Safety— Stop and inspect before you diagnose
Some symptoms are warnings, not nuisances. After any kickback, DEWALT says to turn the saw off and check the riving knife, anti-kickback assembly and guard before going on. Stop, too, for a blade that wobbles, a cut that binds or stalls the motor, or a blade that is cracked or missing teeth. Turn the saw off and unplug it before reaching in to look — DEWALT's manual says the same for clearing a jam.
Symptoms and causes
Symptoms
- The work binds or pinches during a rip
- Burn marks on the cut edge
- Rough, uneven or chipped cuts
- Splintering on the underside of the cut
- The blade wobbles or the saw vibrates
- Cuts out of square to the face, or crosscuts out of square to the edge
- Rips that taper or wander off the line
- Kickback
Likely causes
| Cause | How to check |
|---|---|
| Fence out of parallel with the blade | Measure fence to blade at the front and rear of the blade; the readings should match (SawStop, DEWALT). |
| Blade not parallel to the miter slot | Measure from the slot to the same tooth at the front and back of the blade, with the saw unplugged. |
| Riving knife or splitter out of line | DEWALT: a straightedge against two blade tips must not touch the knife. |
| Warped, twisted or knotted stock, or no straight edge | Sight the board and run its edge against a straightedge; DEWALT says never to rip such stock. |
| Dull, damaged or pitch-coated blade | Inspect the teeth and plate with the blade off the saw. |
| The wrong blade for the material or cut | Compare the blade with its maker's stated use — rip, crosscut, combination or veneered panels. |
| Feeding too fast | SawStop lists it as a cause of binding but gives no rate; feed steadily and see whether the binding stops. |
| Damaged or unbalanced blade, or a mismatched arbor hole or washers | Blade flat and undamaged; its bore and the washers the ones the saw takes. |
| Worn bearings or belts, or an uneven floor | With the saw unplugged, any play in the arbor by hand; the saw standing firm and level. |
| Bevel stop or miter gauge set off | A square on the plate between teeth; a test crosscut checked with a square. |
| Fibres unsupported beside the blade | The gap between the blade and the insert. |
Fixes
| Problem | Fix |
|---|---|
| Binding, pinching or burn marks | Align the fence and riving knife; joint a straight edge or reject the board; clean or replace the blade; feed steadily. |
| Rough or chipped cuts | Clean, sharpen or replace the blade, or fit one made for the material. |
| Underside splintering | A zero-clearance insert and a high-ATB plywood blade. |
| Wobble or vibration | Stop. Replace a damaged blade or washers; have bearings and belts serviced; level the saw. |
| Out-of-square cuts | Reset the bevel stop and scale, the miter gauge, and the blade's alignment to the slot, as the manual describes. |
| Tapering or wandering rips | Align fence and blade; joint an edge; use a featherboard to hold the work to the fence. |
| Kickback | Turn the saw off and check the riving knife, pawls and guard before going on (DEWALT); then find the cause above. |
Kickback, and what a kickback guard does
Kickback is the fault that matters most. DEWALT describes it as the work binding between the blade and the fence or another fixed object, rising from the table and being thrown toward the operator; its compact-saw manual adds that the cause is a pinched or jammed blade or a line of cut out of line with the blade, and that most often the rear of the blade lifts the work. Every cause in the table above that pinches the work — a fence closing toward the back, stock that twists, a cut that closes behind the blade — is a kickback cause too.
What is often called a kickback guard is the set of anti-kickback devices the CPSC describes on current saws: a splitter or riving knife that keeps the cut from closing on the blade, and toothed pawls that let the work pass forward and resist it moving back. They reduce the risk; they do not remove it. DEWALT tells owners to check the pawls before ripping by pushing wood under them — the teeth must stop it being pulled back — and warns that in hard, slippery material they may not stop a kickback. See blade guards, riving knives and splitters for how each is set, and the safety guide for the full list of causes and precautions.
A saw that "won't cut you" does not exist. SawStop's brake stops the blade within about 3 to 5 milliseconds of detecting contact, and SawStop itself says a minor injury is still possible and that the system is a last measure. A brake changes the outcome of a mistake; the habits above still prevent it.
