to enter will need a chisel to remove.

How do you sharpen a plane iron so it cuts cleanly?

A plane iron is sharp when the back is flat and the bevel meets it at a clean edge. Start by flattening the back on a coarse stone or abrasive sheet until the scratches run the length of the iron, not across it. Then work the bevel at 25 degrees for softwoods and 30 degrees for hardwoods, or add a micro-bevel at 30 degrees on a 25 degree primary bevel.

Work through the grits, and do not skip. A 1,000 grit stone followed by a 4,000 or 8,000 grit stone is a common progression. Keep the iron flat on the stone and use light pressure. A honing guide holds the angle steady, but freehand sharpening is faster once the muscle memory is there.

Remove the burr on the back with a few light passes, then test the edge on end grain. A sharp iron takes a shaving you can read through. A dull one crushes the fibers and leaves a polished, glazed surface that will not take finish evenly.

Set the chip breaker close to the edge, about 1/32 inch, to break shavings before they tear. Set the iron so it takes a light cut, then advance it in small steps. A plane that chatters is usually too deep or has a loose lever cap, not a dull iron.

Oil, wax, varnish or shellac: what finish for what piece?

Oil soaks in and leaves the wood feeling like wood. Linseed oil and tung oil darken the surface slightly and need several coats, with days between them. Oil offers little protection against water rings or abrasion, so it suits tool handles, shop furniture and pieces that will be refinished often.

Wax sits on the surface and gives a soft sheen. Paste wax over oil adds water resistance and makes a tabletop feel smooth. Wax alone needs reapplication and will show wear on a dining table.

Varnish builds a film that resists water, heat and alcohol. It is the finish for a kitchen table or a bar top, but it scratches and is hard to repair in patches. A wiped-on varnish, thinned and applied in many thin coats, looks less like plastic than a brushed-on heavy coat.

Shellac dries fast, sticks to almost anything and is easy to repair. It is the traditional finish for interior doors and furniture, and it is the sealer under many French polish schedules. Shellac is not water resistant, so it belongs indoors and away from standing water.

A common shop sequence is oil to pop the grain, shellac as a sealer, then wax for sheen. Test any schedule on an offcut of the same species, because oak, beech and ash each take stain and finish differently. Oak's open pores drink finish, beech's tight grain blotches, and ash's ring-porous figure shows every coat.

What changes when the wood moves

Every board moves with the seasons, and the joint and finish have to allow it. A tabletop fastened with screws through slotted holes can expand across its width without splitting. A drawer side left slightly proud of its runner can swell in humid weather without binding. A door panel floated in its frame can shrink in winter without opening a gap at the stile.

Design for movement by keeping grain direction consistent within a glue-up, by not gluing a cross-grain joint over a wide surface, and by leaving a small gap where a panel meets a frame. A finish slows moisture exchange but does not stop it. The piece that survives fifty years is the one that was allowed to move.

For a home workshop, the practical order is simple. Choose the species for the load and the wear, cut the joint that resists the force, sharpen the tool until it slices, and finish for the abuse the piece will see. Oak, beech and ash will each do their part if the details around them are right.