Time Required: 5-10 minutes
Difficulty: Easy
Tools Needed: Blade wrench (included with saw), possibly a second wrench for the arbor lock
When to Change Your Table Saw Blade
Change your blade when you notice any of these signs: Burn marks on the wood. If the blade is leaving scorch marks on the cut face, the teeth are dull. A sharp blade cuts cleanly without generating excessive heat. You have to push harder. If the workpiece resists feeding more than usual, the blade is dull. Forcing material through a dull blade is a kickback risk. Rough or ragged cuts. Tearout on the bottom face of plywood or fuzzy edges on hardwood rip cuts indicate dull or damaged teeth. Chipped or missing teeth. Inspect the blade periodically. A single chipped carbide tooth is enough reason to replace or resharpen the blade. Missing teeth cause vibration that damages the arbor bearings. Switching cut types. Changing from ripping to crosscutting or from construction lumber to plywood? Different blade geometries perform better for different tasks. Swapping blades is faster than fighting the wrong blade.Step-by-Step: Changing the Blade
Step 1: Disconnect Power
This is not optional. Unplug the saw from the wall outlet. If your saw has a magnetic safety switch, turn it off AND unplug it. If you have a SawStop, power it down and unplug. Do not rely on the switch alone — plugs can be bumped, and some saws have capacitors that retain charge. For cordless jobsite saws, remove the battery.Step 2: Remove the Throat Plate
Lift the throat plate (also called the table insert) out of the table. Most throat plates have a set screw or spring tab at one end — press or unscrew it and lift the plate straight up. This gives you access to the blade and arbor.Step 3: Raise the Blade to Full Height
Crank the blade height adjustment to raise the blade as high as it goes. This gives you maximum access to the arbor nut and makes the wrench work easier. It also moves the blade away from the underside of the table where your knuckles will be.Step 4: Identify the Arbor Nut Direction
This is where people get confused. Most table saw arbor nuts are reverse-threaded. The nut tightens in the opposite direction of the blade's rotation, which is a safety design — the spinning blade's inertia tightens the nut during use instead of loosening it. On most saws, the blade spins toward you (when viewed from the front of the saw). That means:- To loosen the arbor nut: Turn it CLOCKWISE (to the right)
- To tighten the arbor nut: Turn it COUNTER-CLOCKWISE (to the left)
Step 5: Lock the Blade
You need to prevent the blade from spinning while you loosen the nut. Most saws have one of these mechanisms:- Arbor lock button. Press the button on the saw's trunnion assembly while turning the wrench. This is the easiest method. Many newer DeWalt, Ridgid, and SawStop saws have this.
- Two-wrench method. Use the blade wrench on the arbor nut and a second wrench on the arbor shaft flat. Apply opposing force. This is common on contractor saws and older cabinet saws.
- Wedge method. Press a piece of scrap wood against the teeth to prevent rotation. Use softwood — hardwood can chip carbide teeth.
Step 6: Remove the Arbor Nut and Washer
With the blade locked, use the wrench to loosen the arbor nut. Remove the nut and the outer blade washer (flange). Keep them together — the washer goes back on in the same orientation.Step 7: Remove the Old Blade
Slide the blade off the arbor shaft. Be careful — even a dull blade has sharp carbide teeth. Handle it by the body of the blade, not the teeth. Set it aside on a flat surface or in a blade case.Step 8: Clean the Arbor and Flanges
Use a rag to wipe sawdust, pitch, and debris off the arbor shaft, the inner flange (the one attached to the saw), and the outer washer. Built-up residue on the flanges prevents the blade from sitting flat, which causes wobble and vibration. If there is pitch buildup, use a blade cleaner spray or mineral spirits.Step 9: Install the New Blade
Slide the new blade onto the arbor shaft. Make sure the teeth point toward you (toward the front of the saw). The teeth should face the direction of rotation — down and toward the operator at the front. Most blades have an arrow printed on them showing the correct rotation direction. Replace the outer washer (flat side against the blade) and thread the arbor nut on by hand. Snug it up with your fingers first to ensure the threads are not cross-threaded.Step 10: Tighten the Arbor Nut
Lock the blade again using the same method from Step 5. Use the wrench to tighten the arbor nut. Remember: tighten counter-clockwise (on reverse-threaded arbors). Tighten firmly but do not over-torque. The spinning blade will self-tighten during use. Over-tightening makes the next blade change unnecessarily difficult and can deform the washer.Step 11: Check Alignment
Before replacing the throat plate, do a quick alignment check. Lower the blade so one tooth is at the highest point. Place a combination square or a small ruler against the miter slot and measure the distance to a tooth at the front of the blade. Rotate the blade 180 degrees (by hand) and measure the same tooth at the rear. The measurements should be within 0.003 inches. If they are significantly different, the blade is not seated flat on the flanges — remove it and check for debris.Step 12: Replace the Throat Plate and Reconnect Power
Drop the throat plate back in, plug the saw in, and make a test cut on scrap material. Listen for vibration or wobble. A properly installed blade runs smoothly with a clean, consistent cut sound.Common Blade Types
| Blade Type | Tooth Count | Best For | Kerf |
|---|---|---|---|
| Ripping | 24 | Ripping solid wood with the grain | Full (1/8") |
| Crosscutting | 60-80 | Crosscuts, miter cuts, trim | Full or thin |
| Combination | 40-50 | General purpose — ripping and crosscutting | Full |
| Plywood / Melamine | 80 | Sheet goods with minimal tearout | Thin (3/32") |
| Dado stack | Varies | Dadoes, rabbets, grooves | Adjustable |
Should You Sharpen or Replace?
A quality carbide-tipped blade (like a Freud Diablo, Forrest Woodworker II, or Ridge Carbide TS2000) can be resharpened 3-5 times before the carbide tips are too small to sharpen again. Professional sharpening costs $15-25 for a 10" blade and restores cutting performance to near-new levels. Replace the blade when:- Multiple teeth are chipped or missing
- The blade body is warped (check by laying it on a flat surface)
- The carbide tips have been sharpened to minimum size
- The blade is a cheap commodity blade — sharpening costs more than a new blade
