Drill Doctor DD350X Drill Bit Sharpener – 3/32″ to 1/2″ – Electric Sharpener – High Speed & Portable – for Steel, Masonry, Carbide & Tin-Coated Bits

Works great after you learn how to use it. First insert bit tightened just enough to hold it in the chuck. Make sure the alignment fingers in the chuck on both sides are against the edges of the bit flutes and again, on both sides. Align the white triangle with the cam guide and push bit into machine firmly. Then tighten chuck as much as you can, remove and tighten more. The tip of the bit should be sticking out no more than about 3/16″. If it’s sticking out more, redo the above. Turn the machine on and line up the straight line mark on the chuck with the cam guide on the machine. Now, this is IMPORTANT! Keep mild pressure UPWARD AGAINST THE CAM GUIDE as you turn the chuck to the right or clockwise to the double line mark on the chuck. Turn chuck to the right to the single line and again, keeping mild upward pressure on the chuck against the cam guide. Keep going from single line mark to double line mark and back again until the grinding of the bit sounds mild, smooth and uniform or just follow the guidelines in the instruction booklet. Also don’t worry about pushing down on the chuck, just let the grinding wheel do it’s job and AGAIN, keeping mild pressure UP against the cam guide.All this sounds somewhat complicated but once you get the drill down, (no pun intended), it’s about as easy as operating a pencil sharpener. I sharpened around 120 extremely dull bits that thankfully I had saved instead of pitching them. To test some of the bits that before sharpening could barely cut into wood, I tried drilling the sharpened bits into mild steel and they cut into it like butter. Good job Drilldocter!I would have given this DD350X sharpener 5 stars as this is advertised to sharpen bits down to 3/32″ but the alignment fingers in the chuck in my example seem slightly out of alignment and won’t clamp on to the tiny bit flutes of 3/32″ bits. Even so, I highly recommend this bit sharpener.