How to Choose a Jointer Fence Height for Edge Jointing
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Contents
What fence height does
A jointer fence supports the workpiece as you guide an edge across the cutterhead. For edge jointing, the fence needs to contact enough of the board to keep it upright and prevent it from tipping, without getting in the way of your hands or the cut. The right setting depends more on the board’s width and stability than on a single ideal measurement.
For common stock around 3/4 to 1-1/2 inches thick, set the fence so its lower edge is close to the table—typically within 1/8 inch. This gives the board a continuous guide near the cutting area and helps keep thin stock from slipping beneath the fence. If your jointer has a fixed-height fence, check that it sits close to the table and doesn’t leave a gap that can catch an edge.
Set the height for the stock
For a narrow board, the fence should support the board’s full height, or as much of it as your machine allows. A short fence that contacts only the middle of a tall board gives less leverage against tipping. On a board 4 inches wide, for example, a fence that supports nearly all 4 inches is easier to use accurately than one that supports only 2 inches.
On tall stock, don’t assume that raising the fence is automatically safer or more accurate. A high, narrow board can still tip if it is bowed, twisted, or held with uneven pressure. Keep the board flat against the fence and table, and take light cuts. If the board is too tall to control securely, use a suitable auxiliary support or choose another method rather than forcing it through.
Before starting, unplug the jointer and check fence alignment and table condition. The fence should be square to the table for a straight 90-degree edge; verify it with a reliable square. Also check that the fence face is flat and that the board can sit against it without rocking.
Fence height and support options
| Setup | Best suited to | Trade-off |
|---|---|---|
| Standard fence at its normal height | Everyday edge jointing of stable boards | Simple and quick, but may provide limited support for unusually tall stock |
| Adjustable-height fence | Shops that regularly joint different stock widths or use the jointer for other cuts | More flexibility, but it must be reset and checked carefully |
| Auxiliary fence or tall support | Occasional work with taller boards that need more lateral guidance | Can improve support, but adds setup time and must be secured clear of the cutterhead |
If you’re choosing a machine, prioritize a rigid fence that locks without shifting and stays square over a fence that merely looks tall. A benchtop jointer can be adequate for short, narrow boards and limited shop space, but its shorter tables and lighter fence make long or wide stock harder to control. For frequent work on long boards, table length and fence rigidity matter at least as much as fence height.
When to add support
An adjustable fence is useful if you often change between narrow trim and taller stock, or if you need an angled setting for a task the machine supports. It is not a substitute for a stable board or sound technique. Each adjustment creates another opportunity for the fence to be out of square or to shift during the cut, so lock it firmly and recheck it.
A shop-made auxiliary fence can extend the support surface for occasional tall work. Use straight, stable material, fasten it securely to the factory fence, and confirm that it cannot interfere with the guard, cutterhead, or workpiece path. Do not attach a loose board with clamps positioned where the stock or your hands will hit them. If the added fence flexes when pushed, it is not providing dependable support.
For a regular need, a purpose-built jointer tall fence may be more convenient than repeatedly building temporary extensions. Buy one only if it fits your machine and can be mounted rigidly; a tall but wobbly guide can make the cut less predictable.
Avoid common failures
A gap between the fence and table can let a thin edge catch or deflect. A fence that is not square produces an edge that may look clean but will not meet its mating board evenly. And a tall board with a cupped edge can rock against the fence, leading to a tapered or uneven cut. Check the board for twist and bow first, and mark the face that will ride against the fence.
Use push blocks or other suitable hold-downs to keep pressure on the workpiece, following your machine’s instructions. Keep hands away from the cutterhead opening, and never joint stock shorter than the machine’s stated minimum. Make shallow passes—often about 1/32 inch for finishing, and no more than 1/16 inch for a normal pass unless the manufacturer allows otherwise. Deep cuts increase the chance of tear-out, kickback, and loss of control.
For buying a replacement or upgrade, compare fence travel, locking strength, flatness, and compatibility before paying extra for height alone. A basic fixed fence is fine for most ordinary edge jointing if it is square, rigid, and tall enough to support the stock you actually use. If your work regularly exceeds that support, an adjustable or auxiliary fence is worthwhile—but only when it stays solidly aligned.
