7 Clever Clamping Tricks for Difficult Woodworking Glueups
Sooner or later, every woodworker encounters an assembly that seems nearly impossible to clamp. Maybe the workpiece is too wide for your clamps, the surfaces are curved, or there's simply no convenient place to apply pressure.
These situations are especially common when building cabinets and furniture. Large panels can flex under clamping pressure, face frames may be difficult to reach, and decorative moldings often lack a flat surface for the clamp jaws.
Fortunately, you don't always need expensive specialty clamps or complicated jigs to solve these problems. A few scraps of wood, some wedges, and a little creative thinking can make even the most awkward glueups manageable.
The seven woodworking clamping techniques below show how to apply pressure exactly where it's needed, using tools and materials you probably already have in your shop.
1. Use a Bowed Clamping Caul to Apply Even Pressure
When gluing up a large cabinet or case assembly, getting consistent pressure across a wide panel can be difficult.
Tightening clamps at the outside edges may pull the ends together while leaving a gap in the middle. The panel can bow slightly, preventing the joint from closing completely.
A bowed clamping caul solves this problem by directing pressure toward the center of the assembly.
How a Bowed Caul Works
Start with a straight, stiff hardwood board and plane a slight convex curve along one edge.
Place the bowed edge against the workpiece, with the highest point of the curve centered over the area that needs pressure.
Position clamps at both ends of the caul and tighten them gradually.
As the caul straightens under pressure, it pushes against the center of the panel, helping close the joint evenly across its width.
This technique is particularly useful for large cabinet sides, wide panels, and case assemblies where ordinary clamps don't provide enough pressure in the middle.
2. Use Spring Sticks to Clamp Inside a Cabinet
Not every glueup requires a conventional clamp. Sometimes a flexible strip of wood can provide all the pressure you need.
This is especially useful when installing spacers, blocking, or small parts inside a cabinet or case.
In these situations, the clamping pressure needs to push outward against the inside surfaces rather than pull two pieces together.
Make a Simple Spring Stick
Cut a thin, flexible strip of wood approximately 1/2" longer than the distance between the opposing surfaces.
Flex the strip slightly and position it between the parts.
As the strip tries to straighten, it applies outward pressure, holding the glued piece in place.
The amount of pressure depends on the thickness, length, and flexibility of the wood.
Spring sticks work well for light- to moderate-duty clamping tasks and can be made in seconds from scrap material.
Use a protective pad if necessary, and make sure the stick is seated securely so it can't slip out under tension.
3. Combine Bar Clamps and Wedges for Edge Gluing
Attaching hardwood edging to plywood panels can be frustrating, especially when the panel is too wide for your available clamps.
Rather than applying clamping pressure directly to the edging, you can use a bar clamp as a support for a pair of wedges.
This arrangement redirects the force toward the glued joint.
How to Clamp Hardwood Edging With Wedges
Position a bar clamp across the faces of the plywood panel, near the edge receiving the hardwood strip.
Tighten the clamp securely so the bar provides a solid backing surface.
Next, insert a pair of opposing wooden wedges between the clamp bar and the hardwood edging.
Drive the wedges together gradually. As they slide against one another, they create pressure against the edging, pushing it firmly against the plywood.
Additional wedge pairs can be positioned along the panel to distribute pressure evenly.
This technique is useful for gluing solid-wood edging to plywood, attaching face frames, and securing long strips where ordinary clamps can't reach.
4. Use a Handscrew Clamp to Create an Extra Clamping Surface
One of the most common challenges during a complicated glueup is finding a place for both jaws of a clamp.
You may have a convenient surface on one end of the assembly but nothing solid for the opposite jaw to grip.
A traditional wooden handscrew clamp can provide the missing anchor point.
Create a Temporary Clamping Anchor
Secure a wooden handscrew over the edge of an intersecting panel.
Position a small wood pad behind the handscrew to bridge the opening between its jaws and create a solid bearing surface.
Now you can position a bar clamp between the handscrew assembly and the part being glued.
The handscrew acts as a temporary clamping surface, allowing pressure to be applied in a direction that would otherwise be difficult.
