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What are Twist Drill Bits

What are Twist Drill Bits

What are Twist Drill Bits

Twist drill bits are a type of cutting tool designed for drilling holes in various materials, most commonly in metal, wood, and plastic. They are one of the most widely used and versatile tools in the realm of machining and construction. The name "twist" refers to the helical shape of the flutes or grooves that run along the length of the drill bit.


Parts of Twist Drill Bits

1.Point (Tip): The leading end of the drill bit that makes contact with the material to be drilled. The point is typically ground to a specific angle depending on the material being drilled.

2.Flutes: The spiral grooves that run along the length of the drill bit. Flutes serve multiple purposes, including facilitating chip removal, cooling the bit during operation, and providing a path for the cutting edges.

3.Cutting Edges: The sharp edges along the sides of the point where the drilling action occurs. The number of cutting edges can vary, and each edge is responsible for cutting into the material as the bit rotates.

4.Shank: The shank is the opposite end of the drill bit from the point. It is the part that is inserted into the chuck of a drill or other drilling device. The shank can be straight or have a tapered design, depending on the size of the drill bit.

5.Helix Angle: The angle formed by the flutes' helical shape. The helix angle affects the chip removal process and is an essential factor in the drill bit's design.

6.Web: The central portion that connects the flutes. The thickness of the web influences the strength and rigidity of the drill bit.

7.Chisel Edge: The edge formed by the intersection of the point and the flute. It helps to guide the drill bit into the material and contributes to the cutting action.

Twist drill bits come in a wide range of sizes and materials, allowing them to be used for various applications. They are commonly used in hand drills, drill presses, and other drilling machinery. The selection of a specific twist drill bit depends on factors such as the material being drilled, the desired hole size, and the type of drilling equipment available.


Parts of Twist Drill Bits
Characteristics of Twist Drill Bits
Characteristics of Twist Drill Bits

The characteristics of a Twist drill bit are intricately tied to its design, with key considerations affecting chip angle, blade thickness, and chip removal performance. The spiral angle, a critical element, determines the chip angle at the cutting edge. Manufacturing processes such as milling, grinding, hot rolling, or hot extrusion are employed to create the helical groove. Post-sharpening, the front end of the drill bit is honed, forming a distinct cutting section.

In standard Twist drill bits, the tip angle of the cutting part and the chamfer angle of the chisel edge collectively contribute to the clearance angle. The design results in a chip angle that gradually decreases from the outer edge to the middle, with a negative cross-cutting edge. This configuration allows for left and right chip extrusion during drilling. To optimize cutting performance, the cutting part can be ground into various shapes tailored to the material being processed.


Hand Tools Supplier - SINOTOOLS
Hand Tools Supplier - SINOTOOLS

SINOTOOLS is a leading hand tools supplier and manufacturer in China. We aim to provide hand tools of the utmost quality that are worth our customers’ money. We continuously work on innovation and research to develop products that can bring a kind of revolution in the hand tool industry.

SINOTOOLS is known as one of the reputed hand tools suppliers that provides the broadest range of hand tools in China. Our extensive range of products includes Spanners, Pliers, Hammers, Sockets, Screwdrivers, Tool Kits, Power tools, etc.

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