Wobble and vibration
OSHA's standard asks for machines free from sensible vibration with their largest blade running at full speed, and arbors free from play. A blade that visibly wobbles is a reason to stop. SawStop's troubleshooting table lists a damaged or unbalanced blade, worn bearings, worn belts and an uneven floor; DEWALT's manual adds blades whose arbor hole does not match the saw's mounting, which run off-centre, and damaged flanges or washers. Check the blade first — flat, undamaged, the right bore — then the washers and nut, then, with the saw unplugged, whether the arbor moves by hand. Bearings and belts are a service job. OSHA prohibits the improvised "wobble saw" made by wedging a blade off-square between its collars; a blade should only ever run square to its arbor.
Burn marks and binding
None of the manuals reviewed has a row for burn marks, but they describe what causes them: the blade rubbing the work. That happens when the work is pressed against the blade — a fence out of parallel, a riving knife out of line, stock that bows into the cut — or when a dull or pitch-coated blade binds and overheats. DEWALT warns that material built up on the blade raises the risk of overheating and binding. Work through the binding causes first: align the fence and knife, check the board, then clean or replace the blade. See cleaning and adjusting the blade.
Inaccurate cuts
Cuts out of square or that wander usually trace back to one reference being off. Check them in order: the blade parallel to the miter slot, the fence parallel to the blade, the bevel stop at 0°, the miter gauge at 90° and free of play in its slot. A saw that drifts out of adjustment between checks may have play in its handwheels or compacted dust in the mechanism; SawStop's troubleshooting table lists both. See fences, miter gauges and crosscut sleds for the alignment steps.
Stop and inspect
- After any kickback: saw off, guarding system checked
- A blade that wobbles, is cracked or has damaged teeth
- Work that binds, smokes or stalls the motor
- A guard, knife or pawl that does not move freely or is out of line
- Unusual noise or vibration from the saw
- Unplug before reaching in to look
Sources
Causes are drawn from a saw maker's troubleshooting table and from kickback warnings in saw manuals. No maker reviewed gives a burn-mark entry or a feed-rate figure, so this guide gives none; burn marks are treated as a sign of the blade rubbing the work, under the binding and rough-cut causes the makers list.
- 1.
Owner's Manual, 10" Professional Cabinet Saw, Model PCS31230. SawStop.
Used for: SawStop's troubleshooting table: material binding on a rip (fence misaligned, warped material, feed rate too high, spreader or riving knife misaligned); cuts not clean or even (dull blade, pitch or gum on the blade, wrong blade, fence misaligned); excessive vibration (damaged or unbalanced blade, uneven floor, worn bearings, worn belts); inaccurate bevel and miter cuts; play in the handwheels; table and blade alignment to the miter slot.
- 2.
DWE7491 10" (254 mm) Job Site Table Saw, Instruction Manual. DEWALT.
Used for: Kickback as work binding between the blade and the fence or another fixed object; the pawls checked before ripping; turning the saw off after a kickback and checking the riving knife, anti-kickback assembly and guard before resuming; the bevel stops set with a square.
- 3.
DWE7485 8-1/4" (210 mm) Compact Job Site Table Saw, Instruction Manual. DEWALT.
Used for: Kickback from a pinched or jammed blade or a misaligned line of cut, with the work most often lifted by the rear of the blade; twisted, knotted or warped stock misaligning the kerf; blades clean, sharp and set to minimise binding; material building up on the blade raising the risk of overheating and binding; mismatched arbor holes or mounting hardware running a blade off-centre; switching off and unplugging to clear a jam.
- 4.
29 CFR 1910.213, Woodworking machinery requirements. U.S. Department of Labor, Occupational Safety and Health Administration.
Used for: Machines free from sensible vibration with the largest tool idle at full speed; arbors free from play; dull, badly set or gummed saws removed or cleaned; the improvised wobble saw prohibited; cracked saws removed from service.
- 5.
Safety Standard Addressing Blade-Contact Injuries on Table Saws (supplemental notice of proposed rulemaking), 88 FR 74909. U.S. Consumer Product Safety Commission, Federal Register, 2023.
Used for: Active injury mitigation systems that detect contact and act, and the anti-kickback devices — splitters, riving knives and pawls — fitted to current saws.
- 6.
10" saw blade specifications (LM72R010, LU87R010, LU84R011, LU83R010, LU85R010, LU80R010, LU79R010, LU91R010). Freud Tools.
Used for: Blades made for chip-free edges in veneered plywood and melamine, as a blade-choice cause of rough cuts.
- 7.
Table Saw Zero Clearance Inserts. Infinity Cutting Tools.
Used for: Zero-clearance inserts supporting the fibres to the cut to reduce tear-out on the underside.
About this troubleshooting
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