This trick is particularly useful when assembling cabinets, installing internal dividers, or gluing parts that don't provide convenient opposing surfaces.
5. Extend the Reach of a Clamp With a Cleat and Spacer
Deep-throat clamps are handy for reaching over wide rails or around obstructions. But even these specialty clamps have limitations.
When installing decorative molding or trim on a cabinet, the surrounding parts may prevent the clamp from reaching the glued joint.
A simple wooden cleat and spacer can extend the effective reach of an ordinary clamp.
Transfer Clamping Pressure Around an Obstruction
Position a stiff wooden cleat so one end bears against the part that needs pressure.
Place a spacer beneath the cleat to establish a suitable bearing point.
Then position a clamp over the cleat and tighten it.
The cleat acts as a lever, transferring much of the clamping force to the molding or trim.
This technique is especially useful for attaching moldings below wide face-frame rails or in other locations where the clamp jaws can't reach directly.
Use a cleat stiff enough to resist bending and check that the contact points remain secure as pressure is applied.
6. Use a Notched Cleat and Wedges to Clamp Face Frames
Gluing a face frame to a cabinet can be challenging when the back of the case is already installed.
Without access to the rear of the cabinet, it's difficult to position clamps that pull the face frame tightly against the front edges.
A notched cleat and several wooden wedges provide an effective alternative.
Apply Pressure Without Access to the Back
Start by clamping a notched wooden cleat across the front of the cabinet, aligned with the face-frame member being installed.
The cleat provides a stable surface for the wedges to bear against.
Insert pairs of wedges between the cleat and the face frame.
As the wedges are driven together, they push the frame firmly against the plywood case.
You can position multiple wedge pairs along the length of the frame to distribute pressure where it's needed.
This method is useful for face-frame installation and other cabinet assemblies where conventional clamps can't reach behind the workpiece.
7. Make a Profiled Clamping Caul for Curved Moldings
Decorative moldings and shaped workpieces often present another clamping challenge: There's no flat surface for the clamp jaw to press against.
Applying pressure directly to a rounded or molded profile can cause the clamp to slip or damage the workpiece.
A custom-shaped clamping caul provides a better solution.
Match the Caul to the Workpiece
Start with a scrap of wood and shape one edge to match the profile of the molding.
The shaped surface should fit snugly against the workpiece, distributing pressure across the profile rather than concentrating it at a single point.
Leave the opposite face of the caul flat so the clamp jaw has a stable surface.
Position the caul over the molding and apply clamping pressure as usual.
This technique is particularly useful for attaching bullnose moldings, curved trim, and other decorative parts that are difficult to clamp directly.
A properly fitted caul also helps protect delicate profiles from clamp marks.
Shop Tip: Use Tape to Simplify Clamping
Sometimes the easiest clamping solution doesn't involve a clamp at all.
For small moldings, delicate trim, and lightweight assemblies, masking tape or painter's tape can provide enough temporary holding pressure while the glue sets.
Apply strips of tape across the joint, stretching them slightly as needed to pull the parts together.
Make sure the surfaces are clean and that the tape adheres securely.
This technique is best suited for light-duty glueups where only modest pressure is required.
Make Difficult Woodworking Glueups Easier
A successful glueup isn't always about having more clamps. Often, it's about finding a better way to direct the pressure you already have.
Bowed cauls help distribute pressure across wide panels. Spring sticks provide outward force inside cabinets. Wedges, cleats, and handscrew clamps make it possible to reach awkward joints and create temporary clamping surfaces.
These seven woodworking clamping tricks can save time, reduce frustration, and eliminate the need for expensive specialty equipment.
The next time a project presents an unusual clamping challenge, take a look around your shop. A few scraps of wood and a little ingenuity may be all you need to get the job done.
Handscrew Clamps: One of the Most Versatile Woodworking Clamps
Wooden handscrew clamps can do far more than hold two boards together. Their adjustable jaws make them useful for supporting long workpieces, gripping irregular shapes, and creating clever workholding setups.
Discover More Clever Uses for Handscrew Clamps ➜ Handscrew Clamps: 4 Clever Uses for Woodworking
