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There is nothing more annoying than trying to drill some accurate holes in a project and having the holes all ragged, or even worse, having them off centre because the drill bit is dull. I'm always amazed at home many times we drill holes in things, no wonder manufacturers are always coming out with newer and better corded and cordless drills ( and drill presses too). Woodworkers are a lucky bunch, we can use almost any drill bit to drill wood and most will at least do an acceptable job ... that is ... if they are sharp.
Of course the most common drill bit is the simple twist bit. Certainly it is not the oldest type of bit, in fact it really only came along with the introduction of powered tools to drive a bit of this design. Prior to power drills we had to use braces and similar tools with auger and spoon bits to drill holes. But twist bits remain the most common, though not always the most ideal for the job ... but none the less, the most common because they can drill wood, metal and plastics. Other bits like auger bits, Brad point tipped bits and forstner bits are pretty much only for wood.
There have been tools and jigs around for many years that can be used to sharpen twist bits, but we have not found any that are easy and convenient to use. To sharpen twist bits you really need a dedicated machine, and thats precisely what Drill Doctor has done. They have introduced a line of sharpening tools that will sharpen a long list of twist bits and some Drill Doctor tools will even Masonry bits.
The Drill Doctors are easy to use and will produce consistent results of sharp drill bits. If you find that the diamond grinding grit wheel in your unit is becoming warn, it is easily replaced with either a 100 grit or 180 grit wheel for finer grinding points.