Carving Roman Acanthus 16

The number stamped on a carving gouge is its sweep, which means how curved the steel is across the edge. One is flat. By nine you are close to a half circle. Past nine the shape stops being an arc and becomes a U, and the tool stops being a gouge.

Bought a set and found the numbers told you nothing? Read a tool list marked number 7 at four millimetres and had to guess what arrived? The system is older than any of us and it takes about two minutes to learn, and this is the workshop where I finally sat down and drew it out.

Key takeaways

• Curvature is what sweep means. The number is the sweep, nothing else.
• Number 1 runs dead flat, the only tool in the rack that is really a chisel.
• Gouges run to 9, sometimes 10. Veiners begin at 11.
• V tools live from 12 to 16, and 17 is its own animal.
• Britain and Europe disagree about number 2. Both are right.
• Never press an edge straight down. The fibres come back tomorrow.

What do the numbers on a carving gouge mean?

Curvature, and a professional word for it exists. Sweep is the term, and once you have it the whole rack reads like a sentence instead of a pile of steel.

Start at one. Number 1 is dead flat, and in truth it is the only chisel in the whole set. People call everything on the bench a chisel and the word does not fit most of it.

Two is where the world splits. Order a number 2 in Britain and a skew chisel arrives, still nearly flat, ground on the skew. Order the same number in Germany or Switzerland and you get a gouge with a slight radius already in it.

From there up to nine they are all gouges, and a few makers go to ten. At nine the arc is near enough a true half round. Lay one on a board, roll it through, and the hollow it leaves is a perfect circle.

Eleven begins the veiners. Same half round idea, except the walls run straight up from it, so the profile is a U rather than an arc. Twelve through about sixteen are V tools, sold at sixty, forty five and thirty five degrees, and the thirty five is my favourite of the three.

Then 17, which confuses everybody. Think of a V tool as two chisels meeting, except the corner where they meet is never sharp. A small gouge sits in that corner. On a 17 that bottom gouge is simply bigger.

What it says	What that number actually describes about the steel itself	Where the name changes	What I reach for it to do on a Roman acanthus leaf
Number one	Dead flat, and the only true chisel	Chisel everywhere in the world	Cleaning pencil off, and squaring the little step at the end
Two and three	Almost flat, a radius you can just see	A skew chisel in Britain, already a gouge at two in Germany and Switzerland	Shaving the ground flat
Anything from four through nine, and ten at some makers	All gouges	Roughly half a round once you reach nine	Hollowing, lowering and rolling a bead round, which is most of this leaf
Eleven and up	A U rather than an arc, called a veiner	Veiner, and never a gouge	Undercutting a lip, and half a millimetre of shade nobody can account for
Twelve on	V tools at sixty, forty five or thirty five	Seventeen is its own	Two chisels and a small gouge along the bottom of it

Why should you never press a chisel straight down?

Wood fibres have memory. Push an edge into the surface and you are not severing them, you are crushing them sideways, and the cut looks perfect while you stand there admiring it.

Come back tomorrow and those fibres have lifted. What was a crisp line is now a rough furry edge, and there is nothing to be done about it except carve the whole thing lower.

A relief cut is the answer and it costs one extra pass. Before any shaping, run a light cut along both sides of the line to free the fibre, roughly a millimetre and a half deep, with a number 8 at an eighth. Any V tool will free it just as well.

Slice, always. Size makes no difference to this rule, and a three inch tool gets moved sideways through the cut exactly like a one millimetre one. Pushing straight is what beginners do and the surface tells on them.

Never carve in the air either. My free hand always rests on the board, the tool rests against that hand, and the two together give me a pivot I can feel. Air carving is the commonest fault I see and it has no upside.

How do you carve a fingernail into an acanthus?

Shallow. Shallower than feels worth doing. Each one drops a sixteenth of an inch, no deeper, and the whole middle section of this leaf is built from them.

Relief cut first, then a number 6 at fourteen millimetres stood upright on the line. Rotate the panel, come back with the same tool, and meet the first cut so the chip lifts out clean.

Chip refusing to fly means one thing only. Your first cut is not deep enough, so go back and take it deeper rather than levering at the wood, which is how edges break. A zipper cut frees a stubborn one.

What it should look like from the side is a row of long shallow concaves, something like the ribs inside a vault. Roman carvers were good and they were never perfect, so do not chase perfect here.

How do you take a carved background flat?

Big tool first, small tool after, and the order saves an hour. Reach for a 9 and the bulk goes fast. Then a 3 at twenty millimetres shaves the facets the 9 left behind.

Plenty of carvers stop before that and leave the ground rough, and it looks perfectly good. Ashley Iles even sell a grounding tool made only for flattening it, around a number 3 sweep, and I have a two and a half as well.

Size is speed, and here is how I explain it to students. I live in Florida. Flying to Chicago takes three hours, driving takes twenty four, walking takes days. A big gouge is the plane.

