A bookbinding press does one simple job: it holds a book under even pressure while glue dries, folds settle, or a cover is attached. A small home-made press can do this without taking up the space or cost of a large finishing press.
This version consists of two flat boards joined by four threaded rods. Washers spread the load, while nuts or wing nuts let you increase pressure gradually. The important parts are not complicated joinery, but flat boards, accurately placed holes, and a habit of using protective waste boards between the press and the book.
What the press needs to do
The upper and lower boards act as platens. They should remain parallel as the nuts are tightened, with enough room between them for the book and a pair of sacrificial boards. The rods provide the clamping force, and the washers keep the nuts from digging into the wood.
A press made for home use is best suited to small and medium books, folded sections, bookcloth work, and glue-ups. It is not intended to replace a heavy finishing press for large volumes or very high pressure. Gentle, even compression is more useful than brute force: excessive pressure can squeeze out too much adhesive, mark paper, or distort a damp cover.
Materials and tools
Choose two flat boards of equal size. Hardwood is durable, while good-quality plywood is usually easier to find in a flat, stable sheet. Boards around 18–20 mm thick are a practical starting point. A size of roughly 30 by 40 cm gives useful room for many small books, but make the press to suit the largest work you expect to bind.
You will also need:
- Four lengths of threaded rod, long enough to pass through both boards and leave room for washers and nuts. Rods around 8–10 mm in diameter are suitable for a compact press.
- Eight or more large washers, with holes that fit the rods. Use washers above and below the boards if space allows.
- Eight nuts, or four nuts and four wing nuts. Wing nuts are convenient when the press is adjusted often; hex nuts can be tightened with a spanner.
- Cork, felt, or thin rubber for optional pads beneath the boards.
- A drill and a bit matched to the threaded rods.
- A square, pencil, ruler, clamps, and sandpaper.
Before cutting or drilling, check that the boards are flat. A board that rocks on a workbench will not make a reliable platen. Small irregularities can sometimes be corrected with careful sanding, but a visibly bowed board is better replaced.
Plan the layout
Mark the four rod holes near the corners of the boards, leaving enough wood outside each hole to prevent splitting. Keep the holes far enough from the edges that washers will sit fully on the board. The exact margin depends on the board size and washer diameter; a generous, even margin is more important than a particular measurement.
Use the lower board as a template for the upper one. Mark one board first, then clamp the boards together and transfer the marks through both boards if your drill can reach. Alternatively, measure from the same two edges each time. Do not mark each corner independently by eye, since small errors will make the rods lean or bind.
A square is especially useful here. Draw two lines across each board to establish the corner positions, and check that opposite sides are parallel. The rods do not need to be perfectly beautiful, but the boards must meet without twisting.
Prepare the boards
1. Cut and smooth the boards
Cut both boards to the same dimensions, or have them cut accurately. Ease the sharp edges with sandpaper. Round only the corners and edges slightly; the working faces should remain broad and flat.
Remove dust before marking. Pencil lines are easier to read on a clean surface, and dust beneath a washer can contribute to uneven seating.
2. Mark matching holes
Place the boards together with their working faces aligned. Mark the four rod positions on the top board, then transfer them to the lower board. Label corresponding corners if necessary. This avoids accidentally turning one board around and losing the alignment.
If you want the press to accommodate very small books, keep the rods reasonably close to the corners while preserving a sound margin. If the rods are too far inward, the outer edges of the book may receive less pressure. If they are too close to the edge, the board may weaken or split.
3. Drill straight holes
Clamp the boards securely to a stable surface and drill through the marked points. Keep the drill as perpendicular to the board as possible. A drill press makes this easier, but a square held beside the drill can help guide a careful hand-drilled hole.
Drill a small pilot hole first if the boards tend to splinter. Follow with the final bit size. Test one hole with a short piece of rod before drilling all four. The rod should pass through without force, but the fit should not be so loose that the board shifts freely from side to side.
If the upper and lower boards were drilled separately, place them together afterward and pass a rod through each pair of holes. Correct minor tight spots with a round file or a little careful sanding rather than forcing the rod.
