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A table saw fence must run parallel to the blade, or the saw becomes harder to control and less accurate. A fence that points toward the blade at the rear can pinch the workpiece, cause burning, and increase kickback risk. A fence that opens too far at the rear is usually safer, but it can make ripping dimensions inconsistent and leave a tapered cut.
Alignment is not a one-time adjustment. Fence rails can shift, locking mechanisms can wear, and a saw moved around a shop may need checking again. The procedure below works for most contractor, jobsite, and cabinet-style table saws.
Tools and safety before you start
Unplug the saw before measuring or adjusting anything. Remove the blade guard if it blocks access, but reinstall it before cutting. Keep your hands away from the blade even when the saw is unplugged; treat the blade as sharp and hazardous during every step.
You will need a reliable tape measure or steel rule, a combination square, a pencil, and the wrenches or hex keys supplied with the saw. A dial indicator with a magnetic or table-saw-specific base gives more precise results, but it is not necessary for ordinary woodworking. A straight, known-flat board at least 24 inches long is useful for checking the fence face.
Before adjusting the fence, check the blade itself. Make sure it is fully seated, the arbor nut is tight, and the blade is not visibly warped. A bent blade or dirty arbor flange can make a properly aligned fence appear faulty.
Check the blade and miter slot first
Raise the blade about 1 inch above the table. Choose one tooth and mark it with a pencil. Rotate the blade so the marked tooth is just above the table at the front of the blade. Measure from the tooth to the nearest edge of the miter slot. Use the same marked tooth and rotate it to the rear of the table, then measure again.
The two measurements should be equal or nearly equal. A difference of about 1/64 inch is acceptable for many jobsite saws. If the difference is closer to 1/16 inch or more, align the blade to the miter slot before adjusting the fence. Otherwise, you may align the fence to a crooked reference and still get poor cuts.
To align the blade, loosen the trunnion or table-mounting bolts according to the saw’s manual, tap the assembly slightly, and repeat the front and rear measurements. Tighten the bolts gradually while checking that the measurement does not change. On some portable saws, the table or blade assembly moves as one unit; on others, the table stays fixed and the trunnions move.
Measure the fence parallel to the blade
Lock the fence in place several inches from the blade. Do not measure from the blade teeth unless you can account for tooth set. Instead, use the miter slot as the reference after confirming the blade is parallel to it.
Measure from the fence face to the same edge of the miter slot at the front and rear. Take the measurements at least 2 inches away from the blade. If the rear measurement is slightly larger, the fence is “opened” at the back. That is generally preferable to having the rear closer to the blade, because it reduces the chance of the workpiece being trapped between the blade and fence.
| Rear-fence condition | Typical result | What to do |
|---|---|---|
| Rear is 0 to 1/64 inch wider | Accurate and generally safe | Leave it alone unless cuts show a problem |
| Rear is 1/32 inch wider | Usually usable, but may affect precision ripping | Adjust if you need consistent cabinet or furniture parts |
| Rear is closer than the front | Higher chance of binding, burning, and kickback | Correct before using the saw |
| Difference changes along the fence | Fence face may be bowed or twisted | Inspect or replace the fence before fine adjustment |
Adjust the fence
Most fences use one of three adjustment systems: bolts at the fence head, adjustable guide pads or screws, or a clamp that must be repositioned on the rail. Start with the saw’s manual if available. Make small changes—about 1/64 to 1/32 inch at a time—and remeasure after every change.
For a fence with bolts at the head, unlock the fence and loosen the bolts just enough that the fence can move. Set the fence against a straight reference or use the miter-slot measurements to position it. Tighten the bolts evenly, alternating between them so the fence does not twist while clamping.
For a rack-and-pinion or jobsite fence, adjust the fence head or rear guide pads rather than forcing the tube. The fence should lock firmly without excessive handle pressure. If the front locks but the rear can be pushed sideways by hand, inspect the guide pads, rail, and locking mechanism. A fence that cannot hold its position is not fixed by parallel alignment alone.
If the fence is straight but the rear is too close to the blade, a thin shim under the rear portion of the fence face can sometimes create a small relief. This is a practical workaround, not a substitute for repairing a loose or damaged fence. Use a durable, flat shim and ensure it cannot come loose into the blade path.
Verify with a test cut
Lock the fence and measure its position at the front and rear again. Then make a test cut in straight, flat scrap lumber about 3/4 inch thick. Measure the width at both ends with calipers or a reliable rule. A difference of 1/64 inch over an 18-inch cut is good for most general work. If the cut tapers more than that, recheck the fence, blade alignment, and whether the stock is actually straight.
Look for burn marks, resistance near the rear of the blade, or a cut edge that is rougher on one end. These signs can indicate a fence closing toward the blade, a dull or misaligned blade, or pressure from the operator steering the board into the fence. Feed the board steadily and keep it firmly against the fence without forcing it sideways.
When adjustment is not enough
A basic factory fence is fine when it locks reliably, stays parallel, and produces the accuracy your projects require. There is no need to replace it simply because a heavier fence exists. A replacement becomes worthwhile when the original flexes under hand pressure, shifts after locking, has a permanently bowed face, or is difficult to align repeatedly.
For a portable saw, compare table saw replacement fences with the saw’s rail length and mounting pattern. A heavy aftermarket fence may improve rigidity, but it can overload a lightweight rail or reduce portability. For cabinet saws, a T-square table saw fence is usually the better choice when repeatable, full-length locking matters.
After alignment, mark the fence’s normal position or record the front and rear measurements. Recheck it after transporting the saw, changing the blade, or noticing burning and inconsistent widths. That short inspection prevents a small alignment error from becoming a safety problem.