Table saw trunnion adjustment is a critical process for maintaining the accuracy and safety of your table saw. It involves aligning the blade with the miter slots and ensuring it remains perpendicular to the table surface. Proper trunnion adjustment can significantly improve cut quality, reduce kickback risk, and extend the life of your saw blade. This guide will walk you through the steps of trunnion adjustment, common issues, and maintenance tips.
What is a Table Saw Trunnion?
A trunnion is a mounting assembly that supports the arbor and blade of a table saw. It allows the blade to tilt and adjust in height while maintaining alignment with the table surface. Proper trunnion adjustment is crucial for accurate and safe cuts.
Why is Table Saw Trunnion Adjustment Important?
Trunnion adjustment ensures:
- Blade alignment with miter slots
- Perpendicular blade-to-table relationship
- Accurate bevel cuts
- Reduced vibration and wear on the saw
How to Perform Table Saw Trunnion Adjustment?
Step 1: Preparation
Before beginning the adjustment process, gather the following tools:
- Combination square or dial indicator
- Wrench set
- Screwdriver
- Hammer (for minor adjustments)
- Feeler gauges
Step 2: Check Current Alignment
- Unplug the saw for safety
- Raise the blade to its maximum height
- Place a combination square against the miter slot
- Check if the blade is parallel to the miter slot
Step 3: Locate Trunnion Bolts
Trunnion bolts are typically located:
- Under the table for cabinet saws
- At the back of the saw for contractor saws
Step 4: Loosen Trunnion Bolts
Slightly loosen the trunnion bolts to allow for adjustment. Don’t remove them completely.
Step 5: Adjust Trunnion Position
Use gentle taps with a hammer or adjusting screws (if available) to move the trunnion until the blade aligns with the miter slot.
Step 6: Verify Alignment
Recheck the alignment using the combination square or dial indicator. The blade should be within 0.003″ to 0.005″ of parallel to the miter slot.
Step 7: Tighten Trunnion Bolts
Once aligned, carefully tighten the trunnion bolts, checking alignment after each turn to ensure it doesn’t shift.
What Are Common Issues with Table Saw Trunnion Adjustment?
- Difficulty accessing trunnion bolts
- Trunnion shifting during tightening
- Worn or damaged trunnions
- Misaligned arbor
How to Maintain Proper Trunnion Adjustment?
Regular maintenance includes:
- Checking alignment monthly
- Lubricating trunnion components
- Inspecting for wear or damage
- Cleaning dust and debris from trunnion assembly
What Are the Signs of Misaligned Trunnions?
Look out for:
- Blade burning wood during cuts
- Difficulty making straight cuts
- Excessive vibration during operation
- Inaccurate bevel cuts
How Often Should Table Saw Trunnion Adjustment be Performed?
| Usage Frequency | Recommended Adjustment Interval |
|---|---|
| Daily | Every 3-6 months |
| Weekly | Every 6-12 months |
| Occasional | Annually or as needed |
What Are Advanced Trunnion Adjustment Techniques?
For precision adjustment:
- Use a dial indicator for measurements
- Employ PALS (Precision Alignment and Locking System) if available
- Use shims for fine-tuning trunnion position
How Does Trunnion Design Vary Among Table Saw Types?
- Cabinet Saws: Heavy-duty trunnions mounted to the cabinet
- Contractor Saws: Lighter trunnions attached to the table
- Hybrid Saws: Combination of cabinet and contractor saw designs
What Safety Precautions Should Be Taken During Trunnion Adjustment?
- Always unplug the saw before adjusting
- Wear safety glasses and gloves
- Be cautious of sharp blade edges
- Avoid over-tightening bolts
How to Troubleshoot Persistent Alignment Issues?
If alignment problems persist:
- Check for worn arbor bearings
- Inspect table flatness
- Verify miter slot parallelism
- Consider professional servicing
By following these guidelines, you can ensure your table saw maintains optimal performance through proper trunnion adjustment. Remember, a well-adjusted saw is not only more accurate but also safer to operate.
References:
1. Popular Woodworking – Accurize Your Tablesaw
2. Woodgears – Table Saw Alignment
3. LumberJocks – Delta 36-725 Table Saw Blade Alignment Procedure