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14 Things You Should Know About Cobalt High Speed Steel Drill Bit Sets | kobalt high-speed steel twist drill bit set

  • The drill bit shank is the part that fastens into the drill chuck; the part of the drill that grips and turns the bit. Shanks may be round (also known as “flat”), or shaped for improved grip. Round shanks work well in keyed chucks. In keyless chucks, like those on cordless drills, shaped shanks offer better grip and eliminate the bit slipping inside the chuck. The most popular-shaped drill bit shanks include 3-flat, which have three flat sides ground into an otherwise round shank, and six-sided hex shanks. - Source: Internet
  • Before deciding to purchase a set of cobalt drill bits, shoppers will want to make sure they know what they’re getting. While these bits can cut a variety of materials, they are specifically designed to cut through hard metals such as stainless steel, cast iron, and even titanium. Because cobalt alloy bits are more expensive than conventional drill bits, they aren’t economical options for drilling materials like wood or masonry. Before making a purchase, shoppers will want to make sure they’re buying the right drill bits for the job. - Source: Internet
  • Cobalt drill bits consist of steel with a small percentage of cobalt—the higher the percentage of cobalt, the more heat-resistant and durable the drill bits will be. The amount of cobalt in a drill bit varies. An M35-grade cobalt bit contains 5 percent cobalt, while an M42-grade cobalt bit contains 8 percent. The higher the grade, the more expensive the bit. - Source: Internet
  • In addition, be aware that drilling into hard metal requires a special technique to ensure that the bit cuts into the metal smoothly without overheating. Use a quality drilling lubricant with a high flash point. We used 3-in-1 oil for our tests. Also, drill at a slower speed with moderate downward pressure to avoid damaging expensive bits. The smallest bits can safely drill at about 3,000 rotations per minute (rpm), but larger bits should turn no faster than about 1,000 rpm. - Source: Internet
  • Most twist bits come in diameters ranging from 1/16 inch to 1/2 inch, creating holes corresponding with the diameter. Step bits, which are shaped more like a cone, can drill holes ranging in diameter from about 1/8 inch to 1/2 inch, with a maximum depth of 1/4 inch. For deeper holes, look to purchase a twist bit. - Source: Internet
  • We tested with an eye out for which drill bits might work especially well for specific metals, such as which ones may be best for stainless steel or best for cast iron. While the unique tips on the Milwaukee 15-piece set proved especially effective at drilling in stainless steel, all of these drill bits would do well boring clean holes into a variety of metals. With that in mind, we assigned awards for each product based more on its features rather than on specific metal uses. - Source: Internet
  • Cobalt step drill bits are designed to drill holes into sheet metal. With its cone-like shape, a step bit enlarges the hole as it moves through the sheet metal, allowing users to regulate a hole’s diameter. A step bit works with up to 1/4-inch-thick sheet metal. Those looking to drill at shallow depths through sheet metal will want to consider using a step bit. - Source: Internet
  • Countersink drill bits create shallow holes that allow the head of a fastener to sit flush with the material and are angled to match the tapered head of the fastener. Cobalt countersink bits will create countersink holes in hard metals. Unlike twist drill bits, which include self-piloting tips, countersink bits require an existing hole to drill into a material. To drill countersink holes, twist bits are needed to drill the initial hole, then countersink drill bits are used to create the countersink holes. - Source: Internet
  • Size also affects wear, and length negatively impacts durability. Long drill bits are not as durable as shorter bits due to the amount of torque needed to rotate longer bits. Shorter bits also resist twisting or spinning in the drill chuck better. - Source: Internet
  • Cobalt drill bits are made of a steel alloy of 5 percent to 8 percent cobalt. These powerful bits chew through cast iron, aluminum, and even stainless steel. We researched dozens of cobalt drill bit sets before testing the following picks. - Source: Internet
  • After drilling the first round of test holes (or after the second round for some harder drill bits), we sharpened the 3/8-inch bits with a bench grinder. We held the cutting edge to the wheel for 5 seconds on each cutting edge, once on the coarse grinding wheel and once on the fine wheel, making sure to maintain the 135-degree original tip angle. To evaluate how well the bits responded to resharpening, we drilled another round of three test holes for each bit in the scrap steel. - Source: Internet
  • Twist bits are general-purpose drill bits and are capable of drilling a variety of different materials. They have angled grooves that spiral around the drill shaft. The edges of these angles are sharp, allowing the bit to burrow into the material. Cobalt twist bits are strong enough to bore into hard metals quickly. They come in a wide variety of sizes, with sets including up to 30 pieces. - Source: Internet
  • Counterbore drill bits create holes that allow the head of a fastener to sit below the material’s surface. Unlike countersink bits, which create an angled hole for fasteners with angled heads, counterbore drill bits create a larger hole at a shallower depth. A counterbored hole creates a flat ridge on which the head of the fastener can rest. - Source: Internet
  • HSS drill bits, an acronym for high speed steel drill bits are extremely hardwearing and particularly well designed for drilling into metal surfaces, as they are much more resistant to the heat generated from the fast speed operation. The front edges cut the material, whilst the spirals remove debris from the hole. Light pressure should be applied when using smaller bits to prevent them from breaking. HSS bits can be also be used for drilling wood and plastic materials. - Source: Internet
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