DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

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The raised center point didn’t get in the way when we sharpened the edges of the bit point, but sharpening the center of the point was more challenging. However, we found that these durable bits, housed within their well-built hard plastic case, would make a great addition to a workshop. The Amoolo cobalt drill bits performed as well as some of the top name brands in our tests but cost a fraction of the price. They drilled smooth, clean holes, and the 135-degree split point was easy to align with the bench grinder for sharpening. It bears mentioning, however, that the kit only includes smaller bit sizes in 1/16-inch increments, which makes it ideal for crafting and detailed drilling. You don't have permission to access "http://www.homedepot.com/p/DEWALT-Cobalt-Alloy-Steel-Drill-Bit-Set-29-Piece-DD4069/203321667" on this server. Step drill bits offer the advantage of fast, clean precision drilling into thin metals without changing bits. Each of this set of three cobalt step drill bits is designed and engineered to drill up to 1,000 holes into 14-gauge steel. They feature a rapid strike tip for faster starting, elongated dual flutes to reduce heat buildup, and smaller step gradients for smoother drilling. When attempting to drill through a hard, smooth surface, having the right tip is crucial. Most cobalt drill bits have tips with stepped and split points that bite into the metal, which prevent the bit from sliding along the smooth surface. Shank

Read on to find out more about our shopping considerations and testing process. This guide will help you find the best cobalt drill bits for turning metal into Swiss cheese. After drilling the first round of test holes (or after the second round for some harder drill bits), we sharpened the ⅜-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. The Bosch cobalt drill bits offer a unique combination of structural features and extra-hard M42 alloy that make them a pleasure to work with. To test this product, we used a cordless drill and a drill press to highlight the difference between precision drill press work and handheld drilling. The cordless drill mostly worked well, but its variable-speed trigger made it more difficult to maintain a slow, precise speed for drilling steel.Still wondering if cobalt bits are the best tool for the job? Read on for answers to the most common questions about cobalt drill bits. Q. Can cobalt drill bits be sharpened? The Stroton cobalt drill bits featured a round shank with a low-profile stepped split point. They performed smoothly with or without center-punch starter guides. Unlike the more exaggerated pilot-style stepped points found on the DeWalt and Milwaukee bits that we tested, this design only stepped up a total of about 0.5 millimeters above the shoulders of the bit point, despite having more steps. Twist– The most common type of drill bit and ideal for drilling wood, plastic, and metals. They are generally made from HSS and are suited to general household DIY tasks, as well as professional applications like maintenance and engineering. 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. Tip Point You don't have permission to access "http://www.lowes.com/pd/DEWALT-14-Piece-Cobalt-Twist-Drill-Bit/50413714" on this server.

Whether drilling wood, masonry, acrylic, metal or any number of other materials, having the drill bit for the job will give you the ability to drill with confidence and accuracy. Some drill bit sets will offer a mix of bit type to cover all types of jobs from wood and metal through to masonry, with some also including more specific bit types such as flat wood drill bit or countersinks. Drill Bit Sets are used by professional electricians, builders, plumbers, roof installers, etc. and DIY enthusiasts. Electric Pressure Washers Petrol & Diesel Driven Pressure Washers Hot Pressure Washers Pressure Washer Accessories Detergents, Chemicals and Algicides Pressure Washer Spares Hoses & Accessories cobalt content prevents maintains a sharper cutting edge and delivers • 4x longer life, and also provides stability at high temperature when drilling tough materials The Milwaukee cobalt drill bit set exceeded our expectations in the stainless steel drilling test. While most of the other bits did a pretty good job, the Milwaukee bits bit into the stainless steel noticeably faster. The slightly elevated point, which is shorter and narrower than DeWalt’s, seemed to find a sweet spot that then allowed the rest of the cutting edge to follow.Drilling through steel, cast iron, and other metals produces tiny shards that can end up in skin or eyes, so make sure to wear protective gloves and safety glasses when working with cobalt drill bits. The kit includes #1, #4, and #9 step bits. The #1 bit drills from ⅛-inch to ½-inch holes, with step increments of 1/32 inch. The #4 bit makes holes 3/16 inch to ⅞ inch, in 1/16-inch increments. The #9 bit drills ⅞- to 1⅛-inch holes in 1/16-inch increments. The cobalt drill bits are supplied in a large tough case, ensure secure tool storage and durability and protection in various environments