2.1 Drill bits for Universal Workpiecesĭrill bits that fall under this subcategory are suitable for all materials. Below are the different drill bit types under each subcategory and their applications. Under this category, we have four common subcategories: universal, metal, wood, and others. Many types of drill bits are categorized based on the materials they can make holes. Category#2: Types of Drill Bits for Different Workpiece Also, they are highly accurate and suitable for materials such as glass, sea glass, etc. Consequently, they are suitable for drilling into hard materials such as metals. Due to the lowered friction, drilling becomes easier.īlack oxide drill bits are suitable for drilling steel, PVC, acrylic, maple, nylon, etc., and are considered the best general-purpose drill bits.ĭrill bits coated in diamonds have the highest hardiness in this category. They make the drill bits heat-resistant, rust and corrosion-resistant, and frictionless. However, they are not suitable for drilling aluminum.īlack oxide is an inexpensive coating applied on high-speed steel. As a result, they are majorly applicable in drilling through hard materials.ĭrill bits coated with titanium aluminum have high stability and suitability for drilling stainless steel, steel, and other materials at high temperatures. Consequently, they are slippery with a characteristic blue or purple color. These drill bits are similar to the titanium nitride drill bits. However, the only disadvantage is that it is not restorable when they lose its cutting edge unless the coating is reapplied. Due to their properties, they have wide industrial applications. Below are the types of drill bits that fall under this category.ĭrill bits coated with titanium nitride are hard, fast, have a longer lifespan, and are suitable for drilling hard and soft metal. Category #1: Types of Coating Drill BitsĬoatings are materials applied on a part to give it better functional or aesthetic value and are one of the main categories of drilling bits. Below is an introduction to the different drill bits that make up each category. Neck: The neck connects the shank and the body.ĭifferent types of drill bits are used in part manufacturing and are classified into two main categories: coating and workpiece materials.Web: The part separating the two flutes.It functions by reducing the friction between the drill and the hole. Body Clearance: This is part of the body with a lesser diameter than the drill bit.
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