How to Set a Jointer Fence Square to the Outfeed Table
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A jointer fence should be square to the outfeed table, not merely close to square against the machine’s cast-iron surface. The outfeed table is the reference surface supporting the board after it passes the cutterhead. If the fence leans even slightly, one edge of a board can be jointed at an angle, making accurate panel glue-ups and square casework difficult.
Contents
What You Need
You need a reliable reference square, a clean outfeed table, and a way to adjust the fence without losing the setting. A 6-inch or 12-inch machinist’s square is usually the best choice. A quality combination square also works, provided its blade is straight and the head has no looseness.
For a long fence, a straightedge helps reveal twist or bow that a short square may miss. A feeler gauge set is useful for measuring small gaps, while a machinist square set gives you several sizes for checking different sections of the fence.
| Tool | Best use | Trade-off |
|---|---|---|
| Machinist square | Most accurate routine check | Costs more than a basic combination square |
| Combination square | General shop adjustment | Can develop play or be inaccurate if poorly made |
| Digital angle gauge | Quick confirmation of 90 degrees | Measures the fence angle, but does not always reveal a gap or local bow |
| Feeler gauges | Quantifying small gaps | Slower and unnecessary for a rough initial setup |
A good combination square is fine for most home shops. Spend more on a machinist square if you frequently build cabinets, use wide boards, or have already chased unexplained out-of-square problems.
Prepare the Jointer
Unplug the jointer before making any adjustment. Lower the cutterhead guard if it interferes with access, but do not remove safety equipment unless the machine’s instructions specifically require it. Raise or position the fence so you can reach its locking bolts and adjustment stops.
Brush or vacuum the outfeed table and the bottom of the fence. A shaving trapped under the fence can produce a surprisingly large error. Remove pitch, rust, and hardened finish from the table without rounding its edges. The fence must sit firmly against its adjustment mechanism; it should not rock when you press on either end.
Check that the outfeed table itself is stable and locked. If it moves under hand pressure, correct that problem first. Also inspect the fence for obvious bowing or twist. A fence that is not flat cannot be made square everywhere by adjusting one end.
Check the Fence Against the Outfeed Table
Place the square on the clean outfeed table with the square’s stock firmly against the table. Bring the blade against the fence near the outfeed end. Do not force the blade into the fence; light contact is enough. Look for a gap along the blade.
Check at least three locations: near the outfeed end, near the infeed end, and around the middle. Put the square on both sides of the fence where possible. This separates a simple angle error from a fence that is twisted or bowed.
If the gap is at the top of the blade and is consistent from end to end, the fence is leaning away from the table and needs a basic angle adjustment. If one end is square but the other has a gap, the fence may be twisted, bowed, or incorrectly supported. Do not compensate for a bent fence by forcing one adjustment stop beyond its normal range.
Make the Adjustment
Loosen the fence locking handles or bolts just enough for the fence to move. On many jointers, the fence pivots around a lower rail or hinge. Adjust the fence in small movements, supporting it with one hand so it does not drop or shift abruptly.
When the fence is leaning away from the table at the top, move the top toward the table. When it leans toward the table, move the top away. Tighten the locking hardware gradually, alternating between bolts if there is more than one. Uneven tightening can pull the fence out of square.
Recheck the fence after every adjustment. A practical target is no visible gap with a good square, or a measured error of less than about 0.1 mm over a 100 mm square blade. For general furniture work, that is approximately 0.06 degrees. You do not need laboratory accuracy, but a clearly visible gap will affect a long board.
After reaching square, check the built-in 90-degree stop or adjustment screw. If the fence has a positive stop, adjust the stop until it just contacts the fence at the square setting. The stop should support repeatability, not force the fence into position. Lock the stop and verify the fence again.
Verify With a Test Cut
A square check catches angle errors, but a test cut confirms that the fence remains square under operating pressure. Use a straight, reasonably flat board at least 600 mm long. Joint one face, then joint one edge with the board held firmly against the fence. Keep your hands clear of the cutterhead and follow the machine’s normal feeding procedure.
Check the jointed edge with a square. You can also joint both edges of a narrow test board, mark the faces, and compare them. If the angle changes along the board, inspect the fence for bow, movement, or a loose lock rather than simply turning the adjustment stop.
Another useful test is to joint one edge of a board, flip it end for end while keeping the same face against the fence, and make a very light second pass. If the two cuts do not agree, the fence may not be square or the board may not be staying against it. This test also exposes poor feeding technique.
Common Problems and Limits
A fence can be square to the outfeed table while the jointer still produces a poor edge if the tables are misaligned, the outfeed table is too high or low relative to the knives, or the cutterhead knives are incorrectly installed. If the board develops a snipe-like step at the end, investigate table and knife height rather than changing the fence.
For a fence that is square at one end but not the other, use a long straightedge and feeler gauges to map the error. A gap of 0.5 mm over a 1-meter fence is significant for wide stock. If the fence is permanently bowed, replacement may be cheaper than trying to shim it. A jointer fence replacement part is worth considering when the original casting or extrusion cannot hold an even setting.
Finally, recheck the fence after moving the machine, tightening a previously loose bolt, or making major table adjustments. Mark the correct position of the stop with a fine-tip marker. That small reference saves time the next time the fence is moved for bevel cuts.
