Can you get a broken drill bit out? Yes, you absolutely can! While it’s a frustrating situation, there are several effective methods to remove a broken drill bit stuck in metal or a drill bit lodged in material. This guide will walk you through the best techniques and tools for tackling this common workshop problem, from dealing with a snapped drill bit repair to the delicate task of broken tap removal.
A broken drill bit is a common annoyance for DIYers and professionals alike. It happens. You’re drilling, perhaps into hardened steel or a particularly stubborn piece of wood, and then – snap! Your drill bit breaks off, leaving a frustrating metal fragment embedded in your workpiece. This can halt your project and leave you wondering how to proceed. But don’t despair; with the right knowledge and tools, you can often rescue your project and your sanity.
This comprehensive guide will cover everything you need to know about removing a broken drill bit. We’ll explore various scenarios, from a small, flush break to a larger piece sticking out, and introduce you to essential tools like a broken bolt extractor and the handy easy out tool. We’ll also touch on how to handle situations involving a broken bolt extractor itself failing and the best approaches for extracting broken metal.
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Pinpointing the Problem: Identifying the Break
Before you can tackle removing a broken drill bit, it’s crucial to assess the situation. The best method often depends on how much of the drill bit is exposed and the material it’s stuck in.
Types of Drill Bit Breaks:
- Flush Break: The bit has broken off perfectly even with the surface of the material. This is often the most challenging type to remove.
- Protruding Break: A portion of the drill bit sticks out from the material, offering a potential grip point.
- Deeply Lodged Break: The bit has broken off deep within the material, making access difficult.
- Damaged Hole: The break might have caused the material around the hole to deform, complicating removal.
Your approach will vary significantly based on these factors. A bit sticking out is easier to grab than one flush with the surface.
Essential Tools for Bit Extraction
Several specialized tools are designed to help with removing a broken drill bit. Having the right gear can make a significant difference in success and effort.
Key Tools You’ll Need:
- Penetrating Oil: Essential for loosening rusted or seized bits. Brands like WD-40, PB Blaster, or Kroil are excellent choices.
- Center Punch: Used to create a small indentation, guiding your drill for subsequent steps.
- Drill Bits (Smaller than the Broken Bit): You might need these for drilling pilot holes or creating a divot for an extractor.
- Drill Bit Extractor Set (or “Easy Out” Set): These are specifically designed to grip and twist out broken fasteners. They have a reverse spiral flute.
- Pliers (Vise-Grips or Needle-Nose): Useful for gripping protruding bits.
- Hammer: For tapping tools and to aid in loosening.
- Safety Glasses: Absolutely non-negotiable. Metal shards can fly.
- Gloves: For grip and protection.
- Magnifying Glass/Headlamp: To clearly see what you’re doing, especially with small breaks.
- Left-Handed Drill Bits: These drill in reverse. Sometimes, the reverse action is enough to back out the broken bit.
- Rotary Tool (Dremel) with Cutting Discs: For creating slots or grinding.
- Small Files or Grinding Stones: For shaping or creating access points.
- Magnetic Pickup Tool: To retrieve small metal fragments.
Understanding Drill Bit Extractor Sets:
A broken bolt extractor, often called an “easy out,” is a conical, hardened steel tool with reverse spiral threads. When you insert and turn it counter-clockwise into a drilled hole in the broken bit, its threads bite into the metal, gripping it firmly enough to unscrew the broken piece.
Here’s a quick look at how they typically work:
| Step | Action | Tool Used |
|---|---|---|
| Prepare the Material | Apply penetrating oil. | Penetrating oil |
| Create a Starting Point | Punch a dimple at the center of the break. | Center Punch |
| Drill a Pilot Hole | Drill a small hole into the broken bit. | Small drill bit |
| Insert the Extractor | Tap the extractor gently into the hole. | Hammer, Extractor |
| Turn and Extract | Slowly turn the extractor counter-clockwise. | Ratchet, Wrench, Extractor |
Methods for Removing a Broken Drill Bit
The approach you take will depend on the severity of the break and the tools you have available. Here are the most common and effective methods.
Method 1: Gripping and Twisting (For Protruding Bits)
If a portion of your drill bit is sticking out, this is your first and easiest option.
Steps:
- Apply Penetrating Oil: Generously spray the area with penetrating oil and let it sit for at least 15-30 minutes, or even overnight for stubborn breaks. This helps loosen any corrosion or binding.
