Ok

Nothing to dislike

Es dificil de usar, creo que el diseño de no es el mejor ya que no es posible suajetar adecuamente la broca no hay espacio sufiente, la idea es buena mas no la herramienta.

Excelente todo

It’s hard to say how this works, as there are not instructions. Each sharpener comes with a curved piece of plastic that has no obvious use and no obvious place on the device. I may try to use them at some point but it may be a dicey experiment, given I don’t know how it is supposed to be done

A poorly engineered contraption that arrives without any instructions and is hardly intuitive. The seller gives no indication of optimum drill direction or speed or bit pressure on the wheel. So you are on your own here. The contraptions contain no bearings, only unlubricated sleeves. When it arrived, the shaft was difficult to turn and binding. There is a nut that apparently is to tighten the grinding wheel to the shaft, but it arrived loose and the grinding wheel was simply spinning on the shaft. When tightened, it seemed to make the shaft, already spinning with considerable resistance, spin even more tightly. Some bike chain lube seemed to help. In operation, the plastic devices incorporate approximately sized channels approaching the grinding wheel at the correct angle in which you place the drill bits, while spinning the shaft in a drill. Using your thumb to slide the bit against the spinning grinding wheel is intended to accomplish the task of sharpening the drill bit. In practice, it's difficult to keep the drill bit from jumping from the channel while sharpening, and when it jumps, it screws up the blade angle and you dull the drill. But worse, much worse than all of the above, the drill ended up duller after 10 minutes of "sharpening" than when I began. Buy at your own risk.

Cant believe I've lived this long without this! Coolest most useful $5 of my life. Removed one star because the description shows two sharpeners with wheels installed and 2 extra wheels, but that is NOT what you get.. the sharpener +2 wheels, refers to the wheels installed, not 2 replacements. its obviously and deliberately misleadingVery lightweight, so it's not hard to use (one hand on the drill one holding the bit in the slot). Connect it to the drill, with the drill set to forward/clockwise/righty-tighty. Hold it in your dominant hand just like a cell phone, with the slots up, where your screen would be. Use your thumb, just like you would to swipe up your screen to gently slide the bit up to the stone, and rotate into position. ( see images)Couple tips: you want high speed turning and very minimal pressure so you dont remove too much material and it doesnt slide around in the slot. It sharpens very fast, especially on thin bits, 2 seconds per side or less, or you'll remove too much material.Use your head. Turn the drill bit in the slot until the edge of the drill tip meets right up to the stone.. a light colored background like the white paint can in my photo will help you see if it is lines up correctly.. if you look at the close up images you will see one that is lined up, ready to sharpen, you cant see any gap. and one where you can see space between the grinding wheel and drill tip that needs to be rotated before you start grinding. Be aware that some manufacturers use 135* bevel ( Milwaukee) and some use 118* (ryobi). I forget which this is, but if your bit is the other, you will have a space no matter what, just line up as close as you can get to no gap. Its perfectly find to grind the new angle.You want to sharpen both sides equally so the high point is near the center otherwise all your holes will be off center. The first time I used it, I ground way too much material (only took about 5 seconds) and the tip looked more like a chisel than a point ( i illustrate this error in the final picture), which made it a little difficult to get the opposite bevel (that I had ground off completely) lined up and get the point back to center.. just take your time. Easier to sharpen each side twice than fix it if you grind off the opposing bevel.Pretty simple.. attach drill, put bit in correct slot for its size. With your magnification glasses on, rotate the drill bit until there is no gap (or as little as possible) visible between the drum and tip, and with the two just barely touching (dont push hard up against the wheel) squeeze trigger. Rotate 180 degree and repeat.It also used it put a new tip on a broken bit.I know drill bits are cheap, but I'm sick and tired of not have a sharp bit in the size I want when I need it despite having a dozen sets, or thinking I have a sharp one only to have to test 3 or 4 to find one that works. Dull is relative. A bit may easily go through soft wood or sheetrock, but no way would it go through sheet metal.. you think you put back a bit that is reasonably sharp only to find out when you need it you were wrong. No one wants to make an extra trip to the hardware store.. now I dont have to! Instructions say to use only on black oxide bits, and avoid harder metals but it sharpened my 3/16 titanium no problem. Granted 3/16 is very small and I used it gently.. YMMV.It will NOT sharpen spade bits, or masonry bits.

So this will supposedly work for smaller bits but it does not. It's impossible to hold the right angle. I did not try any larger bits As of yet but I'm assuming it will be easier to use larger bits.This concept is simple. You're not doing a machine finish obviously you're just touching it up in the field. I used to use an angle grinder For this. So would probably be a little bit easier and safer than that.