fence on my milwaukee won't stay square to the blade, it drifts when i lock it down

Diagnosis

The drift occurring on the Milwaukee M18 FUEL Table Saw (2736-20) is typically caused by insufficient tension in the front fence clamping mechanism. This saw utilizes a cam-action locking system designed to pull the fence tight against the guide rail. When this system loses its "bite," the fence may feel locked to the touch, but the physical connection is loose enough that the lateral pressure of a workpiece pushing against the fence forces it to pivot or slide out of square. This usually happens because the eccentric cam pin—the off-center pivot that converts the lever's rotation into clamping pressure—has shifted or the tensioning screw has backed out due to vibration. You can confirm this by locking the fence and attempting to wiggle it with a moderate amount of force; if you can feel a "click" or a slight shift before it binds, the cam is not engaging deep enough into the rail's locking channel. Over time, sawdust buildup in the rail channels can also create a microscopic gap, preventing the clamp from seating fully flush.

How to Fix It

To resolve the drift and restore a rigid, square lock, you need to adjust the tension of the cam-lock mechanism. You will need a 4mm or 5mm hex key (depending on the production date of your unit) and a high-quality machinist square.

1. Clear all sawdust from the guide rails and the underside of the fence using compressed air. Any debris here will prevent the clamp from seating correctly.
2. Slide the fence completely off the saw to gain full access to the underside of the locking assembly.
3. Locate the front locking lever assembly. Look for the eccentric cam pin located at the pivot point of the lever. This is the small, off-center pin that rotates to apply pressure.
4. Insert your hex key into the adjustment screw associated with the cam. Rotate the screw clockwise in small increments (1/8th turns). This pushes the cam further into the rail, increasing the clamping force.
5. Slide the fence back onto the rails and engage the lock. Attempt to move the fence; it should now feel "frozen" with zero perceptible play.
6. Place your machinist square against the blade (ensure the blade is lowered and the battery is removed for safety) and slide the fence to the 90-degree mark. Lock it down and check for square.
7. If the fence still drifts slightly, repeat the clockwise adjustment on the cam pin until the lock is absolute.

If That Didn't Work

• Check for Rail Deformation: Inspect the aluminum guide rails for any dents or burrs. If the rail is pinched or bent even by a fraction of a millimeter, the fence will not sit flat, causing it to "spring" out of square once the lock is released. Use a fine-grit sanding block to remove any burrs from the rail surface.
• Inspect the Locking Lever Spring: Check the return spring on the locking handle. If the spring has lost tension or is kinked, it may not be providing the necessary leverage to fully seat the cam. Replace the spring if it appears stretched or fatigued.
• Verify Blade Alignment: Ensure the drift isn't actually a blade alignment issue. Loosen the blade mounting bolts and ensure the blade is perfectly parallel to the miter slot. If the blade is skewed, the fence will appear to drift even if the locking mechanism is functioning perfectly.
• Lubricate the Rails: Apply a very thin layer of dry PTFE lubricant to the guide rails. This prevents the fence from "stuttering" as you slide it, which can sometimes cause the fence to sit slightly crooked just before you engage the lock.

Heads Up

• Avoid Over-tightening: Do not over-torque the eccentric cam screw. Over-tightening can warp the aluminum rail or strip the threads in the casting, which will permanently ruin the fence's ability to lock.
• Clean the Channels: Dust buildup in the T-track is the #1 cause of "phantom drift." Clean the rails every 5-10 cuts to ensure the clamp seats fully.
• Safety First: Always remove the M18 battery pack before performing any adjustments to the fence or blade to prevent accidental startup.
• Check Square Regularly: Table saws are subject to vibration. Check the squareness of your fence every few projects to ensure the cam hasn't vibrated loose.