Symptoms
- 90-degree cuts leave a visible gap when two pieces meet
- Bevel scale reads zero but cut isn't square
- Problem is consistent across different blades
- Cut face looks slightly angled, not straight
Likely causes
- CommonBevel stop out of factory calibrationThe 0-degree bevel detent can shift out of true over time.
- PossibleFence not perpendicular to the table surfaceIf the fence itself leans, the blade will never square to it.
- PossibleDebris under the fence or table lifting it slightlySawdust buildup can tilt the fence a fraction of a degree.
- Less commonBent blade giving a false readingA warped blade can look square but cut slightly off.
What to do
- Unplug the saw before making any adjustments.
- Place a square flat against the table and up against the blade body (not the teeth) at the 0-degree bevel position.
- If there's a gap, loosen the bevel lock and adjust the calibration screw or stop bolt per the manual until the blade reads true square.
- Clean any sawdust from under the fence and table surfaces that could be causing a slight tilt.
- Recheck the fence itself for square against the table using the same square.
- Make a test cut in scrap and check the joint fit before moving to your project material.
Tools and parts
- Miter saw
- Engineer's square
- Screwdriver or hex key for calibration screws
When to call a pro
If the bevel won't hold calibration after adjustment, a repair shop can check for worn detents or a bent arm assembly.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.