How to Cut Consistent Tenons on a Table Saw with a Jig
What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
A table saw can cut accurate tenons without a dedicated tenoning jig, but the workpiece needs support and a repeatable way to set the shoulders and cheeks. A crosscut sled with a tall fence is enough for many small parts; a purpose-built jig is easier to adjust for repeated cuts or larger stock.
Contents
What you need
Use a sharp blade suited to the cut, a reliable square, a push block or clamp, and a jig that holds the work securely. A standard combination blade can work, though a flat-top grind blade leaves a flatter shoulder than many alternate-top-bevel blades. If you cut tenons often, a table saw tenoning jig can hold a board vertically against the saw fence. For occasional work, a stable crosscut sled with a sacrificial fence is often the cheaper, perfectly adequate choice.
Do not remove the blade guard and riving knife unless the cut requires it, and reinstall them afterward. Tenon cheeks are usually cut with the stock held vertically, a position where a loose or tipping workpiece can be pulled into the blade. Keep hands clear of the blade path; use the jig’s clamp or a suitable hold-down rather than relying on grip alone.
Choose a jig for the cut
| Setup | Best for | Trade-off |
|---|---|---|
| Crosscut sled and tall sacrificial fence | Short stock, occasional tenons, shoulder cuts | Simple and inexpensive, but cheek cuts need a secure vertical hold-down or another setup |
| Vertical tenoning jig | Repeated cheek cuts and taller workpieces | More control and adjustment, but costs more and must fit your saw’s fence or miter slot |
| Shop-made vertical carrier | One-off projects or a custom stock size | Low material cost, but accuracy and safety depend on careful construction |
For a dedicated jig, check how it attaches before buying. Some ride against the rip fence; others register in a miter slot. Confirm compatibility with your saw, available table space, workpiece height, and the jig’s clamping range. A table saw crosscut sled is a sensible purchase if you also need repeatable crosscuts, not just tenons.
Size and mark the tenon
Start with a square, flat workpiece. Measure the mortise, then make the tenon slightly oversize in thickness and width. Sneak up on a fit with test cuts rather than aiming for a friction fit immediately. For a joint in hardwood, a tenon roughly one-third the stock thickness is a common starting point, but mortise size, grain direction, and the joint’s load matter more than a fixed rule.
Mark the shoulder line around all four faces with a marking knife or sharp pencil and a square. Set the tenon length from the shoulder to the end of the stock; account for any bevel or chamfer at the tip. Mark the cheek boundaries clearly. If the tenon is centered, measure from both faces instead of assuming the board’s thickness is uniform.
Cut the shoulders first
Set the blade height to the tenon length: the exposed tooth height should reach from the shoulder line to the end of the tenon. Use a stop block on the sled fence if you have multiple pieces, but keep it positioned so the work cannot bind between the stop and blade. Make a test cut on scrap of the same thickness, then check the shoulder against your layout line.
With the work flat on the sled, cut the shoulder across the end, then rotate the piece to cut the shoulder lines on the other faces. Support the stock against the fence and keep the end square to the blade. A shoulder cut that stops short can be pared to the line; one that passes the line shortens the tenon and is harder to repair.
Cut the cheeks in controlled passes
For cheek cuts, stand the stock on edge or end in a vertical jig, with the shoulder line registered to the blade. Set the blade height to the full tenon length. Adjust the fence or jig so the first pass removes only a small amount from the cheek. Clamp the work, make the cut, and measure the remaining tenon thickness with calipers or a reliable rule.
Raise the blade or shift the jig in small increments to remove the remaining waste. Take matching passes on opposite faces to keep the tenon centered. The exact adjustment depends on the jig and blade kerf; a 1/32-inch change can be enough to turn a snug fit into a loose one. Cut the outside cheeks first, then clear the waste between them with additional passes. Avoid forcing a narrow offcut between the blade and fence.
If you are using a shop-made carrier, make sure its base is flat and its vertical fence is square to the table. Add a clamp and a handle that keeps your hands away from the blade. A carrier that rocks or flexes can make the cheek tapered and may let the work tip toward the blade.
Test the fit and correct common problems
Test the tenon in the actual mortise, or in a scrap mortise cut with the same setup. It should enter with firm hand pressure and seat without hammering. If it binds, identify whether the cheeks, shoulders, or edges are responsible before removing more material. A few light strokes with a shoulder plane, chisel, or sanding block can tune a nearly finished joint; do not use sanding to disguise a large error.
A tapered cheek usually points to a workpiece that was not held square or a jig that deflected. Recheck the jig’s vertical fence with a square and clamp the stock more firmly. Unequal cheeks often come from measuring from only one face or failing to alternate cuts. Ragged shoulders can result from a dull blade, excessive feed pressure, or unsupported fibers; use a sharp blade and a sacrificial fence. If the fit is loose, stop cutting and adjust the next tenon rather than trying to build up the first with glue and filler.