Assemble the press
Slide a washer onto each threaded rod, then pass the rods through the lower board. If you want the rods to remain attached to the lower platen, add a nut beneath the board and tighten it lightly. This is optional; a press with loose rods is easier to store flat, while fixed rods make repeated setup quicker.
Place the upper board over the rods. Add a washer above each hole, followed by a wing nut or hex nut. The washers should sit flat against the wood. If the board surface is soft, add washers with a broad outer diameter so the load is distributed over more of the platen.
Do not tighten one corner fully before touching the others. Turn each nut a little at a time in a diagonal sequence: one corner, then the opposite corner, followed by the remaining pair. This helps the upper board descend evenly instead of tilting.
With the press empty, bring the two boards close together and observe their edges. They should remain approximately parallel. If one corner closes first, loosen the nuts and check for a misplaced hole, a washer sitting at an angle, or a rod that is not straight.
Add protective waste boards
Never place a finished book directly between the press platens. Use two clean, flat waste boards or pieces of stiff card on either side of the book. These protect the work from washer marks, glue, dust, and small irregularities in the wooden boards.
For ordinary pressing, the waste boards should be slightly larger than the book but comfortably inside the threaded rods. If they extend beyond the book by a modest amount, they help spread pressure around the edges. Sand their faces smooth and reserve them for clean work.
Cork or felt can be fixed to the inside faces of the wooden platens if desired. Keep the covering thin and firmly attached. A loose or lumpy lining can transfer texture to a cover. Many binders will find removable waste boards more useful, since different jobs call for different surfaces: smooth boards for covers, softer material for delicate work, or a release sheet when glue is present.
Using the press
Place the prepared book between the waste boards. Check that the spine, fore edge, and corners are sitting where you want them before tightening anything. If glue is involved, protect the waste boards with suitable scrap paper or release material, and replace it when it becomes coated.
Tighten the nuts gradually and evenly. Stop when the book is held securely and the boards are bearing evenly against the waste boards. You do not need to crush the stack. If adhesive begins to squeeze out heavily, or if the boards bow, back off and reassess the setup.
During pressing, keep the press on a stable, level surface. Do not place your fingers beneath a descending platen while adjusting the nuts. When the work is ready to remove, loosen each nut in stages rather than releasing one corner completely while the others remain tight.
The correct pressing time depends on the adhesive, paper, board, and surrounding conditions. Follow the adhesive maker’s instructions where available, and allow the work to dry fully before judging the result. A book may feel firm at the surface while moisture remains within the covering or sections.
Useful mistakes to avoid
Drilling holes without a common reference
Four individually measured holes can be close enough to look right but still fail to align. Mark from the same edges, use a template, and test the boards together before final assembly.
Using uneven or damp boards
Wood can move with changes in moisture. Store the press flat and away from direct heat. If a platen develops a noticeable bow, do not compensate by tightening harder; replace or correct the board instead.
Tightening only one side
A tilted platen creates uneven pressure and may leave one edge of the book compressed while another is barely held. Work in small, alternating turns and watch the gap between the boards.
Forgetting the waste boards
Metal washers, rough wood, and stray glue can leave lasting marks. The extra boards are not an inconvenience but part of the press itself.
Making the press larger than necessary
A compact press is easier to align and store. Build for the size of books you actually make, then add a second press or larger platens later if your work changes.
Finishing and keeping it useful
Sand every exposed edge, especially around the rod holes. Remove loose splinters that could catch paper or thread. If you finish the outside of the boards, keep the working faces clean and free of anything that might transfer to a book. A simple wax or oil on the outer wood is optional, but allow any finish to dry completely before use.
Keep the rods clean and lightly brush away glue before it hardens. Store the nuts and washers together, and keep the waste boards flat. From time to time, place the platens together without a book and check that they meet evenly. This simple check will reveal a loose nut, bent rod, or board movement before it affects a binding.
A well-made press is quiet equipment. It does not need complicated adjustments or great force. With flat platens, matching holes, broad washers, and patient tightening, it provides the steady pressure that many bookbinding stages require while remaining small enough for an ordinary workbench.