In CNC machining, drill bits are essential cutting tools primarily used for creating holes in workpieces. Among various types (e.g., center drills, twist drills, deep-hole drills), the Twist Drill stands out for its versatility and efficiency.

Structure & Features

A twist drill consists of three key parts: Point, Body, and Shank.

Point: Typically angled at 118° or 135°, it initiates material penetration. Geometry affects accuracy and performance.

Body: Helical flutes facilitate chip evacuation and coolant flow, reducing heat buildup.

Shank: Either straight or tapered (e.g., Morse taper) for secure clamping.

Common materials include High-Speed Steel (HSS) and Carbide, with the latter offering superior wear resistance for hard metals like stainless steel.

Advantages

Wide Compatibility: Suitable for metals, plastics, and wood.

Efficient Chip Removal: Spiral design prevents clogging.

Cost-Effective: More affordable than specialized drills.

Usage Tips

Speed & Feed: Adjust parameters based on material to avoid overheating.

Sharpening: Dull bits degrade performance; regular maintenance is crucial.

In summary, twist drills are indispensable in CNC operations. Proper selection and handling ensure optimal productivity.