Diagnosis
This issue is typically caused by one of two things: axial misalignment of the drill bit or a failure of the internal chuck jaw mechanism. In the Avid Power 20V model, the keyless chuck relies on a three-jaw system that must close concentrically. If the bit is not seated fully against the back of the chuck bore, or if the jaws are tightened unevenly, the bit will "wander" or wobble during rotation. This creates a centrifugal force that makes the bit appear to bend, even if the metal is straight. To confirm the root cause, perform a "Run-Out Test." Insert a straight-shank drill bit and hold the drill steady. Slowly rotate the chuck by hand while watching the tip of the bit. If the tip describes a small circle, the bit is seated incorrectly or the jaws are worn. If the entire chuck assembly moves independently of the spindle (the metal shaft it sits on), the internal retaining nut or the spindle itself has become loose or bent, which is a mechanical failure of the tool's drivetrain.
How to Fix It
Follow these steps to reset the chuck alignment and ensure a secure grip on the bit.
- Power Down: Remove the 20V battery pack from the base of the handle to prevent accidental activation during the adjustment process.
- Clear the Jaws: Open the chuck collar fully by rotating it counter-clockwise. Use a can of compressed air or a soft brush to remove any metal shavings or sawdust trapped inside the jaw recesses, as debris prevents the jaws from closing evenly.
- Deep Seating: Insert the drill bit. Ensure the shank is pushed firmly all the way to the back of the chuck. If there is a gap between the bit shoulder and the chuck face, the bit will wobble.
- Manual Pre-Tighten: Rotate the outer collar clockwise by hand until it makes firm contact with the bit shank. Do not over-torque it by hand; just ensure it is snug.
- Power-Locking: While holding the chuck collar firmly with your non-dominant hand, squeeze the trigger for a fraction of a second in the forward (clockwise) direction. The sudden torque from the motor forces the internal jaws to lock symmetrically around the bit.
- Verification: Rotate the chuck by hand one last time to ensure the bit remains centered and does not slip.
If That Didn't Work
- Replace the Drill Bit: Check the shank of your bit for bends or wear. Many beginner sets include bits with slight manufacturing variances. Swap the current bit for a high-quality titanium or cobalt bit with a perfectly cylindrical shank to see if the wobble persists.
- Inspect the Spindle: If the entire chuck assembly is wobbling, the spindle may be bent. Hold the drill and gently wiggle the chuck side-to-side. If you feel a "click" or movement, the internal bearings are shot. In this case, the tool requires a professional replacement of the gearbox assembly.
- Lubricate the Jaws: If the chuck is difficult to tighten or feels "gritty," apply a single drop of light machine oil (like 3-in-1 oil) to the jaw tracks. Open and close the chuck several times to distribute the lubricant, then clean off any excess with a rag.
- Check for Over-Tightening: If you have used pliers to tighten the chuck in the past, you may have stripped the internal threads. If the collar spins freely without gripping the bit, the internal gearing is stripped and the chuck must be replaced.
Heads Up
- Avoid Side-Loading: Never apply heavy lateral pressure to the drill bit while it is rotating. This puts immense stress on the chuck bearings and is the primary cause of permanent spindle wobble.
- No Hammering: The Avid Power 20V is a driver/drill, not a hammer drill. Never use the chuck or the bit as a chisel or hammer, as this will knock the jaws out of alignment.
- Bit Matching: Ensure you are using bits with the correct shank diameter. Using a bit that is too small for the chuck's minimum grip range will result in inevitable slipping and wobble.
- Storage Tip: Always remove bits from the chuck when storing the drill in a toolbox. If the drill is dropped while a bit is inserted, the bit acts as a lever that can bend the internal spindle.