Can you drill out a rivet? Absolutely! Drilling out a rivet is a common and effective method for its removal, allowing for repairs or replacements. This comprehensive guide will walk you through the entire process of how to drill out a rivet safely and efficiently. We’ll cover everything from selecting the right tools to the final steps of rivet extraction, ensuring you can confidently tackle any rivet removal task. Whether you’re dealing with a stubborn fastener or need to drill out a broken rivet, this guide has you covered.
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Gathering Your Essential Tools
Before you even pick up a drill, it’s crucial to have the right equipment. This will not only make the job easier but also significantly improve your safety. Here’s what you’ll need:
- Drill: A corded or cordless drill with variable speed control is ideal.
- Drill Bits: High-speed steel (HSS) drill bits are recommended for their durability and ability to cut through metal.
- Center Punch: To create a starting point for the drill bit, preventing it from wandering.
- Safety Glasses or Goggles: Absolutely essential to protect your eyes from flying metal shavings.
- Gloves: Heavy-duty work gloves will protect your hands from sharp edges and heat.
- Hammer: To tap the center punch.
- Measuring Tool (Ruler or Caliper): To determine the correct drill bit size.
- Wire Brush: For cleaning up debris.
- Penetrating Oil (Optional but Recommended): Can help loosen stubborn rivets.
- Clamps (Optional): To secure the workpiece if needed.
- Air Compressor and Blow Gun (Optional): For clearing debris efficiently.
- Rivet Head Removal Tool (Optional but Helpful): Specialized tools can assist, especially for certain rivet types.
Deciphering the Rivet: What You’re Up Against
Understanding the type of rivet you’re dealing with is the first step in successful rivet removal. While the general principle of drilling out a rivet applies to most, some nuances exist.
Common Rivet Types and Their Heads
- Solid Rivets: These are the traditional, most robust type. They have a pre-formed head on one end and a tail that is deformed (upset) to create a second head.
- Blind Rivets (Pop Rivets): These are designed for use when you can only access one side of the joint. They consist of a rivet body and a mandrel. When the mandrel is pulled, it expands the rivet body, creating the fastening.
- Structural Rivets: Often larger and made of stronger alloys, used in heavy-duty applications like aircraft or bridges.
The primary goal when you drill out a rivet is to remove its head, which then allows the shank to be pushed or pulled out.
Step-by-Step Guide to Drilling Out a Rivet
This section provides a detailed, step-by-step approach to effectively and safely drill out a rivet.
Step 1: Assess the Rivet and Surrounding Material
Before you start drilling, take a moment to look at the rivet and the material it’s holding together.
- Rivet Size: Is it a small, delicate rivet or a large, robust one? This will influence your drill bit choice and the force you apply.
- Material Thickness: How thick is the material? Thicker materials might require more drilling time and potentially a pilot hole.
- Material Type: Is it aluminum, steel, or something else? Steel rivets will be harder to drill than aluminum ones.
- Accessibility: Can you easily get to the rivet head and the opposite side (if necessary)?
Step 2: Safety First! Equip Yourself
This cannot be stressed enough. Always prioritize safety.
- Wear Safety Glasses/Goggles: Metal shards can fly at high speeds.
- Wear Gloves: Protect your hands from sharp edges and heat.
- Ensure Good Lighting: You need to see exactly what you’re doing.
- Secure the Workpiece: If possible, clamp the material you are working on to prevent movement.
Step 3: Mark the Center of the Rivet Head
Creating a pilot mark is essential for accurate drilling.
- Position the Center Punch: Place the sharp point of the center punch directly on the center of the rivet head.
- Tap with a Hammer: Gently but firmly tap the end of the center punch with a hammer. You don’t need to create a deep indentation, just enough to create a small dimple or mark. This dimple will guide the tip of your drill bit and prevent it from skating across the surface.
Step 4: Select the Correct Drill Bit Size
Choosing the right drill bit size is critical for successful rivet removal. The goal is to drill out the head of the rivet without damaging the surrounding material.
- General Rule: You want a drill bit that is slightly larger than the shank of the rivet but smaller than the diameter of the rivet head.
- Measuring:
- If the rivet head is intact: Use a caliper or ruler to measure the diameter of the rivet shank (the part that goes through the material).
- If the rivet head is damaged or broken: You may need to estimate or look up common rivet sizes for the application you’re working with. Often, a drill bit that is close to the diameter of the rivet body will work.
