Understanding Jobber Drill Bits: A Comprehensive Guide
Drilling holes is a common task in many industries and DIY projects, and having the right drill bit can make a world of difference. One type of drill bit that is widely used is the jobber drill bit. In this comprehensive guide, we will explore what jobber drill bits are, how they work, and the different types available.
Jobber drill bits are a type of twist drill bit that are designed for general-purpose drilling. They are typically made from high-speed steel and come in a range of diameters and lengths to accommodate different drilling needs. The name “jobber” comes from the term “jobbing engineer,” which refers to a craftsman who works on various tasks or jobs.
One of the key features of jobber drill bits is their length. They are longer than standard drill bits, which allows them to drill deeper holes without the need for frequent bit changes. This makes them ideal for drilling into various materials, including wood, metal, and plastic. Additionally, jobber drill bits have a 118-degree point angle, which helps to reduce the risk of the bit wandering or slipping while drilling.
There are several types of jobber drill bits, each designed for specific materials and drilling tasks. High-speed steel (HSS) jobber drill bits are the most common and can be used for a wide range of applications. Cobalt jobber drill bits, on the other hand, are made from a mixture of cobalt and high-speed steel and are ideal for drilling into tough materials such as stainless steel and cast iron. For more precise drilling, you can opt for carbide jobber drill bits, which are extremely hard and durable.
Overall, jobber drill bits are versatile tools that are essential for any drilling project. Whether you are a professional tradesperson or a DIY enthusiast, having a set of jobber drill bits in your toolkit will ensure that you have the right tool for the job.
What are Jobber Drill Bits?
Jobber drill bits are a type of twist drill bit that are commonly used in general-purpose drilling applications. They are designed to be versatile and can be used on a wide range of materials, including wood, metal, plastic, and composites.
Jobber drill bits are characterized by their length, which is typically longer than other types of drill bits. The length of a jobber drill bit is generally between 8 to 12 times the diameter of the bit. This extra length allows for deeper hole drilling and makes them suitable for a variety of drilling tasks.
Features of Jobber Drill Bits:
- Point Angle: Jobber drill bits typically have a point angle of 118 degrees. This angle provides a good balance between the cutting action and the strength of the bit.
- Flute Design: Jobber drill bits usually have a standard flute design, with spiral grooves running along the length of the bit. This design helps to remove chips and debris from the hole as the bit cuts through the material.
- Material: Jobber drill bits are commonly made from high-speed steel (HSS). HSS is a durable and heat-resistant material that can withstand the high temperatures generated during drilling. Some jobber drill bits may also be coated with a layer of titanium nitride (TiN) or other coatings to increase their hardness and extend their lifespan.
Advantages of Jobber Drill Bits:
- Versatility: Jobber drill bits can be used on a wide range of materials, making them a versatile choice for various drilling tasks.
- Longer Length: The longer length of jobber drill bits allows for deeper hole drilling, making them suitable for applications where a deeper hole is required.
- Durable: Jobber drill bits are typically made from high-speed steel, which is a durable material that can withstand the rigors of drilling.
- Economical: Jobber drill bits are relatively affordable compared to specialized drill bits, making them a cost-effective option for general drilling needs.
In conclusion, jobber drill bits are a versatile and durable option for general-purpose drilling applications. Their longer length and durable construction make them suitable for a wide range of materials and drilling tasks. Whether you are drilling into wood, metal, plastic, or composites, jobber drill bits are a reliable choice.
Types and Sizes of Jobber Drill Bits
Jobber drill bits are available in various types and sizes to suit different drilling needs. Here are some of the commonly used types and their corresponding sizes:
1. Standard Jobber Drill Bits
Standard jobber drill bits are the most common type used for general-purpose drilling. They have a medium-length flute and a 118° point angle. They are available in sizes ranging from 1/16 inch to 1 inch.
2. Cobalt Jobber Drill Bits
Cobalt jobber drill bits are made from high-speed steel with added cobalt for increased heat resistance and durability. They are suitable for drilling hard metals such as stainless steel and cast iron. Cobalt jobber drill bits are available in sizes ranging from 1/16 inch to 1/2 inch.
3. Titanium Jobber Drill Bits
Titanium jobber drill bits have a titanium nitride coating that provides increased hardness and heat resistance. They are ideal for drilling wood, plastic, and softer metals. Titanium jobber drill bits are available in sizes ranging from 1/16 inch to 1/2 inch.
4. Concrete Jobber Drill Bits
Concrete jobber drill bits, also known as masonry drill bits, have a carbide tip for drilling through concrete, stone, brick, and tile. They are available in sizes ranging from 1/8 inch to 1/2 inch.
