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We never really think about drill bits ... until one snaps, or we don't have the size we need, or we have so other need for hole drilling. Then, drill bits become indispensable. In this article we provide more background on drill bits than what we could provide in the 5 minute video shown here. I am always amazed at how much information there is on seemingly in smaller topics like drill bits.
Lets start off with the most common drill bits, and the ones that have been around for 150 years or so, the common twist bit. Pretty much everyone who ones any kind of a drill, battery operated or drill press will have some selection of these. They are good for both wood and metal and even work ok in some plastics. They are typically inexpensive and last fairly well, and if you have a means to sharpen, they will probably last you a lifetime. Typically made from High Speed Steel they hold an edge well unless you really heat them up drilling holes, then they loose their temper and become dull. At this point you can sharpen them but they will not hold that edge long because the temper has been taken away from them.
For the purpose of this article, we will say there are 2 kinds of twist bits, the blue or black ones which are often coated with something to help the bit from rusting and the so called titanium bits, which are coated with titanium nitride, which is essentially a ground ceramic that helps the drill bit retain sharpness on the very tip of the bit. Otherwise the titanium has very little effect.