VEVOR Borenslijper, MR-13A boren slijpmachine 3-13 mm, 95 ° tot 135 ° punthoek, verstelbare boor herslijper, draagbare bits slijpmachine met 11 spantangen, CBN-wiel voor HSS

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.

E una macchina Spettacolare!Avevo visto le mille recensioni online della macchina e le mie aspettative erano alte, e devo dire che cio nonostante sono rimasto stupito di come affila le punte!!Una punta nuova non taglia bene come dopo essere stata affilata con questa affilatrice.La nuova versione arancione e a mio avviso molto piu bella della versione gialla che si vede in tutti i video di youtube.Direi che sono entusiasta di questa macchina e non posso che consigliarla.

Au final je suis ravi , machine de qualité , le travail est parfait . Les forêts n'y droit à une seconde vie .

Finally a sharpener that works. Great product

Sehr tolles Gerät. Gut verarbeitet und es macht was es soll ohne Probleme und es ist überhaupt nicht umständlich zu bedienen. Die Bohrer sind nach dem schliff wieder super scharf, habe das Bohreranschleifen auch in der Ausbildung gelernt aber bei zwischengrößen wie für Innengewinde ist es schwierig alles exakt hinzukriegen. Auf jeden Fall eine kaufempfehlung wenn man nachhaltig von seinen Bohrern was haben möchte.