A Moxon vise gives a plain workbench a useful second level. Its jaws lift a board closer to the hand, making dovetailing, edge work, and small joinery more comfortable than they are on the bench surface alone. Unlike a permanent vise, it can be lifted away when the bench is needed for another task.
The construction is simple: two hardwood jaws, two wooden screws, and nuts fixed into the rear jaw. The accuracy lies in the preparation. If the jaws are not parallel, or if the screw holes do not agree, the vise will pinch at one end and disappoint at the other.
This version is intended as a sturdy shop fixture rather than a delicate piece of furniture. Use sound, straight-grained hardwood, work patiently, and let the jaws do the holding without excessive force.
Materials and proportions
Choose hardwood for both jaws. Beech, ash, maple, oak, or another stable local hardwood is suitable. Avoid boards with knots near the screw holes, loose grain, or a pronounced cup. The two jaws should be the same length and thickness, though the rear jaw may be made a little wider if you want more room for the nuts.
A practical starting size is:
- jaws around 600–750 mm long;
- 90–120 mm high;
- 25–35 mm thick; and
- screw centres about 100–150 mm in from each end.
These are working proportions, not rules. A shorter vise suits small work and is easier to lift. A longer one gives better support to wide boards but places more demand on the screws and the bench. Keep the screw centres far enough from the ends to leave sound wood around the holes, while allowing a board to be held between them.
You will also need two wooden vise screws with matching nuts, two washers, wood glue, and a few wood screws. The screw diameter and thread pitch determine the drill sizes, so follow the hardware maker’s instructions rather than assuming that a nominal diameter is the correct hole size. Keep sandpaper and paste wax nearby for easing the moving parts and protecting the finished wood.
Photo by Zachary Kadolph on Unsplash.
Prepare the jaws
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Select and acclimatise the boards. Let the hardwood rest in the workshop before machining it. Mark the best face of each board and note the grain direction. If one board has a more attractive or cleaner face, reserve it for the front jaw.
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Flatten one face and one edge. Plane or otherwise prepare a reference face on each jaw blank. Bring the opposite face parallel and make the long edges straight. The jaws do not need cabinetmaking perfection, but both working faces must meet without a hollow or twist.
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Cut both jaws to matching length. Lay the pieces together and mark them from the same reference end. A small difference in length is harmless, but mismatched ends make the vise harder to position and can leave one screw too close to an edge.
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Mark the jaw faces. Identify the inner faces—the faces that will clamp the work—and mark the top edges. These marks prevent the jaws being turned around during drilling or assembly. If the grain rises toward one end, arrange the jaws so that later planing is not forced against a difficult tear-out direction.
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Break the outer edges. Leave the clamping edges crisp and true, but soften the outside corners with a small chamfer or a few strokes of sandpaper. This keeps the vise comfortable to handle and reduces splintering.
Lay out and drill the screw holes
Accurate layout is the most important part of the build. The screw holes in the front and rear jaws must share the same centres. Measure from one common end, mark a centre line across the width of each jaw, and transfer the two screw positions with a square or a marking gauge.
A useful method is to clamp the jaws together with their inner faces touching, align the reference ends, and drill through both pieces in one setup. This keeps the holes registered even if a measurement is slightly imperfect. Use a drill press if available. With a hand drill, make a guide block with a square hole or check the drill from several directions as you work.
The clearance holes through the moving front jaw should allow the wooden screws to pass without binding. The rear jaw receives the nuts, so its holes must suit the nuts and their seating arrangement. Some wooden vise screws use a nut that is fitted into a shallow recess; others are supplied with a nut intended to be retained by a housing. Follow the form of the hardware you have.
Drill from the marked face where possible, and back up the exit side with scrap to prevent breakout. If the hole is deeper than the available drill bit, clear chips often and withdraw the bit rather than forcing it. A hot or clogged bit can wander, especially in dense hardwood.
Fit the nuts and screws
Test-fit each nut in the rear jaw before applying glue. The nuts should sit square to the jaw and remain fully supported by wood. If a nut is housed in a mortise, pare the recess gradually. It should be snug, but do not hammer a metal nut into a tight opening; the surrounding hardwood can split.
Where the nut is held in a simple pocket, orient it so that tightening the screw bears it firmly against the back of the recess. Add a small amount of glue only where it cannot reach the threads. Do not put glue on the screw or inside the threaded passage. Waxing the screw lightly before the final fitting can help prevent accidental adhesion, though the screw should be removed while the nut is being secured whenever practical.