- Grip Firmly: Use a good pair of locking pliers (like Vise-Grips) to get a solid grip on the protruding end of the drill bit.
- Gentle Twisting: Slowly and firmly try to turn the bit counter-clockwise. You might need to apply some upward pressure simultaneously.
- Rocking Motion: If it doesn’t budge, try a gentle rocking motion – a little left, then a little right – before attempting to unscrew it again. This can help break the bond.
- Repeat and Patience: Reapply penetrating oil and repeat the process. Patience is key here. Forcing it too hard can cause the bit to break off further or damage the threads in your workpiece.
When to Use: This is ideal when you have at least a few millimeters of the drill bit exposed and accessible.
Method 2: Using a Broken Bolt Extractor (Easy Out)
This is the go-to method for flush breaks or when gripping isn’t possible. It’s your best bet for removing a broken drill bit that’s firmly embedded.
Steps:
- Apply Penetrating Oil: As always, start with penetrating oil. Let it soak in.
- Create a Pilot Hole: This is critical. You need to drill a hole directly into the center of the broken drill bit.
- Use a Center Punch: Mark the exact center of the broken bit with a center punch and a hammer. This prevents your drill bit from wandering.
- Drill a Pilot Hole: Select a drill bit that is smaller than the broken drill bit. Ideally, choose a left-handed drill bit. If you don’t have one, use a standard bit, but remember you’ll be drilling counter-clockwise (if you’re using a reverse-threaded extractor). Drill slowly and steadily, ensuring you’re drilling straight into the center of the broken bit. The depth of the hole should be appropriate for the size of your extractor – usually about half the length of the extractor itself.
- Use a Left-Handed Drill Bit (Highly Recommended): When drilling the pilot hole with a left-handed bit, the bit might actually catch on the broken piece and unscrew it on its own! This is often the easiest solution if it works.
- Insert the Extractor:
- Tap Gently: Place the tip of the correct-sized easy out tool into the pilot hole. Gently tap it with a hammer to seat it securely.
- Select the Right Size: Ensure your extractor is sized appropriately for the hole you’ve drilled and the broken bit. Too large and it might expand the bit, making it harder to remove. Too small and it won’t get enough grip.
- Turn the Extractor:
- Use a Tap Wrench or Ratchet: Fit the extractor into a tap wrench or attach a ratchet to it.
- Slow and Steady: Turn the extractor slowly and firmly counter-clockwise. You’re essentially trying to back out the broken drill bit.
- Feel for Resistance: As you turn, you’ll feel the extractor’s threads bite into the broken bit. Keep applying steady, increasing pressure.
- Extraction: If all goes well, the broken drill bit will begin to turn and unscrew. Continue until it’s free.
What if the Easy Out Breaks? This is a nightmare scenario. Easy outs are made of hardened steel and are brittle. If one breaks off inside the broken drill bit, you have a much tougher problem. You’ll likely need to use more aggressive methods like drilling it out with a carbide bit or carefully grinding it away.
Method 3: Creating a Slot (For Flush or Slightly Recessed Bits)
If the bit is flush and an extractor doesn’t seem feasible, you might be able to create a slot for a screwdriver.
Steps:
- Apply Penetrating Oil: Start with penetrating oil.
- Use a Rotary Tool: With a thin cutting disc on a rotary tool (like a Dremel), carefully cut a slot across the face of the broken drill bit. Aim for a slot deep enough to accept a flathead screwdriver.
- Be Precise: This requires a steady hand. You don’t want to cut into the surrounding material.
- Use a Screwdriver: Once the slot is made, use a flathead screwdriver that fits snugly into the slot.
- Turn Counter-Clockwise: Apply firm, steady pressure to turn the bit counter-clockwise. You might need to tap the end of the screwdriver with a hammer to help it bite.
Considerations: This works best on softer metals. For very hard steel, cutting a slot can be difficult and may wear out your cutting discs quickly. This method can be useful for removing a stripped screw too, though the material is usually softer.
Method 4: Drilling It Out (A Last Resort)
If other methods fail, you may have to drill out the broken bit entirely. This often damages the original hole, requiring you to repair it or drill a larger one.
Steps:
- Center Punch: Mark the center accurately.
- Drill with Progressive Sizes: Start with a very small drill bit (ideally carbide if drilling steel) and drill directly into the center of the broken bit. Gradually increase the size of your drill bits, drilling out more of the broken bit each time.