5. Step Drill Bits
Step drill bits have a conical shape with multiple stepped sizes. They are used for enlarging holes or creating holes in thin materials. Step drill bits are available in various sizes with each bit having multiple steps.
It’s important to select the right type and size of jobber drill bit for your specific drilling application to ensure optimal performance and accurate results.
High-Speed Steel (HSS) Drill Bits
High-Speed Steel (HSS) drill bits are the most common and widely used drill bits in various applications. They are made from a type of tool steel called high-speed steel, which contains elements like tungsten, molybdenum, chromium, and vanadium. The combination of these elements gives HSS drill bits their high resistance to heat and wear.
HSS drill bits are known for their ability to drill into a wide range of materials, including wood, metal, plastic, and composites. They are versatile and can be used with hand drills, drill presses, and CNC machines.
One of the advantages of HSS drill bits is their ability to maintain their hardness even at high temperatures. This makes them suitable for drilling into materials that generate a lot of heat during the drilling process, such as stainless steel and hardened metals. HSS drill bits can also withstand high drilling speeds, making them ideal for quick and efficient drilling operations.
Another benefit of HSS drill bits is their durability. They have excellent resistance to wear and can last longer compared to other types of drill bits. This makes them a cost-effective choice for high-volume drilling tasks.
HSS drill bits come in a variety of sizes, ranging from small diameter bits for delicate tasks to larger diameter bits for heavy-duty applications. They typically have a cylindrical shank and a helical flute design, which helps to remove chips and debris from the hole.
When using HSS drill bits, it is important to use lubrication or cutting fluid to reduce heat and prolong the life of the bit. Additionally, using a center punch to create a starting point or pilot hole can help to prevent the bit from wandering and ensure precise drilling.
Overall, HSS drill bits are a reliable and versatile choice for a wide range of drilling applications. They offer excellent heat resistance, durability, and compatibility with various materials, making them a go-to option for professionals and DIY enthusiasts alike.
Cobalt Drill Bits
Cobalt drill bits are a type of drill bit made from a high-speed steel alloy that contains a high percentage of cobalt. This alloy gives cobalt drill bits superior hardness, heat resistance, and durability compared to standard high-speed steel drill bits. Cobalt drill bits are commonly used for drilling through hard materials such as stainless steel, cast iron, and other alloys.
Advantages of Cobalt Drill Bits
- Hardness: Cobalt drill bits are significantly harder than standard high-speed steel drill bits, allowing them to maintain their cutting edge for longer durations. This hardness makes them ideal for heavy-duty drilling applications.
- Heat Resistance: The cobalt alloy used in these drill bits has a higher melting point than standard high-speed steel, which means they can withstand higher drilling speeds without becoming overheated. This heat resistance helps to prolong the life of the drill bit.
- Durability: Due to their hardness and heat resistance, cobalt drill bits are extremely durable and can withstand the demands of high-speed drilling in tough materials.
Common Uses of Cobalt Drill Bits
Cobalt drill bits are commonly used in various applications where drilling through hard materials is required. Some common uses include:
- Drilling through stainless steel or other metals
- Drilling through cast iron or other tough alloys
- Drilling in high-speed drilling applications
- Drilling in industrial settings
Tips for Using Cobalt Drill Bits
Here are some tips to keep in mind when using cobalt drill bits:
- Use a proper cutting fluid or lubricant when drilling to reduce heat buildup and prolong the life of the drill bit.
- Ensure the drill bit’s cutting edges are sharp and in good condition before each use.
- Set the drill to the appropriate speed for the material being drilled. Cobalt drill bits can handle higher speeds compared to standard drill bits.
- Apply steady pressure while drilling to avoid excessive heat buildup and prevent the drill bit from wandering off course.
Conclusion
Cobalt drill bits are a durable and heat-resistant option for drilling through hard materials such as stainless steel and alloys. Their superior hardness and longevity make them a popular choice for heavy-duty drilling applications. By following proper drilling techniques and maintenance, cobalt drill bits can provide reliable performance and longevity.
Masonry Drill Bits
Masonry drill bits are specifically designed for drilling into materials such as concrete, brick, stone, and tile. These materials are known for their hardness and strength, so regular drill bits may not be able to penetrate them effectively. Masonry drill bits have a special tungsten carbide tip that is able to withstand the high heat and pressure generated during drilling.
There are several types of masonry drill bits, including:
- Twist Bits: These are the most common type of masonry drill bits. They have a spiral shape with grooves that help remove debris while drilling. Twist bits are suitable for drilling smaller holes in masonry materials.
