Section hub · Troubleshooting
Troubleshooting blades, bits and discs: causes and fixes
Most accessory problems trace to one of four causes: the accessory is dirty or dull, it is the wrong type for the material, it is run at the wrong speed or feed, or the tool is out of alignment. Burning saw blades, wandering drill bits, swirl marks, router burn and snapping blades usually clear once that cause is fixed. A vibrating grinder disc is different: stop and inspect before anything else. The guides below take each symptom in turn, most common cause first, and say when to replace rather than fix.
On this page
- Where should you start when an accessory misbehaves?
- Why does a saw blade burn wood?
- Why does a drill bit walk?
- Why does a random orbital sander leave swirl marks?
- Why does a router bit burn or chip the wood?
- Why do reciprocating saw blades break?
- What should you do if a grinder disc vibrates?
- When should you replace an accessory instead of fixing it?
Where should you start when an accessory misbehaves?
Start with the cheapest check and work toward replacement: clean the accessory, confirm it is the right type and fits properly, check speed and feed, check the tool's alignment, and only then replace the accessory. That order matters because the most common belief about cutting problems, that a burning or slow cut means the edge is dull, is often wrong. Baked-on pitch causes burning while the carbide underneath is still sharp, and a fence that is out of line burns wood with a brand-new blade.
Some symptoms are safety warnings rather than quality problems. A grinder wheel that vibrates, a saw that kicks back or a router bit that creeps in its collet should be stopped, unplugged and inspected before any further cutting. The table below lists each symptom covered here, the cause to check first and the guide that goes further.
| Symptom | Check first | Then check |
|---|---|---|
| Saw blade burns wood | Pitch build-up on the blade | Fence and riving-knife alignment, feed rate, tooth count |
| Drill bit walks off the mark | Bit type and point for the surface | Starting method, speed, pressure |
| Swirl marks after sanding | Pressure and travel speed | Skipped grits, debris, worn pad |
| Router bit burns or chips | Feed rate and direction | Bit sharpness, spiral direction, depth per pass |
| Reciprocating blade snaps | Shoe held against the work | Forcing in metal, blade thickness, TPI |
| Grinder disc vibrates | Stop and inspect the wheel | Fit on spindle, flanges, speed rating, expiry |
Why does a saw blade burn wood?
Most often because of baked-on pitch, a misaligned fence or riving knife, or a feed that is too slow, and less often because the teeth are dull. Clean the blade first with a blade cleaner rather than oven cleaner, which makers warn can damage the coating and weaken the cobalt binding the carbide. Makita adds that hardened gum and pitch slow the saw and raise kickback risk.
Alignment comes next. A fence toed in toward the blade crowds the work against it, and Woodcraft suggests toeing the outfeed end of the fence away by no more than about .004 in, since too much toe-out burns the other face. The guide to saw blade burn marks works through each cause with the fix.
Why does a drill bit walk?
Because an ordinary twist drill has no point that holds it in place on a flat surface. In metal the fix is a spotting or pilot drill, in wood a brad-point bit whose centre spur holds the line, and split-point drills reduce the drift in both. Starrett describes its split-point drills, ground to 135 degrees, as self-centring and needing less feed pressure.
The bit's material changes the risk when it does wander. Hard, brittle bits such as cobalt and carbide snap if the drill tilts, so keep the drill straight while the hole starts. The guide on stopping a drill bit walking covers starting methods for metal, wood, tile and masonry.
Why does a random orbital sander leave swirl marks?
Usually from too much pressure, moving too fast, or skipping grits, and sometimes from debris trapped under the disc. Use light pressure of about 2–4 lb, move at about 1 in per second, and skip no more than one grit; extra pressure slows the pad's rotation and leaves stretched loops and dished areas.
Cleanliness and equipment come next. Vacuum the surface between grits so loose coarse grit is not dragged under the finer disc, clean the pad before fitting a disc, and replace a worn pad whose edges have rounded. Popular Woodworking says sanders with small orbits, under under 1/8 in, are for finishing, while large-orbit sanders leave bigger, more visible swirls. Skipped grits are the hardest to spot, because the deep scratches often show only once stain or lacquer goes on. The guide to pigtail marks after sanding lists every cause with its fix.