- Keep it Centered: The key here is to stay as perfectly centered as possible. If you drift off-center, you’ll damage the surrounding material and potentially enlarge the hole significantly.
- Use Left-Handed Bits: If you have left-handed bits, try using them at each stage. The reverse cutting action might help back out pieces as you drill.
- Clean Out Debris: After drilling, use a pick or magnetic tool to remove any remaining fragments.
Caution: This method requires significant skill and precision. It’s easy to ruin your workpiece if you’re not careful.
Method 5: Welding a Nut (Advanced Technique)
This is a more advanced method but can be incredibly effective for larger broken bits, especially in metal. It’s often used for broken bolt removal.
Steps:
- Clean the Area: Ensure the broken bit and surrounding area are clean and free of oil and debris.
- Place a Nut: Find a nut that is slightly larger than the broken drill bit. Place the nut over the broken bit so the bit is centered inside the nut’s opening.
- Weld the Nut: Using a MIG welder, carefully weld the inside of the nut to the broken drill bit. You want a strong bond. Be careful not to weld the nut to the workpiece itself.
- Let it Cool Slightly: Allow the weld to cool for a minute or two. The heat can also help loosen the bit.
- Turn with a Wrench: Once it’s cool enough to handle but still warm, use a wrench to grip the nut and slowly turn counter-clockwise. The welded nut provides a substantial grip.
Considerations: This requires welding equipment and skill. It’s best suited for metal-to-metal applications and can warp thin materials if not done carefully.
Method 6: Using Heat
Heat can expand metal, which can help break the bond between the broken bit and the material.
Steps:
- Apply Penetrating Oil: Start by applying penetrating oil to the area.
- Heat the Surrounding Material: Use a heat gun or propane torch to gently heat the material around the broken drill bit. Avoid heating the bit itself directly if possible, as this might cause it to expand and seize further. The goal is to make the workpiece expand away from the bit.
- Let it Cool: Allow the area to cool slowly. As it cools, it will contract, potentially loosening the grip on the broken bit.
- Attempt Removal: Try one of the other methods (gripping, extractor) while the area is still slightly warm or after it has cooled.
Caution: Be extremely careful with heat, especially around flammable materials or delicate finishes. Always wear appropriate safety gear.
Dealing with Specific Scenarios
Let’s look at some common situations and how to handle them.
Drill Bit Stuck in Metal
Drill bits stuck in metal, especially hardened steel, can be particularly tough.
- Penetrating Oil is Key: For drill bit stuck in metal, allowing penetrating oil to work its magic is paramount.
- Left-Handed Drill Bits: These are exceptionally useful for metal. The reverse rotation can often unscrew the broken piece.
- HSS or Cobalt Bits for Pilot Holes: If you need to drill into the broken bit (made of hardened steel), use a drill bit made of even harder material, like cobalt or high-speed steel (HSS), or even a carbide bit for very tough jobs.
- Drilling with a Rotary Tool: For very small, flush breaks in metal, a rotary tool with a tiny diamond or carbide burr might be used to carefully grind away the edges or create a slot.
Broken Tap Removal
Broken taps are notoriously difficult to remove because they are made of hardened steel and have fine threads.
- Small Taps: For very small broken taps, an easy out tool designed for taps (often called a tap extractor) is the best bet. Like drill bit extractors, they have reverse flutes.
- Center Punching is Crucial: Accurately center punching the broken tap is vital to avoid damaging the tapped threads.
- Drilling with Carbide: If an extractor fails, you’ll likely need to drill out the tap using a carbide drill bit. This is challenging as you must avoid damaging the workpiece’s internal threads.
- Using EDM (Electrical Discharge Machining): For professional jobs on very valuable or critical components, EDM is a highly effective but specialized method for removing broken taps without damaging the surrounding material.
Removing a Stripped Screw
While the focus is on drill bits, the principles for how to remove a stripped screw are similar and often involve some of the same tools.
- Rubber Band Trick: Place a thick rubber band between the screwdriver and the stripped screw head for added grip.
- Screw Extractor Set: Just like a broken bolt extractor, screw extractor sets are invaluable. They work on the same principle of reverse threads.
- Cutting a Slot: If the head is accessible, a rotary tool can cut a slot for a flathead screwdriver.
