When it comes to removing broken bolts and studs, it can be a frustrating and time-consuming task. However, with the right techniques and products, you can make the process much easier and more efficient. One technique that has gained popularity among professionals is the use of left-handed drill bits. In this blog post, we will explore the benefits of using left-handed drill bits and provide you with the proper way to use them.
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What are left-handed drill bits?
Left-handed drill bits are designed to rotate in the opposite direction of traditional right-handed drill bits. This means that as the left-handed drill bit is drilling into the broken bolt or stud, it is also applying a counterclockwise force. This counterclockwise force can help to loosen the bolt or stud, making it easier to remove. Plus, most extractor tools require a hole to be drilled in the bolt or stud first, so why not use a left-handed drill bit. More times than not, I've had the broken bolt or stud spin right out when drilling.
Benefits of using left-handed drill bits
There are several benefits to using left-handed drill bits for removing broken bolts and studs:
- Loosening effect: Mentioned above the counterclockwise force applied by the left-handed drill bit can help to loosen the bolt or stud, making it easier to remove.
- Reduced risk of damage: Left-handed drill bits have a reduced risk of damaging the surrounding material compared to other extraction methods, such as using an extractor set. Extractors apply outward force and in a lot of cases damage the threads that the bolt or stud are being removed from.
- Time-saving: Left-handed drill bits can save you time by combining the drilling and extraction processes into one step.
- Versatility: Left-handed drill bits can be used on a wide range of materials, including metal, wood, and plastic.
- Cost-effective: Left-handed drill bits are a cost-effective solution for removing broken bolts and studs, as they eliminate the need for expensive extraction tools. My personal choice is Irwin. One reason is that over the years I've noticed that more and more of their products are made in the USA. This is a good little cobalt set, but it was out of stock at the time I posted this blog. https://amzn.to/46ile1k
Proper way to use left-handed drill bits
To effectively use left-handed drill bits for removing broken bolts and studs, follow these steps:
- Select the appropriate drill bit size: Choose a left-handed drill bit that is slightly smaller than the diameter of the broken bolt or stud. https://amzn.to/49CVe3F
- Secure and prepare the workpiece: If needed use clamps or a vise to secure the workpiece in place. Self-centering drill bits are the best way to go. Otherwise using a center punch will help you get the drill bit started in the center of the broken bolt or stud. https://amzn.to/3MGB2nn In some cases, if it was not a clean break you may need to grind a flat spot to help center the drill bit.
- Apply cutting fluid: Apply cutting fluid to the broken bolt or stud to reduce friction and heat. https://amzn.to/47wFGMY I recommend cutting fluid be used for all drilling jobs that involve metals. It is also wise to presoak the broken bolt or stud with a good penetrating oil like PB Blaster. https://amzn.to/49CWXWr
- Drill in reverse: Set your drill to reverse mode and slowly drill into the broken bolt or stud using the left-handed drill bit. I find that battery operated drills give you more control to maintain a slow speed.
- Monitor for signs of extraction: As you drill, keep an eye out for signs that the bolt or stud is being extracted, such as increased resistance or movement. If possible scratching lines on the extruding remaining part of the bolt or stud can give you a visual reference point.
- Remove the bolt or stud: Once the bolt or stud is extracted, use pliers or a wrench to remove it from the workpiece. https://amzn.to/40zrjFp
In conclusion, using left-handed drill bits can be a highly effective and fast technique for removing broken bolts and studs. https://amzn.to/47wFGMY
Their counterclockwise force and other benefits make them a valuable tool for professionals and DIY enthusiasts alike. By following the proper steps and using the right drill bit size, you can save time and effort in the bolt and stud removal process.
Consider investing in a quality set of left-handed drill bits https://amzn.to/46c3BAi and extractor sets https://amzn.to/3ugwb to have on hand for any future projects that require bolt or stud removal.
My name is Tim Tadlock and I've been in the tool and fastener business for over 30 years. I hope you enjoyed this blog post and that it has been helpful to you in some way.
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