![]() ![]() The length of the drill bit has a significant influence on this, with a longer shaft being more breakable, while shorter ones are stronger. Their cobalt content makes them more brittle, which means they are prone to snapping under pressure. What are cobalt drill bits Cobalt bits are a combination of steel (or another alloy) mixed with a small percentage of cobalt, typically between 5 7. This isn’t to say that cobalt drill bits are without flaws. Please review the attached file for complete directions regarding the sharpening of DEWALT self-feed bits. ![]() Metal becomes blunt far more quickly when it is hot, so preventing it from overheating will make a significant difference to its durability. (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. M35 refers to 5% cobalt, whereas M42 has the highest cobalt content at 8%.Ĭobalt is strong and heat-resistant, so it is ideal for coping with the demands of drilling through iron, steel, and even titanium. 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. Once you do this once it is very easy and quick to touch up the facets to resharpen the bit. These bits are graded as M35 or M42 depending on how much cobalt they contain. The method I use to sharpen twist drill bits every day in the workshop. Cobalt Drill Bit M35 and M42 Cobalt Drill Bits Cobalt drill bits are not made from pure cobalt. Steps 5-7 are simultaneous meant to get you to the finish position. Cobalt drill bits are harder than the regular HSS (high-speed steel) drill bits and can be sharpened relatively easily with cutting fluid while retaining their strength and durability. Ensure you use at least steps 5-7 to make some moves with the bit across the belt towards the finishing position. Position one end of the landing in such a way that it directly faces against the belt. How to Choose the Best Cobalt Drill BitĬobalt drill bits are made of a steel alloy that contains at least 5% to 8% cobalt. At an angle of 60 degrees, hold your step drill facing the belt sander sharpener. ![]()
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