- SDS Bits: These are specialized masonry drill bits that are designed to be used with SDS (Slotted Drive System) rotary hammers. They have a special shank that allows for rapid and powerful drilling in masonry materials.
- Core Bits: These drill bits are used for drilling large-diameter holes in masonry materials. They are typically hollow, allowing for the removal of a core of material. Core bits are commonly used in plumbing and electrical installations.
In addition to the type of drill bit, the size of the drill bit is also an important consideration when drilling into masonry materials. The size of the hole needed will determine the size of the drill bit required. It is important to choose a drill bit that is suited to the specific task at hand to ensure accurate and efficient drilling.
| Size | Common Uses |
|---|---|
| 1/8″ – 1/4″ | Drilling small holes for screws or anchors |
| 3/8″ – 1/2″ | General-purpose drilling in masonry materials |
| 5/8″ – 1″ | Drilling holes for larger fasteners or pipes |
| 1 1/4″ and larger | Drilling large-diameter holes for plumbing or electrical installations |
When using masonry drill bits, it is important to use them at the correct speed and with proper technique. High speeds can cause the drill bit to overheat and become less effective, while low speeds may cause the drill bit to become stuck or break. It is also important to apply steady pressure while drilling and to periodically withdraw the drill bit to clear away debris.
In summary, masonry drill bits are essential tools for drilling into hard and durable materials such as concrete, brick, stone, and tile. By choosing the right type and size of drill bit, and using them correctly, you can achieve precise and efficient drilling results in masonry materials.
Wood Drill Bits
Wood drill bits are designed specifically for drilling into wood materials. They feature a pointed tip and a fluted body that helps to remove wood chips as the bit rotates.
Type of Wood Drill Bits
There are several types of wood drill bits available, including:
- Twist Drill Bits: These are the most common type of wood drill bits. They have a twisted design that helps to remove material as they penetrate the wood.
- Spade Bits: These are flat, paddle-shaped drill bits that are commonly used for drilling larger holes in wood. They are often used for rough drilling tasks and are great for creating holes for plumbing or electrical work.
- Forstner Bits: These bits are used for drilling clean, flat-bottom holes in wood. They are often used for creating holes for dowels, as well as for hinge and latch installations.
- Auger Bits: Auger bits are designed for drilling deep holes in wood. They have a threaded screw tip and cutting edges that help to remove the wood as they drill.
- Spur Point Bits: These bits have a central point and spurs that help to create clean, precise holes in wood. They are often used for drilling holes for dowels, as well as for general woodworking tasks.
Choosing the Right Wood Drill Bit
When choosing a wood drill bit, consider the type of wood you will be drilling into, as well as the size of the hole you need to create. For softer woods, such as pine or cedar, a twist drill bit is usually sufficient. For harder woods, such as oak or maple, a spade or auger bit may be more appropriate.
It’s also important to consider the size of the hole you need to create. Wood drill bits are available in a range of sizes, so be sure to choose a bit that matches the diameter of the hole you need.
Using Wood Drill Bits Safely
When using wood drill bits, it’s important to follow proper safety guidelines:
- Wear protective goggles to protect your eyes from flying wood chips.
- Secure the wood firmly in place before drilling to prevent it from slipping.
- Use a drilling guide or template to ensure accurate hole placement.
- Start drilling at a slow speed to prevent the bit from wandering.
- Clear away wood chips regularly to prevent them from clogging the flutes.
- Avoid applying excessive pressure as this can cause the bit to overheat and dull quickly.
- Always unplug or turn off the power tool when changing drill bits.
By following these safety precautions, you can ensure a safe and successful drilling experience with wood drill bits.
Extra-Long Drill Bits
Extra-long drill bits, as the name suggests, are drill bits that are longer than standard drill bits. They are designed for drilling holes in deep or hard-to-reach areas where regular drill bits cannot reach. These bits are commonly used in construction, woodworking, and metalworking industries.
Features and Benefits
Extra-long drill bits have several features and benefits that make them ideal for certain applications. Some of the key features and benefits include:
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Extended Length: Extra-long drill bits are available in lengths ranging from 12 inches to 48 inches or even longer. This extended length allows users to drill holes in deep or hard-to-reach areas without the need for additional tools or equipment.
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Versatility: Extra-long drill bits can be used in a variety of materials, including wood, metal, plastic, and composites. This versatility makes them useful for a wide range of applications, such as drilling holes for electrical wiring, plumbing, or installation of hardware.
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Precision: Extra-long drill bits are designed to provide precise and accurate drilling. They are often made from high-quality materials, such as high-speed steel or cobalt, which ensures durability and longevity.
