You can sharpen cobalt bits many times before they become unusable. This gives them a longer lifespan, which saves you money over the long-term. They do not have a coating, so there is no surface stripping when sharpening them. SharpeningĬobalt bits are pretty easy to sharpen. The same tool can be used to sharpen high-speed, cobalt, and tin-coated drill bit types, but carbide tips require a sharpener with a diamond wheel. Due to its hardness and heat resistance, it can use to drill a wide range of materials such as steel, copper, wood, aluminum, etc. Black oxide drill bits are black in color, and it is made with HSS by coating a magnetite (Fe3O4) layer. The cobalt also prevents the bit from getting too hot as it spins against other metals.Ĭobalt bits have no coating at all, which differs from titanium drill bits. Black Oxide Drill Bits Your Budget Solution by Tom Mackenzy. Many bench grinders have two grinding wheels, one coarse one and one. (See the Ocean Penetrator Cobalt Drill Bit video to the left) The Ocean PENETRATOR COBALT Drill Bits arrive from the factory pre-sharpened to 170 degrees with a split point. Your goal is to remove only enough metal to get a sharpened edge. During testing this COBALT Structural Steel drill bit drilled 490 holes in 1 hour, and even after 500 holes was still drilling holes at less than 8 seconds per hole. This makes them extremely tough and able to go through the most rigid materials out there, like cast iron. How to Sharpen Drill Bits STEP 1 Examine your dull bits. They’re usually around 5% to 8% cobalt, with the rest being steel. They’re very tough bits, making them suitable when others just won’t do.Ĭobalt drill bits are made with a mixture of cobalt and steel alloy. However, they do contain a bit of cobalt, which is where they get their name from.ĭespite their primary use for metal, they can also be used for softer materials. They are not made of pure cobalt, which we will discuss in-depth shortly. Cobalt drill bits are designed for cutting through all sorts of metal, including stainless steel and cast iron. Drill bit sharpeners tested: Work Sharp Drill Doctor 750x, Chicago Electric (Harbor Freight), General Tools, Drill Master, Goodsmann, and Bosch.
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