Layout, Angles & Rule Tech · 9 min read
Calibrating a table saw blade to 0.1°: a repeatable method
A blade that reads 90° on the factory scale can still be off by a degree or more. Here is how to true it up with a digital angle gauge and keep it there.
By SQUAREFORGE Shop Desk · Updated
Key takeaways
- Trust a digital angle gauge on the blade body, not the saw's printed scale.
- Check calibration after any bevel adjustment or blade change.
- A test cut on scrap confirms the gauge reading in the real world.
Why the printed scale isn't enough
Factory bevel scales are cast into the trunnion and rarely read better than plus or minus a degree. For miters and box joints that need to close cleanly, that error compounds fast across four corners.
Setting up the check
- Clean the blade bodyWipe off resin so the gauge sits flat against the plate, not on a ridge of pitch.
- Zero the gauge on the tableRest the gauge on the saw table and zero it before moving to the blade.
- Read the blade at full tooth heightRaise the blade fully and place the gauge on a flat section of the plate, away from the teeth.
- Adjust the stop, not just the handwheelLoosen the bevel stop screw, nudge the trunnion until the gauge reads 90.0°, then re-lock the stop.
| Cut | Target angle | Tolerance to aim for |
|---|---|---|
| Square crosscut | 90.0° | ±0.1° |
| 45° miter (picture frame) | 45.0° | ±0.1° |
| Compound angle jig work | As specified | ±0.1° |
Keeping it calibrated
- Recheck after any bevel angle change, not just at 90° and 45°.
- Recheck after swapping blades, since plate thickness and runout vary.
- Store the angle gauge in a case; a dropped gauge can lose its own zero.
Layout accuracy checklist
| Frequency | Tasks |
|---|---|
| Before a project | Check squares and rulers against a known reference |
| During layout | Reference every mark from the same face or edge |
| Periodically | Inspect tool edges for nicks that throw off registration |
/ Frequently asked
How accurate should a digital angle gauge be?+
Look for a gauge rated to 0.1° resolution; most shop-grade units hold that accuracy once zeroed on a known flat surface.
Does blade runout affect the angle reading?+
Runout affects cut quality more than the angle reading, but a warped or bent plate can throw off a gauge resting on it. Check the blade for flatness if readings seem inconsistent.