Drills are handy tools that are widely used in almost all industrial and DIY applications to create holes, almost always,of circular cross-section. Drill bits, on the other hand, are the accessories attached to the drill in order to perform this task. However, to ensure that you do not destroy the material you are drilling into, it is imperative that you use the correct drill bit for the said task.
The following is a comprehensive list of the most common drill bits and their uses.
The 402 mandrel is used primarily with cut-off wheels but is used with the following Dremel accessories: 409, 411, 412, 413, 420, 423, 425, 426, 456, 511, 512, 540 and 541
Used primarily with Dremel polishing bits and accessories
For use in all Dremel rotary tools
1/8 In. shank
1. HIGH-SPEED STEEL
High-speed steel (HSS) is one of the most commonly utilized materials in the manufacture of drill bits. It is suitable for drilling wood, plastic, and soft metals. High-speed steel bits are made from carbon steel with chromium and vanadium additives.
Thanks to cobalt’s immense structural strength, cobalt drill bits are especially adept at drilling through stainless steel and other tough materials. Cobalt alloys have an exceptional ability to withstand heat and resistance. Sometimes, these drill bits consist of an alloy of cobalt and HSS. Such an alloy guarantees you a bit that can go through just about any surface.
MATERIALS & COATINGS OF DRILL BITS
There are numerous types of drill bits in the market based in their construct as well as area of application. To help you understand this better, we shall first discuss the construction of different bits:
Drill bits are made from different materials to suit their purpose. Using the right bit material enhances your efficiency. It also saves money, purchasing a drill bit that cannot handle your project.
While almost all bits are made from metal due to its toughness, the difference comes in the metal composition. The following are some common materials used in drill bits.
Carbides are one of the strongest substances on the planet. In fact, some carbides rival diamonds for the hardest material known to man. They are formed when carbon is combined with metal. Nonetheless, carbide is extremely expensive. As a result, it would not be feasible to make an entire bit out of the substance.
This is why manufacturers prefer making only the tips out of carbide. Carbide-tipped bits are typically used for masonry, tile, and concrete drilling.
4. SOLID CARBIDE
When handling projects involving extremely tough materials, it would be a good idea to consider solid carbide bits. Unlike carbide-tipped bits, solid carbide bits consist entirely out of carbide.
You can also classify drill bits according to the coating they have which include:
- Black Oxide: helps the bit to retain lubricants to prevent the onset of rust.
- TiN Coated: TiN refers to titanium nitrate, which slows the progression of wear on bits that drill hard metals
- TiAIN Coated: titanium aluminum nitrate coating increases a bit’s resistance to abrasion and heat
- SG Coated: a silicone multilayer that helps a drill bit to penetrate dense metals.