Jobber Drill Bits

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Jobber drill bits are a type of twist drill bit commonly used in drilling holes in various materials, including wood, metal, plastic, and more. These drill bits are a fundamental tool in many workshops, construction sites, and DIY projects. Here's what you need to know about jobber drill bits:

1. Design: Jobber drill bits have a straight shank with a uniform diameter along the entire length of the bit. They are designed for general-purpose drilling and are often used with handheld power drills or drill presses.

2. Length: Jobber drill bits are typically of standard or "jobber" length, which means they are longer than stubby bits but shorter than extra-long or aircraft-length bits.The standard length provides a balance between reach and rigidity.

3. Materials: Jobber drill bits are available in various materials, including high-speed steel (HSS) and cobalt steel. HSS bits are suitable for drilling softer materials like wood and mild steel, while cobalt bits are more durable and heat-resistant, making them suitable for harder materials such as stainless steel and cast iron.

4. Coatings: Some jobber drill bits may feature coatings like titanium nitride (TiN) or black oxide. These coatings enhance the durability and heat resistance of the bit, reduce friction, and prolong the bit's lifespan.

5. Point Angles: Jobber drill bits come in different point angles, with the most common being 118 degrees and 135 degrees. The choice of point angle depends on the material being drilled. The 118-degree point angle is suitable for general-purpose drilling, while the 135-degree point angle is better for harder materials.

6. Versatility: Jobber drill bits are versatile and can be used for drilling holes in a wide range of materials, making them a go-to choice for many drilling applications.

7. Drilling Techniques: When using jobber drill bits, it's essential to use the correct drilling technique, which includes applying consistent pressure, using proper lubrication or cooling for metal drilling, and maintaining the correct drill speed for the material being drilled.

8. Sizes: Jobber drill bits come in various sizes, typically specified in fractions of an inch or in metric units. The size of the drill bit determines the diameter of the hole it will create.

9. Storage: Proper storage is essential to keep jobber drill bits in good condition. Many people use drill bit indexes or storage cases to organize and protect their bits.

10. Safety: Safety precautions, such as wearing appropriate eye protection and work gloves, should be taken when using jobber drill bits to prevent accidents or injury.

In summary, jobber drill bits are a commonly used type of twist drill bit with a straight shank and standard length. They are versatile tools suitable for a wide range of drilling tasks, and their choice of material and point angle should be matched to the specific application to achieve optimal results.