A wide tool also gives you every narrow tool inside it. Use one corner and it behaves like something small. Use the whole edge and it clears a palm of wood in a stroke. My bench carries two Veritas carver vices so I can turn the work to meet it.

Which tool leaves the cleanest undercut?

Number 17, in my hands. A plain V tool leaves a hard internal corner where its two walls meet, and that corner reads hard under light. The rounder bottom of a 17 softens it.

Laid on one of its flat sides, it clears the junk from the angle between leaf and ground and leaves a surface you would not think came off a hand tool. Deep undercutting is a preference of mine, and I go further than most.

Historical pieces often skip it, and the reason is money rather than taste. Undercutting deeply takes hours nobody was paying for. Every carver alive has felt that pull, myself included when a client is waiting.

Romans had no V tool at all, which surprises people. It is a later invention, and whole carving traditions still work without one. They used a gouge, and a number 11 laid on its side still does that job today.

A smooth transition there mattered even more once gilding arrived. Walk into a Greek or Russian Orthodox church and the acanthus is everywhere, and all of it is gilded.

Gold never went straight onto bare wood. Red clay went on first, worked into every hollow with a finger, and gold leaf over that. Today we use gesso. Any hard corner down there would have shown through either one.

What does a chamfer do for a carved leaf?

It manufactures a light line. Every edge on this panel gets a sixteenth knocked off and bevelled over, and that tiny new face turns toward the lamp and goes bright.

Draw a section through the leaf and you can see why. There is a concave, then the edge, then the undercut running away underneath. Left sharp, that edge is a line. Bevelled, it is a surface, and a surface can catch light.

Shadow sits in the hollow, light rides the chamfer, and the leaf reads with an extra dimension it did not have five minutes earlier. Painters do the same thing with a stroke of white.

Turn a lamp off and you see it immediately. Light and shade are most of what carving is, and this is the cheapest dimension you will ever buy. Furniture carvers use it to make low relief read deep.

Any sharp knife does it. Mine is an Ashley Iles from the Peter Benson collection, and I ground the heel of it away so the back of the blade works too. Failing that, a number 1 double bevel works, and so would sandpaper if you prefer, though I would rather not.

At the tip of the leaf the same logic makes a step, about a sixteenth deep and near enough square. Look at a Roman ogee moulding and it is already there: hollow above, round below, and a small flat shoulder held between the two.

Number 23 cuts that shoulder by itself, since it carries a wall and a floor and gives ninety degrees without thinking. Mine is four millimetres. A small number 1 or a knife gets there as well.

Can a broken carving be saved?

Glue it, and say so. I broke this leaf twice on camera during these six sessions, and it is on the recording because cutting it out would teach nobody anything.

Use as little glue as the joint will take. My trick is a toothpick, because squeezing glue from the bottle floods the break and squeeze out on a finished surface is worse than the crack was.

Ordinary yellow glue, clamped by nothing but a finger, dry overnight, and by morning nobody finds it. Better not to break it, obviously. Sometimes it happens anyway, and it happens to me.

Most breaks trace back to a dull edge and too much force. Watch the buffing wheel and the felt turns black, which means steel is coming off. That is sharpening, whatever the compound tin says.

A Roman tip should be rounder than a Greek one, incidentally. Greek and later acanthus end in a point. This family softens, keeps a hint of a point, and rounds inward, and I took the corner off mine with a mallet once I saw it looking too sharp.

When is a carved panel finished?

Never, strictly, and that is not a dodge. Every pass reveals another place that would look better with one more cut, and the piece asymptotes toward done without arriving.

Ninety nine point nine per cent is what I called it out loud on the last session. The work stops when the remaining improvements cost more than they return, not when the leaf runs out of things to fix.

Some tool marks stay on purpose. A really sharp edge leaves a surface like a mirror, and among that shine there are micro facets where one pass met the next. Those are brush marks. I want them visible.

Dark patches at this stage are not dirty hands. Skin oil reacts with the wood and oxidises, a patina forming early, and washing changes nothing. Painter gloves solve it if the marks bother you.

The last thing added here was beading, three round beads across a quarter inch on each volute, laid out with a knife and rolled over with a number 7. Beads are among the oldest architectural ornaments there are.

A fishtail is worth owning for exactly this, since the narrowed shank lets one corner of the edge reach into a bead without the rest of the tool fouling the next one along.

Then it was done, after sixteen workshops. Few carvers work in this Roman style now, which is part of why I teach it. A leaf like this belongs over a range hood, on a kitchen corbel or a mantel, and it starts from one sheet of paper.

Would you rather watch the sweep numbers drawn out on paper and then used, one tool at a time, on a real leaf? Shall we carve?

This workshop closes the Roman acanthus series, and tuition opens all sixteen of them. Workshop fifteen carved the U shaped shade this one refines, workshop thirteen set the sizes, and the tools course goes through a rack properly. Sharpening decides whether any of it works, the Greek leaf is the plainer parent of this one, and design principles sit under all of it. Want me beside you? We teach in person, and a beginner starts here.