Why the Leg Vice Earns Its Place

Walk into any working smithy and you will spot one tool that has survived every fashion in workshop design: the leg vice. Sometimes called a blacksmith's vice or a staker, it is bolted to the bench or mounted on its own post, with a long iron leg reaching down to the floor. That leg is not decoration. It transfers the force of your hammering and filing straight into the ground, which is why a leg vice can take a beating that would wreck a modern machinist's vice in a month.

Where a parallel-jaw vice relies on a sliding block and a screw, the leg vice uses a springy, pivot-based action. The rear jaw is fixed; the front jaw swings on a hinge at the bottom, and a large screw pulls it closed. The result is a tool that grips uneven, tapered, and hand-forged work with real conviction, and one you can repair with a file and a bit of patience rather than a replacement order.

Mounting It Properly

Everything about a leg vice depends on how it is fixed down. Get this wrong and you will fight it forever, or worse, crack the mounting lugs.

• Bench-mounted: the vice sits at the edge of a stout bench, with the leg reaching to a solid floor. The bench must be heavy and braced; a flimsy bench will flex and rob you of grip.
• Post-mounted: many smiths mount the vice on its own free-standing post set into the ground or bolted to a concrete pad. This is the traditional arrangement and gives the best shock transfer.
• Height: set the jaws roughly at your elbow height when standing. Too low and you stoop; too high and you lose leverage on the file.
• Fixings: use bolts rather than screws, and check them monthly. Vibration works even the tightest nut loose over time.
• The leg's foot: the bottom of the leg should sit on a plate or a block of hardwood, not directly on a soft floor. That foot carries the load, so give it something solid to press against.

If you are bolting to a bench that also holds your anvil, think again. The two want different kinds of rigidity, and the noise will drive you mad.

Looking After the Jaws

The jaws are the working heart of the vice, and they take constant abuse. Treat them kindly and they will hold a thin hacksaw blade as firmly as a two-inch bar.

Start by understanding the geometry. Because the jaws pivot rather than slide, they close first at the top. That is deliberate: it means a slight downward pressure on the workpiece locks it tight. The drawback is that heavy use of one spot will bell out the faces and leave you with jaws that only grip at the edges.

• Never hammer directly on the jaws. Fit a piece of scrap between the work and the jaws if you are going to strike.
• Keep the screw and the hinge pin lightly oiled. A dry screw will gall and chew itself apart.
• Inspect the jaw faces for roundness. A quick dressing with a smooth file, checking with a straight edge, will bring back a flat face.
• If the jaws are badly worn, some vices have removable jaw plates that can be replaced. Otherwise, a smith can build them up with hard-facing rod and grind them true.
• Use jaw liners, sometimes called soft jaws, for polished or delicate work. Copper or aluminium sheet prevents the jaw teeth from marring the surface.

Techniques That Keep You Safe

A leg vice is safe when you respect three things: leverage, stored energy, and the direction of your force.

Keep your work as low in the jaws as the job allows. Gripping right up at the top of the jaws gives you the widest opening, but it also gives the greatest leverage against the hinge. For heavy twisting, choke the work down towards the bottom of the jaws so the load goes straight into the leg and into the floor.

When you file, push away from you and stand slightly to one side. Never file towards your body or across the jaws at an angle that can slip. A file that jumps out of a cut and into your wrist is the classic leg vice injury, and it happens in a heartbeat.

Cutting with a hacksaw or chisel is the same story. Support the offcut where you can, so it does not drop and drag the blade with it. If you are hot-cutting with a chisel, remember the vice itself will draw heat away from the work; that can be an advantage, but do not let a cold vice shock a very hot piece of steel.

Twisting is where the leg vice shines. Two bars in the jaws, a steady pull, and a length of square stock becomes a decorative twist in seconds. Just remember that a two-foot bar in a leg vice gives you a great deal of multiplying power. Start gently and check your progress, especially on thin stock.

Simple Habits That Reward You

Keep a small brush nearby and clear the swarf and scale out of the screw and hinge at the end of each session. Scale is abrasive and will wear the threads faster than any heavy use.

Do not use the vice as an anvil, an assembly table, or a place to hang your tongs. It is a precision-ish clamping tool built for hard work, and it will repay the respect with decades of service. Handed down carefully, a good leg vice outlives the smith who mounted it, and that is about the finest thing you can say of any tool in the shop.