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Flexibility: Extra-long drill bits are generally flexible, allowing users to easily navigate around obstacles and drill holes at various angles. This flexibility is especially useful when working in tight or confined spaces.
Types of Extra-Long Drill Bits
There are several types of extra-long drill bits available on the market to suit different applications. Some of the common types include:
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Twist Drill Bits: These are the most common type of drill bits and are suitable for general drilling tasks. They have a cylindrical shank and a spiral flute to remove chips and debris from the hole.
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Spade Drill Bits: Also known as paddle drill bits, these have a flat, spade-shaped tip and are used for drilling large holes in wood or soft materials.
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Auger Drill Bits: These bits have a screw-like design and are used for drilling larger diameter holes in wood or soft materials.
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Masonry Drill Bits: These are designed specifically for drilling into concrete, brick, or stone. They have a carbide tip to withstand the hardness and abrasiveness of these materials.
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Forstner Drill Bits: These bits are used for drilling flat-bottomed holes, often used for woodworking and cabinetry.
Tips for Using Extra-Long Drill Bits
When working with extra-long drill bits, it is important to keep the following tips in mind:
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Use a drill press or stationary drill for better control and stability when drilling with extra-long drill bits.
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Secure the workpiece firmly to avoid any movement or vibrations that can affect drilling accuracy.
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Use cutting lubricant or coolant to reduce heat and extend the life of the drill bit.
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Take frequent breaks to allow the drill bit to cool down and prevent overheating.
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Wear appropriate safety gear, such as safety glasses and gloves, when using extra-long drill bits.
Conclusion
Extra-long drill bits are a valuable tool for drilling holes in deep or hard-to-reach areas. Their extended length and flexibility make them ideal for various applications in construction, woodworking, and metalworking industries. By understanding the features and benefits of extra-long drill bits, as well as following proper usage tips, users can maximize their effectiveness and achieve precise and accurate drilling results.
Choosing the Right Jobber Drill Bit
When it comes to selecting the right jobber drill bit, there are several factors to consider. The choice of the right drill bit can make a significant difference in the success of a drilling operation. Here are some important considerations to keep in mind:
1. Material Type
One of the most crucial factors to consider when choosing a jobber drill bit is the type of material you will be drilling. Different materials require different drill bits. For example, drilling through wood will require a different type of bit than drilling through metal. It is important to choose a drill bit that is specifically designed for the material you will be drilling to ensure the best results.
2. Bit Size
The size of the drill bit is another important consideration. The size of the hole you need to create will determine the size of the drill bit you should use. Jobber drill bits come in a variety of sizes, ranging from small diameters for delicate work to larger diameters for heavy-duty drilling. It is essential to choose a bit size that matches the requirements of your project.
3. Shank Type
Jobber drill bits come with different shank types, including straight shank and hex shank. The shank type determines the type of chuck that can be used to secure the drill bit. Straight shank drill bits are more common and can be used with a wide range of drilling machines. On the other hand, hex shank drill bits are designed for use with impact drivers and provide better security and grip.
4. Length
The length of the drill bit is another aspect to consider. Jobber drill bits are available in various lengths, including standard length and long length options. The length you choose will depend on the depth of the hole you need to drill. Standard length drill bits are suitable for most drilling applications, while long-length drill bits are ideal for drilling deeper holes.
5. Coating
Some jobber drill bits come with special coatings that can enhance their performance and durability. Coatings such as titanium nitride or black oxide can provide increased hardness and lubricity, resulting in improved chip evacuation and reduced friction. These coatings can also help extend the lifespan of the drill bit, making them a good choice for heavy-duty or prolonged drilling operations.
6. Quality
Lastly, it is important to consider the quality of the jobber drill bit. High-quality drill bits are made from durable materials and undergo rigorous heat treatment and manufacturing processes. They are designed to withstand high-speed drilling and provide consistent performance. Investing in a high-quality drill bit can lead to better results, longer tool life, and increased productivity.
By considering these factors and taking the time to choose the right jobber drill bit, you can ensure that your drilling projects are successful and efficient.
Understanding Drill Bit Sizes
When it comes to selecting the right drill bit for a specific job, one of the most important factors to consider is the size of the bit. Drill bit sizes can vary significantly and understanding how they are measured is crucial in order to ensure a successful drilling operation. In this section, we will delve into the details of drill bit sizes and how they are classified.
Drill Bit Size Classification
Drill bit sizes are typically classified using several metrics, including the diameter of the bit, the shank size, and the drill point angle. The diameter of the bit refers to the width or thickness of the drill bit. Shank size refers to the size of the shank, which is the non-cutting end of the drill bit that is inserted into the drill chuck. The drill point angle refers to the angle at the tip of the drill bit that determines the drilling performance.
