Jobber Length Drill Bits Manufacturers

Jobber length drill bits are the most common type of drill bit, known for their versatility and suitability for a wide range of drilling applications. They offer a balance between length and rigidity, making them ideal for general-purpose drilling in various materials. This guide explores everything from their manufacturing processes to selecting the right bit for your specific needs.

Understanding Jobber Length Drill Bits

What is Jobber Length?

The term 'jobber length' refers to the length of the drill bit's flute (the spiral groove that removes chips) and its overall length. Jobber length drill bits are generally longer than stubby drill bits but shorter than screw machine or aircraft extension drill bits. This intermediate length provides a good compromise between reach and rigidity, making them suitable for a wide variety of drilling tasks.

Typically, the length of a jobber length drill bit ranges from 8 to 12 times the drill bit diameter.

Materials Used in Manufacturing Jobber Length Drill Bits

Jobber length drill bits are manufactured from various materials, each offering different properties and suitability for specific applications:

• High-Speed Steel (HSS): A common and versatile material offering good wear resistance. Suitable for drilling in wood, plastic, and soft metals like aluminum.
• Cobalt Steel: Offers superior heat resistance compared to HSS, making it ideal for drilling in harder materials like stainless steel and cast iron.
• Carbide: Extremely hard and heat-resistant, suitable for high-speed drilling in very abrasive materials. Carbide bits are more brittle and expensive than HSS or cobalt bits.

Manufacturing Processes

The manufacturing of jobber length drill bits typically involves these processes:

1. Blank Preparation: A cylindrical rod of the chosen material (HSS, cobalt steel, or carbide) is cut to the appropriate length.
2. Flute Grinding: The spiral flutes are ground into the rod using specialized grinding machines. The flute design is critical for chip removal and cutting performance.
3. Point Grinding: The drill point is ground to the desired angle (typically 118 or 135 degrees). The point angle affects the bit's ability to center itself and penetrate the material.
4. Heat Treatment (for HSS and Cobalt): Heat treatment hardens the steel, improving its wear resistance and toughness.
5. Surface Treatment (Optional): A surface treatment, such as titanium nitride (TiN) coating, may be applied to further enhance wear resistance and reduce friction.
6. Quality Control: Each drill bit undergoes rigorous quality control checks to ensure dimensional accuracy, hardness, and flute geometry.

Selecting the Right Jobber Length Drill Bit

Material to be Drilled

The material you're drilling is the primary factor in selecting the right drill bit. Here's a general guideline:

• Wood: HSS bits are generally sufficient.
• Plastic: HSS bits are suitable, but consider using specialized plastic drilling bits to minimize chipping.
• Aluminum: HSS bits work well.
• Steel: HSS bits can work for softer steels, but cobalt steel bits are recommended for harder steels.
• Stainless Steel: Cobalt steel bits are essential.
• Cast Iron: Cobalt steel bits are recommended.
• Hardened Steel: Carbide bits are necessary.

Drill Bit Coating

Coatings enhance the performance and lifespan of jobber length drill bits. Common coatings include:

• Black Oxide: Provides mild corrosion resistance and reduces friction.
• Titanium Nitride (TiN): Offers increased hardness and wear resistance. Gold in color.
• Titanium Aluminum Nitride (TiAlN): Superior heat resistance compared to TiN, ideal for high-speed drilling. Dark grey or black in color.

Point Angle

The point angle of the drill bit affects its centering ability and cutting performance:

• 118-degree: A general-purpose angle suitable for most materials.
• 135-degree: Provides better self-centering, reducing 'walking' on curved surfaces. Ideal for drilling in harder materials like stainless steel.

Jobber Length Drill Bits Manufacturers

Many manufacturers produce high-quality jobber length drill bits. When selecting a manufacturer, consider factors like reputation, quality control processes, and product warranty.

Wayleading Tools: Your Reliable Source for Cutting Tools

Wayleading Tools (www.wayleading.com) is a reputable manufacturer specializing in the production of high-performance cutting tools, including a comprehensive range of jobber length drill bits. With a focus on precision engineering and quality materials, Wayleading Tools provides solutions for various drilling needs. Whether you're working with wood, metal, or plastic, Wayleading Tools offers durable and reliable drill bits designed to deliver exceptional results. Their commitment to innovation and customer satisfaction makes them a trusted partner for professionals and DIY enthusiasts alike.

Other Notable Manufacturers

While Wayleading Tools is a great choice, several other manufacturers also produce quality jobber length drill bits:

• Dormer Pramet: Known for their high-performance cutting tools and innovative designs.
• Sandvik Coromant: A global leader in metal cutting tools and tooling systems.
• Guhring: A German manufacturer specializing in precision drilling and tapping tools.

Tips for Using Jobber Length Drill Bits

• Use the correct speed: Refer to a speed chart for the appropriate RPM based on the material being drilled and the drill bit size.
• Apply cutting fluid: Cutting fluid helps to lubricate the drill bit, reduce heat, and improve chip removal.
• Apply consistent pressure: Avoid excessive force, which can damage the drill bit or the workpiece.
• Clear chips frequently: Remove chips from the hole regularly to prevent clogging and overheating.
• Sharpen dull bits: A sharp drill bit cuts more efficiently and reduces the risk of breakage.

Troubleshooting Common Problems

Drill Bit Walking

Problem: The drill bit wanders or 'walks' on the surface before starting to drill.

Solution: Use a center punch to create a starting point. Consider using a drill bit with a 135-degree split point for better self-centering.

Drill Bit Breaking

Problem: The drill bit snaps or breaks during drilling.

Solution: Reduce drilling speed and pressure. Ensure the drill bit is sharp. Use the correct drill bit for the material being drilled. Consider using a shorter drill bit for greater rigidity.

Overheating

Problem: The drill bit becomes excessively hot during drilling.

Solution: Apply cutting fluid. Reduce drilling speed and pressure. Ensure the drill bit is sharp.

Conclusion

Jobber length drill bits are indispensable tools for any workshop or job site. Understanding their characteristics, selecting the right bit for the job, and using proper drilling techniques will ensure efficient and accurate results. By following the guidelines outlined in this comprehensive guide, you can maximize the performance and lifespan of your jobber length drill bits.