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Toothy cauls help keep boards aligned in an edge-to-edge glue-up: tighten the cauls against the panel first, then use bar clamps to pull the boards together. Their angled teeth are intended to apply even pressure and discourage boards from riding up as the clamps are tightened.
What toothy cauls do
WOOD Magazine describes this shop-made jig as a way to keep boards from shifting vertically during clamping. Its article says making two or three cauls may help avoid sanding caused by uneven glue-ups, but it reports no measured flatness results or quantified reduction in sanding. The design is attributed to Jeffrey Anderson of Melbourne, Florida, in an article credited to WOOD Magazine Staff and updated March 6, 2025.
Build the cauls
Choose and prepare the stock
Use 1 1/2-by-3-inch stock, with each caul 8 inches longer than the width of the panel you plan to glue. The article suggests softwood such as white pine to help prevent dents. Joint the edges that will contact the workpiece so they are straight.
Cut the teeth and add hardware
Cut 45-degree serrations about 2 inches apart and 1/2 inch deep. Drill vertical holes at the ends and attach carriage-bolt hardware. The published instructions do not specify a full dimensioned drawing or hardware sizes, so select hardware to suit your build rather than assuming a particular bolt or knob dimension.
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#1 Best Overall
SpeTool 24 inch Panel Clamps 2Pack, 4-Way Pressure Steel Parallel Clamp For Board Cabinet, Tabletops, Woodwork, Adjustable parallelogram Couplers, Cutting Board Clamps For Precision Projects
- The 4-Way Panel Clamp：With parallelogram couplers, our 2 pack panel clamps are very convenient to use. It clamps in two directions at once, making it easier to achieve flat panels and flush joints.
- Easy to Use: With parallelogram-action couplers and fix pins, it is easy to adjust the width and thickness you need and continuous apply pressure from all sides. (Tips: Although the operation process is simple, please follow the instructions or video instructions to use it to bring a better experience. )
- Durable Quality: These clamps are made by steel pipe with a durable powder-coat finish and copper thread bushing to ensure that the retaining pins are durable and strong，making it a reliable and precision tool. The special surface treatment allows the glue spilled during the panel splicing process to be easily removed by hand or knife, and is not easy to damage the surface of the panel fixture.
- Versatile Adjustable: Our panel clamps are designed to accommodate panels up to 24'' wide and thicknesses ranging from 1/4" to 3", making it perfect for panel clamp woodworking projects of various sizes and dimensions.
- Ideal Projects: Perfect for medium panel clamp woodworking projects such as cutting boards, table tops, wide door panels, cabinet tops, and thick bench tops. This tool is designed to meet your various needs.
Use the cauls during a glue-up
- Apply glue to the board edges and arrange the boards. Bring the bar clamps into position, but do not tighten them yet.
- Place waxed paper between each caul and the workpiece so squeeze-out does not glue the caul to the panel.
- Tighten the caul knobs to press the boards into alignment.
- Tighten the bar clamps to squeeze the boards together.
What to expect
The design is intended to apply even pressure and discourage boards from riding up when bar-clamp jaws are tightened. The published instructions do not provide comparative testing, a commercial product comparison, or measured sanding savings; treat the cauls as a practical shop aid, not a guarantee of a perfectly flat panel.
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Best Value
SpeTool Panel Clamp, 4-Way Pressure Parallel Clamp For Board Cabinet, Tabletops, Woodwork, Adjustable Parallelogram Couplers, Cutting Board Clamps For Precision Projects, 16 Inch Panel Clamps 2 Pack
- The Mini Panel Clamps：With parallelogram Couplers, this set is very convenient to use. It clamps in two directions at once, making it easier to achieve Flat panels and flush joints.The 4-way pressure system can eliminates gaps and warping in woodworking projects.
- Versatile Adjustable：These panel clamps are designed to accommodate panels up to 16” wide and thicknesses ranging from 1/4" to 2-1/4", making it perfect for panel clamp small woodworking projects of various sizes and dimensions.
- Easy to Use: With parallelogram-action couplers and fix pins, it is easy to adjust the width and thickness you need and continuous apply pressure from all sides.
- Durable Quality: These clamps are made by steel pipe with a durable powder-coat finish and copper thread bushing to ensure that the retaining pins are durable and strong，making it a reliable and precision tool. The special surface treatment allows the glue spilled during the panel splicing process to be easily removed by hand or knife, and is not easy to damage the surface of the panel fixture.