- Pliers: For screws with protruding heads, locking pliers can often grip and turn them.
Snapped Drill Bit Repair
Technically, you can’t “repair” a snapped drill bit in the sense of rejoining it. The goal of snapped drill bit repair is to retrieve the broken piece so you can continue your work. If you manage to extract it cleanly, you might be able to use the non-broken portion again, but it’s usually a compromised tool.
Preventing Future Broken Bits
Prevention is always better than cure. Here’s how to minimize the chances of a broken drill bit:
- Use the Right Bit for the Job: Ensure your drill bit is suitable for the material you’re drilling. HSS for wood and soft metals, cobalt or titanium-coated bits for harder metals.
- Proper Speed and Feed Rate: Drilling too fast or applying too much pressure can overheat and break bits. Consult charts for recommended speeds based on bit size and material.
- Lubrication: Use cutting fluid or oil, especially when drilling metal. This cools the bit, reduces friction, and helps clear chips.
- Sharp Bits: Dull drill bits require more force, increasing the risk of breakage. Keep your bits sharp.
- Clear Chips: Regularly back the drill bit out of the hole to clear chips, especially in deep holes. This prevents binding and overheating.
- Start with a Pilot Hole: For larger holes, always start with a smaller pilot hole.
- Secure Your Workpiece: Ensure your workpiece is firmly clamped down so it doesn’t move unexpectedly.
Frequently Asked Questions (FAQ)
Q1: What is the best way to remove a broken drill bit?
A1: The best way depends on how the bit broke. If it’s protruding, try gripping it with pliers. For flush breaks, a drill bit extractor (easy out) is usually the most effective tool after drilling a pilot hole.
Q2: Can I drill out a broken drill bit with a regular drill bit?
A2: You can try, but it’s difficult. Broken drill bits are made of hardened steel. You’ll have the best success if you use a smaller, left-handed drill bit (which may unscrew the broken piece itself) or a very hard material like cobalt or carbide for drilling into the broken bit.
Q3: My broken drill bit is stuck in metal. What should I do?
A3: Apply penetrating oil liberally and let it soak. Then, attempt to use a drill bit extractor. Using a left-handed drill bit to create the pilot hole is also highly recommended for metal.
Q4: How do I use a broken bolt extractor?
A4: First, center punch the broken bit. Then, drill a pilot hole directly into the center of the broken bit. Gently tap the extractor into the pilot hole, and then slowly turn it counter-clockwise with a wrench or tap handle. The extractor’s reverse threads will bite into the bit and unscrew it.
Q5: What is an easy out tool used for?
A5: An “easy out” tool, also known as a screw or bolt extractor, is used to remove broken screws, bolts, or drill bits that are seized or snapped off within a workpiece.
Q6: I have a broken screw removal kit. Will it work for a broken drill bit?
A6: Yes, most screw removal kits contain drill bit extractors and center punches that are suitable for removing broken drill bits.
Q7: How do you get a drill bit lodged in material out?
A7: If the drill bit is lodged and not completely broken off, try using gripping tools like Vise-Grips. If it has snapped, you’ll need to follow the extraction methods outlined above, starting with penetrating oil and potentially using a drill bit extractor.
Q8: Is there a way to do snapped drill bit repair?
A8: You cannot repair a snapped drill bit itself. “Snapped drill bit repair” refers to the process of successfully removing the broken piece from your workpiece so you can continue your project.
Q9: What are the best methods for extracting broken metal?
A9: Methods for extracting broken metal include using pliers for protruding pieces, employing drill bit or screw extractors for flush breaks, cutting slots for screwdrivers, or in advanced cases, welding a nut onto the broken piece.
Q10: My broken tap removal didn’t work with an extractor. What now?
A10: If an extractor fails for broken tap removal, you may need to drill out the tap with a very hard drill bit (carbide) while being extremely careful not to damage the existing threads. For critical applications, EDM is the professional solution.
Conclusion:
Dealing with a broken drill bit is a common woodworking or metalworking challenge, but it’s rarely insurmountable. By carefully assessing the situation, choosing the right tools, and employing patience, you can effectively tackle removing a broken drill bit and get your projects back on track. Remember safety first – always wear eye protection! With this guide, you’re well-equipped to conquer even the most stubborn of breaks, whether it’s a simple drill bit stuck in metal or the delicate process of broken tap removal. Happy fixing!