- Common Drill Bit Sizes for Rivets:
- For smaller rivets (e.g., 1/8″ or 3mm), you might start with a 1/8″ or slightly larger drill bit.
- For larger rivets (e.g., 3/16″ or 4.8mm), a 3/16″ or 7/32″ (5.5mm) bit might be appropriate.
- Starting Small: If you’re unsure, it’s often safer to start with a slightly smaller drill bit and gradually increase the size if needed. This minimizes the risk of over-drilling and damaging the parent material.
Table: Recommended Drill Bit Sizes (Approximate)
| Rivet Shank Diameter | Recommended Drill Bit Diameter |
|---|---|
| 1/8″ (3.175 mm) | 1/8″ to 9/64″ (3.175 to 3.57 mm) |
| 3/16″ (4.7625 mm) | 3/16″ to 13/64″ (4.7625 to 5.16 mm) |
| 1/4″ (6.35 mm) | 1/4″ to 17/64″ (6.35 to 6.75 mm) |
Note: These are general guidelines. Always measure the actual rivet shank for the best fit.
Step 5: Begin Drilling – The Rivet Head Removal Technique
This is where the actual rivet drilling technique comes into play.
- Set Your Drill:
- Speed: Use a medium to high speed for most metal drilling. However, if you’re drilling into a softer metal like aluminum, a higher speed is fine. For harder metals like steel, a slightly slower speed with more pressure can be more effective.
- Direction: Ensure your drill is set to rotate in a counter-clockwise direction (if you’re right-handed, this is typically how you would hold the drill to tighten a screw, but for drilling out a rivet head, you want to spin it counter-clockwise relative to your position, which will effectively be clockwise when looking at the drill motor itself, to cut). Correction: For most standard drills, setting it to “forward” or “clockwise” rotation is correct for drilling. This is crucial for cutting material. If you drill in reverse, you’ll likely just spin on the rivet head.
- Drill the Rivet Head:
- Place the tip of the drill bit into the dimple you created with the center punch.
- Apply steady, even pressure. Let the drill bit do the work.
- As the drill bit begins to cut, you should see shavings (swarf) forming.
- Drill just deep enough to remove the head of the rivet. You do not need to drill through the entire length of the rivet shank at this stage. The goal is to create a flat surface where the head used to be.
- Periodically clear debris. Use a wire brush or an air compressor with a blow gun to remove metal shavings from the drill bit and the work area. This prevents the bit from overheating and allows you to see your progress.
Step 6: Remove the Remaining Rivet Shank
Once the head is off, the shank should be loose.
- Gently Tap: Sometimes, the remaining shank will fall out on its own or with a gentle tap from a hammer.
- Use a Punch or Nail Set: If the shank is still in place, place the tip of a punch or a nail set against the center of the remaining rivet shank.
- Tap with a Hammer: Lightly tap the punch with a hammer. This will help drive the shank out of the hole. You might need to tap from one side to encourage it to pop out the other.
- Consider a Rivet Extraction Tool: For some blind rivets, after the head is drilled off, the mandrel might still be partially inside. A specialized rivet extraction tool or even a sturdy nail can be used to push out the remaining internal mandrel.
Step 7: Clean Up the Hole
After the rivet is successfully removed, you’ll need to clean up the hole.
- Wire Brush: Use a wire brush to remove any remaining burrs or metal fragments from the edges of the hole.
- Inspect: Check the hole for any damage to the surrounding material. If there are minor burrs, they can often be smoothed out with a deburring tool or fine-grit sandpaper.
Troubleshooting Common Issues During Rivet Removal
Even with careful preparation, you might encounter challenges. Here’s how to address them:
Issue: Drill Bit Spinning on the Rivet Head
- Cause: The center punch mark wasn’t deep enough, or the drill bit is dull.
- Solution: Re-center punch the rivet head with a deeper dimple. Ensure your drill bit is sharp and of good quality. If the bit is dull, replace it.
Issue: Over-drilling and Damaging the Material
- Cause: Applying too much pressure, using a drill bit that is too large, or drilling too deep.
- Solution: Use a drill bit size that is just slightly larger than the rivet shank. Apply steady, controlled pressure and stop drilling as soon as the rivet head is removed. If you have a drill with a depth stop feature, it can be helpful.
Issue: Drill Bit Getting Stuck
- Cause: The metal is particularly hard, or the bit is overheating.
- Solution: Apply a cutting fluid or lubricant. Reduce drilling speed slightly and apply more frequent pauses to allow the bit to cool. Ensure you are clearing swarf regularly.