| Cause | What happens | Fix | Sources |
|---|---|---|---|
| Skipping grits | Finer grit cannot remove the deep scratches, which show after stain or lacquer | Skip no more than one grit; work up through the sequence | Klingspor, Mirka, Wood Shop News, Woodcraft |
| Too much pressure | Pad rotation slows or stops, leaving long stretched swirls and dished areas | Light pressure, about 2-4 lb; let the sander's weight do the work | Popular Woodworking, Family Handyman, Woodsmith |
| Moving too fast | Uneven loops and stretched marks | About 1 in per second, or 5-10 s per 6 in | Family Handyman, Popular Woodworking |
| Tilting the sander | Gouges, scratches, rounded edges and shallow dips | Keep the pad flat; do not chase a scratch with the pad edge | Family Handyman, Woodsmith |
| Worn or damaged pad | Rounded pad edges make the sander hard to keep flat | Check the pad is flat edge to edge; replace when worn | Woodsmith |
| Debris under the disc or on the surface | A trapped chip creates a high spot; loose coarse grit scratches | Clean pad before fitting a disc; vacuum between grits | Woodsmith, Family Handyman |
| Low-quality discs | A few oversize particles cut too deep | Use quality discs with uniform grit | Family Handyman |
| Large-orbit sander for finishing | Larger loops are more visible | Use a small-orbit sander, or hand sand with the final grit | Popular Woodworking, Family Handyman |
| Starting or landing the sander carelessly | A running pad dropped onto the wood can dig in | Set the sander on the work before starting, or sweep it on before full speed (sources differ) | Family Handyman, Woodsmith |
The speed-dial setting as a swirl cause was not found in a fetched source. Popular Woodworking only says lower speed helps you control the sander, for example on veneer.
Why does a router bit burn or chip the wood?
Burning comes mainly from a feed that is too slow or uneven, and from dull bits; chipping and tear-out come from feed direction, spiral direction and bit design. Feed steadily against the bit's rotation, take deep cuts in several passes, and never use dull or damaged bits, which overload the motor and can snap. Feeding slowly to get a cleaner cut backfires: very fine chips carry less heat away and the edge dulls sooner.
Tear-out on the top face of sheet stock often means an up-cut spiral, which lifts the top fibres; a down-cut or compression spiral leaves a clean top edge. Climb cutting, feeding in the same direction the bit turns, can pull the router out of control. The guide to router tear-out fixes pairs each symptom with its cause.
Why do reciprocating saw blades break?
Mainly because the saw's shoe is not held against the work or the blade is forced, especially in metal. DeWalt ties forcing the blade in metal to shortened life and breakage, and keeping the shoe pressed firmly against the material stops the saw jumping and reduces breakage.
Blade choice plays a part too. Demolition blades are made thicker and taller so they resist bending; Lenox's are .062 in (1.6 mm) thick, against much thinner blades for sheet metal. A thin blade is the wrong choice for cutting nail-embedded framing. TPI must also suit the thickness, with Lenox advising 2–3 teeth in the material at all times. The guide on why recip blades break covers each cause and the blade that prevents it.
What should you do if a grinder disc vibrates?
Stop the grinder, unplug it or remove the battery, and inspect the wheel before running it again. A wheel that has been dropped should be discarded, a cracked wheel gives a dead sound instead of a clear ring when ring-tested, and resin-bonded wheels must not be used after the expiry date marked on them.
Then check the mounting. The wheel must slide freely onto the spindle without being forced, both flanges must be clean, flat and the same diameter, and the wheel's maximum speed must be at least the grinder's no-load speed. After refitting, run the wheel for at least 1 minute at operating speed with the guard on, standing out of line with it. The guide to why a grinder disc vibrates sets out the safety checks in order.
When should you replace an accessory instead of fixing it?
Replace it when the fault is in the accessory and cannot be cleaned or adjusted away, or when it has been damaged in a way that affects safety. A grinder wheel that has been dropped, is past its expiry or fails the ring test is replaced, not tested in use. A router bit that is dull or damaged is replaced or sharpened, because makers say never to run one. A sanding pad whose hooks are crushed or whose edges have rounded is replaced once cleaning no longer holds discs.
A saw blade is the case where replacing too early is common. Clean it first; if it still burns once clean on an aligned saw, the teeth are the remaining cause. The buyer guides compare replacements on published specs once you know what failed.
All troubleshooting guides
- Why a circular saw blade burns woodPitch, alignment, feed and teeth
- Why a drill bit walksFixing wandering holes
- Why a sander leaves swirl marksGrit, speed and pad fixes
- Router bit burning or chippingFeed, speed and sharpness
- Reciprocating saw blades breakingCauses and prevention
- Angle grinder disc vibrationCauses and safety checks
Questions readers ask
Does a burning saw blade always need sharpening?
No. Baked-on pitch often causes burning while the teeth are still sharp, and fence or riving-knife alignment, feed rate and stock condition also cause it. Clean the blade and check alignment before sharpening.
Should I press harder if my orbital sander is slow?
No. Extra pressure slows the pad's rotation and leaves swirls and dished areas. Use light pressure of about 2–4 lb and change a dull disc instead.
Is it safe to keep using a grinder wheel that wobbles?
No. Stop, disconnect the grinder and inspect the wheel. Discard it if it has been dropped, is cracked, fails the ring test or is past its expiry date.
Why does my drill bit skate across metal?
An ordinary twist drill has no point to hold it on a flat surface. Start with a spotting or pilot drill, or use a split-point drill, which wanders less.
Where to go next
- Why a circular saw blade burns woodThe most common cutting complaint, cause by cause.
- How-to guidesChoose the right teeth, TPI, grit or profile to begin with.
- Compatibility guidesRule out a fit or speed mismatch.
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