![]() ![]() Bright HSS bits are suitable for almost any work in non-hardened steel, don’t bother trying to find a set with a special coating. I have found that drill bits sold at Fastenal (can’t recall the brand) are of good quality, and they have a good selection in the shop - if they don’t have what you want there they will order whatever you want, but their prices can be a bit high. ![]() I have used a set of Hitachi drill bits and I was pleased with their performance, but they don’t seem to be very common. Don’t bother with Dewalt, they are awful (well, the type that says “High Helix Angle”). If you’re in the US you can find SKIL drill indexes at Lowes (my preference for affordable drill bits). Posted in Tool Hacks Tagged cutting, drill bit, flute, metalworking, rake, relief, sharpening, twist drill Post navigation may be just a guy messing around in his shop, but he’s got a wealth of machine shop knowledge and we always look forward to seeing what he’s working on, whether it’s a homemade fly cutter or a full-blown CNC machine. And as a bonus, knowing what the angles do allows you to customize a grind for a special job. Seeing how the flutes and the web are formed and how all the different angles interact to cut material and transport the swarf away is fascinating. Where ’s video shines is by explaining why a drill bit is shaped the way it is, which he does by fabricating a rudimentary twist drill bit from scratch. The reason this video is worth watching is not just that you get to learn how to sharpen your bits, although that’s an essential metalworker’s skill. So you might expect a video on sharpening drill bits to be somewhat irrelevant, but makes it work. Drill bits are so cheap that when one is too chowdered up to keep working, we generally just toss it out. ![]()
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