That's normal and requires a lot of patience. It may take a couple dozen times to get the two lips of the drill bit symmetric. For this reason, it is especially important to create a very small chisel. In fact, while the drill is turning and being forced down into your work-piece, the chisel smears the wood or metal you are drilling into the lips. In truth, this area does no cutting motion. The "chisel" is the line which is created when the landing from both sides of the twist drill intersect. However, too much angle subtracts support from the lip, and will cause the bit to chip more often, especially on the corners. The landing must be angled in such a way that it leaves clearance between the part you are trying to drill and the lip. The "land" or "landing" is what follows the lip and will support the sharp edge while the bit is cutting. This is bad as it makes non-straight holes. If one lip is favored while sharpening, it will become bigger than the other and most of the cutting will be performed on one side of the bit. The two lips on the twist drill should be symmetric if an equal cutting is to be done while drilling. The "lip" is what does the actual cutting. For speed sake, were only worried about 3 basic features on the bit: the lip, land, and chisel. There are many features on a drill bit that can be defined. And you should probably wear safety glasses too. Be mindful and deliberate about where you position yourself on the sharpening device. DO NOT wear gloves as they can actually get caught into the sharpening device and pull you in. WARNING! Your hands will be very close to the sharpening device, and dangerously at risk with losing some skin. So without further adieu, here's what you’ll need: My trainer and I have gotten so good, in fact, that whenever we’re given those cheap HSS China bits (that pretty much everyone has in their garage), we’ll pull them right out of the box and sharpen them before their first use. Now, I’m not saying that after this tutorial, you’ll be able to achieve a perfectly sharp drill bit, but it will get you through the next job until you get enough practice to really put an edge on your cutting tools. So what’s going to be demonstrated here is a kind of lost art-sharpening by hand on a belt sander or bench grinder. In fact, you’ll notice that most of those fixturing devices or machines cost a lot of money, and very rarely do they ever give you something close to a factory sharpen (unless of course you fork out enough to buy an industrial sharpener). When I started my job as a machinist nine years ago, my trainer was skeptical about using any kind of automatic machine or fixture to re-sharpen our drill bits. Well before you head over to the hardware store to buy yourself a brand new box of drill bits, try this simple technique first and save yourself a lot of time and money!įollow these steps and you can transform your used, dull, chipped, broken, or otherwise useless drill bit, into a prime hole blasting instrument.
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