Drillng With a Drill Bits

08 Feb 2018 08:18
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There are many ways to drill a hole in something. Still drilling with a drill bit is most known. Manufacturers offer many types, shapes, materials, sizes of drilling bits. In order to create holes tools are usually attached to a power drill to cut through the material by rotation. You can drill soft materials with most any drilling bit, but brittle materials require specially designed tools. Some bits are dangerous to use with handheld drills and require a drilling press. Others are easy enough to use with hand or even hand-powered drills.

Coatings help prevent rust, lessen friction and wear. ZiN - Zirconium nitride film adds the strength, decreases friction and improve heat removal. Titanium coating is strong, adds corrosion resistance. Titanium has a high heat limit and an excellent fatigue limit, similar to steel, but somewhat less on both counts.

Conical point with a flat surface and linear chisel are used to improve cutting process, removing chips, and reducing thrust. In automated drilling machines are used multi-faceted drill points. Compared to usual bits, they require only a half of the thrust, and generate more then twice less heat.

Most of the drill bits have 118° drill points. They work well for cutting into copper, aluminum, and mild steel, whereas the 135° drill point is good for stainless steel, hardened steel and another tough materials. A 135° bit is flatter, therefore more of its cutting lips start to perform the full metal cutting action.

The material of the drill bit is important aspect of the tool selection. Not all bits will work on all applications. Low carbon steel is soft and dulls quick when drilling hard metals, but they cut wood great. High carbon steel hold cutting edge longer, require less sharpening, and can be used with tough steel. They can cut both woods and metals. High Speed Steel (HSS) is a special type of carbon steel that can withstand high temperatures. High speed drilling causes heating and temperatures can raise dramatically, but high speed steel can undergo it. Tungsten carbide alloys are tough, but brittle and more expensive. Carbide bits are used to drill concrete and tough steel.

Any master working with a sheet metal, boxes or thin mild metal has a Step drill bit (Unibit). They work at a faster speed to make relatively clean holes. Unibits come with as one single drill bit that have progressively sized grooves and ridges. So you just need one tool for a variety of jobs. But you should avoid drill wood with unibit because the bits split the wood and the hole will be low-quality.

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