Numbered and Fractional Drill Bit Sizes
Drill bit sizes are commonly available in numbered and fractional sizes. Numbered sizes range from 1 to 100, with smaller numbers indicating smaller diameters. Fractional sizes, on the other hand, are expressed as fractions of an inch and typically range from 1/16th of an inch to 1 inch. Both numbered and fractional sizes are widely used in various drilling applications.
Letter Sizes
In addition to numbered and fractional sizes, drill bits are also available in letter sizes. Letter sizes are designated by letters of the alphabet, ranging from A to Z. Each letter corresponds to a specific diameter, with A being the smallest and Z being the largest. Letter sizes are commonly used in industries such as metalworking and woodworking.
Wire Sizes
Wire sizes are another classification system for drill bits. Wire sizes are measured using a numerical system, with smaller numbers indicating larger diameters. Wire sizes are commonly used in electrical wiring and other applications that require precise hole sizes.
Conclusion
Understanding drill bit sizes is essential for selecting the right drill bit for any drilling project. Whether you are working with wood, metal, or other materials, knowing the diameter, shank size, and drill point angle of a drill bit will help ensure accurate and efficient drilling results.
Selecting the Appropriate Drill Bit Material
When it comes to selecting the right drill bit for your job, one of the most important factors to consider is the material of the drill bit itself. Different materials have different properties, and choosing the right material can greatly impact the performance and longevity of your drill bit.
High-Speed Steel (HSS)
High-speed steel (HSS) is one of the most common materials used for drill bits. It is a type of tool steel that contains a combination of carbon, tungsten, and other elements. HSS drill bits are known for their durability and ability to withstand high temperatures. They are suitable for use on a wide range of materials, including wood, plastic, and metal.
Pros:
- Durable and long-lasting
- Can be used on various materials
- Resistant to heat
Cons:
- Can be more expensive than other materials
- May require sharpening or regrinding over time
Cobalt
Cobalt drill bits are made from a high-speed steel alloy that contains a significant amount of cobalt. This alloy enhances the hardness and heat resistance of the drill bit, making it ideal for drilling through tough materials like stainless steel and cast iron.
Pros:
- Greater heat resistance than HSS
- More durable and longer-lasting
- Can be used on hard materials
Cons:
- More expensive than HSS drill bits
- May require cooling or lubrication during use
Carbide
Carbide drill bits are made from a composite material called cemented carbide, which consists of tungsten carbide particles embedded in a matrix of cobalt or another metal binder. These drill bits are extremely hard and are capable of drilling through even the toughest materials.
Pros:
- Very high hardness and wear resistance
- Can be used on hard materials like concrete and masonry
- Long life expectancy
Cons:
- Expensive
- Brittle and prone to breakage if not used properly
When selecting a drill bit material, it is important to consider the type of material you will be drilling, as well as the specific requirements of your job. By choosing the appropriate drill bit material, you can ensure better performance, longer lifespan, and more efficient drilling.
FAQ:
What are jobber drill bits used for?
Jobber drill bits are used for general purpose drilling in materials such as metal, wood, plastic, and composites.
What is the difference between a jobber length and a standard length drill bit?
The difference between a jobber length and a standard length drill bit is the length of the flute. Jobber drill bits have a longer flute length, which allows for deeper hole drilling, while standard length drill bits have a shorter flute length.
Are jobber drill bits made of different materials?
Yes, jobber drill bits are available in different materials such as high-speed steel (HSS), cobalt, and carbide. Each material has its own properties and is suitable for different drilling applications.
What is the recommended speed for using jobber drill bits?
The recommended speed for using jobber drill bits depends on the material being drilled. It is best to refer to the manufacturer’s guidelines or consult a drilling speed chart to determine the appropriate speed for your specific application.
Can jobber drill bits be used with a hand drill?
Yes, jobber drill bits can be used with a hand drill. However, it is important to use proper techniques and apply consistent pressure to ensure accurate and efficient drilling.
How can I prolong the life of my jobber drill bits?
To prolong the life of your jobber drill bits, it is important to use the appropriate cutting fluid or lubricant, maintain the correct drilling speed and feed rate, and regularly sharpen or replace worn-out bits.
What is the difference between a jobber drill bit and a twist drill bit?
A jobber drill bit is a type of twist drill bit that is specifically designed for general purpose drilling. While all jobber drill bits are twist drill bits, not all twist drill bits are jobber drill bits. Twist drill bits come in various lengths and styles, including jobber length, stub length, and long length, each with its own purpose.
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