Issue: Rivet Shank Not Budging
- Cause: The rivet is corroded, or it’s a very tight fit.
- Solution: Apply penetrating oil around the rivet shank and let it sit for a while. You might need to gently tap the surrounding material to help loosen it. If the shank is truly stubborn, you may need to try a slightly larger drill bit to cleanly cut the shank itself, or carefully use a punch to drive it out.
Issue: Drilling Out a Broken Rivet
- Cause: The head of the rivet snapped off, leaving the shank in place.
- Solution: This is a common scenario. You’ll need to determine the approximate diameter of the rivet shank. Then, drill out the remaining shank material. You might need to drill through the entire shank if the head broke flush or below the surface. Start with a pilot hole in the center of the remaining shank and then use a drill bit that is slightly smaller than the hole itself to clean out the material without damaging the hole’s edges. This is a form of rivet extraction where the goal is to remove the remaining body.
Advanced Techniques and Power Tool Rivet Removal
For frequent rivet removal or larger projects, specialized tools can make the job much easier.
Using a Rivet Head Removal Tool
Some tools are specifically designed to shave off rivet heads. These often have a fluted, conical shape that fits over the rivet head. As you drill, the tool cuts away the head. These can be very effective for specific rivet types and can help prevent over-drilling.
Power Tool Rivet Removal Systems
There are power tool attachments designed specifically for rivet removal. These often work by counter-boring the rivet head, effectively scooping it out. They can significantly speed up the process, especially when dealing with many rivets.
What is the Correct Drill Bit Size for a Rivet?
As detailed in Step 4, the correct drill bit size for a rivet is typically a bit that is slightly larger than the diameter of the rivet shank but smaller than the diameter of the rivet head. Measuring the shank and selecting a bit that’s a fraction of an inch or millimeter larger is the most common and effective approach for clean rivet head removal.
Can I Use a Drill Bit That’s Too Big?
While you can use a drill bit that’s too big, it’s not recommended. A drill bit that is too large will remove more material than necessary. This can enlarge the hole beyond its original size, potentially compromising the integrity of the joint or requiring you to use a larger rivet or other fastening method to repair it. It’s always best to start with a smaller bit and increase size incrementally if needed.
Conclusion: Mastering Rivet Drilling
Drilling out a rivet is a skill that improves with practice. By following these steps, using the right tools, and prioritizing safety, you can effectively remove rivets for a variety of repair and fabrication tasks. Remember to work methodically, be patient, and always protect yourself. With this comprehensive guide, you’re well-equipped to tackle rivet removal with confidence.
Frequently Asked Questions (FAQ)
Q1: How do I remove a rivet without a drill?
Removing a rivet without a drill is significantly more challenging and time-consuming. For solid rivets, you might be able to use a sharp chisel and hammer to carefully shear off the rivet head. This is a less precise method and carries a higher risk of damaging the surrounding material. For blind rivets, this is generally not feasible.
Q2: What if the rivet head is stripped and I can’t center punch it?
If the rivet head is too damaged to get a clean center punch mark, you might try using a pair of locking pliers (like Vise-Grips) to grip the head firmly and then attempt to drill. If this doesn’t work, you may need to try to carefully grind a small flat spot on the most accessible part of the head with a grinding tool or file, and then use that as your center punch point.
Q3: How do I drill out a rivet in a tight spot?
For tight spots, you might need to use an angle drill attachment for your drill or a right-angle grinder with a small grinding bit to remove the head. A smaller, more maneuverable drill might also be necessary. Access is key, so sometimes you may need to disassemble other components to get to the rivet.
Q4: Do I need to replace the rivet after drilling it out?
Yes, if the joint needs to be secured again, you will need to replace the rivet with a new one of the same size and type. If the hole has been slightly enlarged, you might need to use a slightly larger diameter rivet or a rivet designed to fit an oversized hole.
Q5: Can I drill out any type of rivet?
While the drilling method is common for most rivets, especially solid and blind rivets, some highly specialized or structural rivets in critical applications might have specific removal procedures recommended by the manufacturer. However, for general DIY and repair work, drilling is the standard method for rivet removal.
Q6: How do I know if I’ve drilled enough to remove the rivet head?
You’ve drilled enough when the central part of the rivet head detaches from the shank, or when you can clearly see the entire head separate from the rest of the rivet. You should then be able to push the remaining shank out with a punch or it might fall out on its own. Avoid drilling deeper than the thickness of the rivet head.