Symptoms
- Cut curves off to one side even when feeding straight
- Blade seems to lead at an angle relative to the fence
- Cuts require constant steering to stay on line
- Problem is consistent in one direction
Likely causes
- CommonBlade guides not adjusted close enough to the bladeGuides that are too far back let the blade twist and drift.
- CommonBlade tension too lowAn undertensioned blade flexes and wanders more easily.
- CommonDull or unevenly sharpened blade teethUneven tooth wear causes the blade to naturally cut toward one side.
- PossibleWheel tracking (blade position on the wheels) offIncorrect tracking changes how the blade rides and can cause drift.
- PossibleFence not aligned to the actual drift angleFences set at true 90 degrees don't account for a blade's natural drift.
What to do
- Check and adjust blade tension to the level recommended for the blade width being used.
- Adjust the blade guides (both above and below the table) so they're close to but not touching the blade.
- Make a freehand test cut following a straight pencil line without the fence to find the blade's natural drift angle.
- If there's a drift angle, angle the fence to match it rather than fighting the blade with pressure.
- Replace the blade if it's dull or shows uneven tooth wear.
- Recheck wheel tracking per the saw's manual if drift continues after the above steps.
Tools and parts
- Band saw
- Tension gauge (optional)
- Wrench for guides
Band saw bladeSearch: “band saw blade replacement correct length and TPI”
When to call a pro
If drift persists after guide, tension, and fence adjustments, a tool repair shop can check wheel alignment and tracking.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.