- Ideal for Precision Projects: Perfect for small panel clamp woodworking projects such as cutting boards, table tops, cabinet tops, and small bench . This tool is designed to meet your various needs.
Rank #4
Sale
FASTORS Bar Clamps for Woodworking 36 Inch,4 Pack Wood Clamps Adjustable and Release Quickly,Woodworking Clamps Throat Depth 2.5 Inch,Serrated Steel Rail,Bar Clamps Force 600 Lbs
- 【High quality & Sturdy】The bar clamp body is made of high quality ductile iron material,both sides of bars have precision grooves that can prevent clamp sliding.
- 【Professional Design】The woodworking clamps can be quickly moved and released that can improve work efficiency.
- 【High clamping force】Wood clamps with up to 600 lbs clamp force and have 36" max.opening which can meet your houshold repairs,also is the perfect choice of a professional woodworker.
- 【Comfortable Ergonomic Handle】Woodworking clamps handle are ergonomically designed and comfortable to use without slipping.
- 【Perfect Gift Chioce】Bar clamp set is a great gift for woodworker,family,friends on Father's Day,Christmas,Thanksgiving,Birthday etc.
Rank #3
Rockler Deluxe Parallel Panel Clamps with Scissor Couplers for Panels
- Panel Clamp: Flat panels and flush joints are easy to achieve with our deluxe panel wood working clamps. Each straight clamp tool sandwiches your panel between two rigid steel cauls, forcing the joints flush and ensuring flat results.
- Uniform Pressure: The Rockler adjustable clamp provides 4-way pressure that both squeezes the glue joints together and holds the boards flat while the glue cures. These clamps for woodworking save you loads of sanding time and ensure a level surface without dips and high spots.
- Adjustable Design: These clamps are easily adjusted for stock from 3/4'' to 3” thick and can clamp 10” to 36” wide panels. These thick steel panel clamps with scissor-action couplers are perfect for gluing up table tops, wide door panels and thick bench tops.
- Usage Made Easy: Installing and using the panel clamps for woodworking is a hassle-free procedure. Adjust the clamp to panel thickness, position and squeeze to apply pressure. Align and secure the panels, tighten the clamp, and remove after drying.
- What’s Included: The Rockler Deluxe panel clamp includes (1) set of clamp rails, (1) clamp headstock with handle, (1) clamp tailstock, and (2) clamp feet.
Rank #2
Peachtree Woodworking Supply 2 Pack of 4 Way Pressure Clamps - Clamping Panels From All Four Directions. For Woodworkers, Cabinet and Furniture Makers
- Clamping panels can certainly be a challenge. Especially when we try to use everyday pipe clamps or bar clamps. While these types of clamps work fairly well on certain glue up projects, the one thing they don’t do at all is apply pressure from the top and bottom of the panels during glue up. In fact, with all the pressure being applied on both sides, bar and pipe clamps will almost certainly bow, buckle or rack your panel glue up project.
- Let’s make racked panel glue ups a thing of the past! The uniquely designed 4 way pressure solves this age old issue by applying pressure to all four sides of your panel glue up. With a simple turn of the rotating clamp handle, all four sides of the clamp will draw inward at the same time. This provides equal pressure on to your panel and prevents bowing, buckling, or racked panels.
- Build any length clamp with the durable plastic bars with 4 notches for maximum adjustability to handle a variety of stock widths. Clamp can be used for boards up to 6 inches in thickness by simply adjusting the clamp width capacity with the appropriate number of notches. Turn the handle clockwise to tighten the clamp and turn the handle counter clockwise to release pressure. The 4 way pressure clamp is equipped with side pressure pads to prevent damaging your stock.
- Now you can confidently glue up wide boards, shelving, table tops, and more up to 6” thick. To setup the clamps simply attach the clamp to any length 2 x 2’s (2” x 4” ripped in half) with the the wood screws that are provided, apply wood glue to your project, set the clamps on to your panel boards and turn handle to tighten the clamp on all four sides. We recommend that you place a 4 way pressure clamp every 12” to 18” for best results.
- This clamp package comes with two full 4 way pressure clamp assemblies. Includes: 2 each rotating handle assemblies, 2 each tailstock assemblies, 4 each side pressure pads and 12 each 4 notch bars. Together, this setup will allow you to create two 4 way pressure clamps. More than one clamp is generally recommended for any project over 12” in length. Wood is required for setting up the clamp. Wood is NOT included.
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