How to Calibrate Your Table Saw Miter Slot for Perfect Cuts

Many woodworkers buy an expensive aftermarket miter gauge, only to find their crosscuts are still off. The culprit is almost always a misalignment between the saw blade and the miter slot.

Here is the step-by-step process to fix it.

Step 1: Disconnect the Power

Safety first. Unplug the saw completely.

Step 2: Mark a Tooth

Raise the blade fully. Mark one specific tooth with a marker. You will use this exact same tooth for both front and rear measurements to eliminate errors from a warped blade.

Step 3: Measure the Front

Using a dial indicator (or a combination square if you don’t have one) registered against the miter slot, measure the distance to the marked tooth at the front of the table.

Step 4: Measure the Rear

Rotate the blade by hand so the marked tooth is at the rear. Move your measuring tool to the back and measure again.

Step 5: Adjust the Trunnions

If the measurements differ, you must loosen the bolts holding the trunnions (or the tabletop, depending on your saw type) and gently tap it into alignment. Repeat the measurements until they are identical.

Affiliate Strategy Note: Link to your “High-Precision Miter Gauges: Our Top Picks” post, suggesting that once calibrated, they are ready for a premium gauge.