VEVOR Drill Bits Sharpener, 3-13mm Drill Bits Grinder Sharpener, Lip Relief Angle & 95°-135° Point Angle Adjustable Drill Bit Re-Sharpener, Portable Sharpening Machine with 11 Collets, CBN & SDC Wheel

I have purchased the MR-13B model. It is cheaper on Amazon than model A and it is better in my opinion. There are several YouTube videos, describing both models in detail. Somehow you led to believe that model A splits the point and model B just thins the web. This is not true. Model B in my opinion is an improvement over model A. It allows you to achieve a true split point and has several ways of doing it. I am not going to write about every detail, but will concentrate on staff, which is not well described and is important in my opinion.This little machine is well engineered and constructed. It weighs 17.7 lb with collets, chuck and grinding wheel. There is no plastic anywhere except some electrical parts. The power supply is 120 VAC, 60 Hz. The cable can be separated from the unit. Electric part is very simple - there are a power receptacle, switch, rectifier bridge and a 110 VDC motor. There is no other electronics in the unit, so it has to be reliable. All parts are mounted on a 7 mm thick steel plate. They are steel (no aluminum here), machined and ground where necessary. That is how you achieve the accuracy needed for drill sharpening.For sharpening you have to setup each drill in the setup station at the left side of the machine. You use a chuck and a collet of the appropriate size. The collets are standard ER20 for sizes above 5 mm. For smaller sizes the collets are modified to include an extended nose and relieved bore. Drills smaller than 4 mm are very difficult to setup properly in this station and I would recommend to do a visual setup or just grind them by hand. The chuck has 2 bearings to reduce the collet clamping torqueOnce your drill is setup in the chuck you move it to a sharpening station, where you sharpen both lips by rotating the chuck back and force. This station has a bearing as well for easy rotation. If you want to split the point after sharpening, move your chuck to the top station and again rotate the chuck left and right. This operation is adjustable for the depth and width of the cut. The produced split point looks somewhat different from factory drills, but works the same way. The difference is because this machine uses just one wheel for sharpening and point splitting. The finished drill has 4 distinct cutting edges, just like the factory split points.This machine comes with CBN and diamond wheels, model A includes only CBN wheel The wheel is steel with plated layer of CBN or diamond grit. On the attached pictures I show the diamond wheel. It is 3" in diameter, 10 mm wide and has approximately 1/2" bore. The wheel is clamped to the adapter, which is attached to the motor shaft by 3 set screws. I have only tried the CBN wheel for HSS drills. It cuts very aggressively, but leaves an acceptable finish for bigger drills. For small drills you better find a different way of sharpening.Overall my level of satisfaction with this machine is very high. I am getting good drill grinds and nice split points. But don't fool yourself into thinking that it will do the grinding for you. You need to know what a good grind looks like and adjust the machine accordingly.

What an amazing item. I have never found a bit sharpener that worked 100% as good as this one. IM SO IMPRESSED!! I sharpened 40 bits my first go and randomly picked out 12 bits after being sharpened and everyone of them cut like butter. Fast and so easy to use.Also this product came 2 days early, in which impressed me too. I give this a 5.5 star rating.

Brilliant!I’ve been searching for a better way to maintain sharp bits and this is the perfect tool for the job. Do not hesitate to purchase this sharpener. It will pay for itself with fewer bit replacement purchases. It’s burly and durable. It’s easy to set up and use — there are plenty of short YouTube videos describing the collet use. It’s fairly quiet. The dust extraction is okay but I simply set up on a foldable table outside. Keep the collets coated in WD-40 or your favorite oil for storage.

Positively one of the best purchases I've made to date on amz. Solid and well built, super heavy but small, all in one , 3 step drill (bit) workstation. Directions- spare and minimalist but you tube explains if any questions. Didn't know why I was doing the 1st step, just did it with Pro results first try. Light years ahead of the dirt doctor with no crummy plastic parts. Solid pro feel and even has a fan inside. Maybe to blow the dust away as it sharpens, it certainly blew me away.. Incredibly accurate if you read up a little on drill bit sharpening, and gives a factory finish when you're done, but who cares what it looks like. I was more taken aback with the dramatic performance difference after resurrecting my milwaukee drill bits presumed dead . Case in point, used a not so used Milwaukee 3/8 standard 116 deg drill bit that could not make a dent in a piece of hard metal that needed 2 holes deeper than a step bit, even pushed down with excess force and still no progress. So, it was high time to finally get a drill sharpener. 1st heard about this 'vevor' on a video from a very intelligent machinist, and although I was dubious thinking someone paid him off, took the gamble anyway and purchased. Influenced no, convinced yes. 1st thing i did was run this quality but dead dull throwaway drill bit thru the vevor, taking all but 2 min, skeptical still until I placed it in the drill and watched it chew right on thru that metal like a rabid dog hungry for more, producing a continuous metal shaving like you'd see with wood, Not metal. It was effortless, ez on the drill and once it started it still chewed on thru with just the weight of the drill. I'm convinced these bits weren't even this good when 1st used brand new from the factory.Bottom line: No more wasting of quality drill bits gone dull after 1 or 2 hard uses.