Once the nuts are fixed, run each wooden screw through its nut and check that it turns freely. If a screw feels tight, find the cause before assembly. A hole that is slightly off-axis, a nut that is not seated square, or a rough thread can make the vise feel stiff and can place unnecessary strain on the jaw.
Photo by Jason Leung on Unsplash.
Assemble the moving jaw
Place a washer on each screw between the screw head and the outside face of the front jaw. The washers spread the turning pressure and keep the screw heads from bruising the hardwood. If the supplied screw design uses a different bearing arrangement, retain that arrangement rather than adding parts that interfere with the handle.
Pass both screws through the front jaw and engage them with the nuts in the rear jaw. Turn them evenly until the jaws draw together. At this stage, do not tighten hard. Check that the jaws remain parallel as they close.
If one end closes first, inspect the hole alignment and the seating of the nuts. A small discrepancy can sometimes be corrected by easing a clearance hole in the front jaw, but do this sparingly. The front jaw should move without excessive side play. Enlarging the hole too much makes the jaw rock and reduces the clean, even pressure that makes a twin-screw vise useful.
With the jaws closed, place a straightedge across their top edges and along the inner faces. The top edges need not be perfectly flush if the inner faces meet properly, but any obvious twist should be corrected now. Plane high spots from the clamping faces with the jaws held together, taking light cuts and checking frequently. This is safer than trying to make each jaw perfect in isolation.
Add grip and protect the bench
The inner faces can be left as clean hardwood, or fitted with thin replaceable wooden liners. Liners are helpful when the vise will hold finished work or when the jaws are made from a particularly hard timber. Keep them thin and attach them with glue or small countersunk screws placed well away from the screw paths.
Do not cover the jaws with a soft material that can compress unevenly unless you specifically need that protection. A resilient lining may make the work feel secure, but it can also allow a board to shift under a plane. For general joinery, flat, clean wood gives the most predictable hold.
The underside of the rear jaw is the part most likely to mark the bench. Ease its corners and apply a thin coat of paste wax after the finish has cured. If the vise will be used on a polished or easily damaged surface, add thin sacrificial pads beneath the contact areas. They should be level and firmly attached so the vise does not rock.
A Moxon vise normally rests on the bench by its own weight and by the pressure of the work between the jaws. If your bench is unusually smooth, light, or narrow, consider a simple locating cleat beneath the rear jaw. The cleat can register against the bench edge without permanently fixing the vise in place. Keep any stop low enough that boards can still be slid beneath the jaws.
Finishing and first use
Sand the outside faces through the grades appropriate to your workshop, stopping when the surfaces are smooth but not polished. Leave the clamping faces flat. Remove dust, then apply a modest finish suited to a working tool. Oil, shellac, or a hardwax finish can all be used, provided the finish is kept off the threads and allowed to cure fully.
Wax the wooden screws lightly. Turn them through their full travel several times, brushing away any dust or loose fibres. The motion should be steady rather than loose. If the screw binds, correct the problem instead of compensating with more force.
For the first test, place a square scrap between the jaws and tighten both screws by alternating a few turns at a time. The scrap should be held firmly without being crushed. Test the upper and lower edges with a square, then try a longer board. If the board shifts, look first for dirt, a hollow jaw face, or unequal tightening.
Photo by Sarah Worth on Unsplash.
Useful mistakes to avoid
- Do not drill each jaw from separate layouts. Small measuring errors become visible as uneven closing. Drill the paired holes together whenever possible.
- Do not use green or unstable timber. Movement can misalign the screws and open the joint between the jaws.
- Do not overtighten. Wooden screws provide useful pressure, but they are not meant to substitute for brute force. Tighten until the work is secure, then stop.
- Do not leave the jaws closed for long periods around damp stock. Wood can retain moisture and the pressure may encourage uneven movement.
- Do not ignore grain direction. A split beginning at a screw hole can travel quickly through the jaw. Keep holes in clear, solid wood and inspect the vise occasionally.
A well-made wooden Moxon vise should feel deliberate rather than complicated. Set it on the bench, bring the jaws together evenly, and let the height of the work do its part. With sound timber and accurately registered holes, this removable fixture becomes a quiet extension of an otherwise simple bench.