Sharpening masonry drills

[Natlek]

I can sharpen free hand HSS drill very well , but I can t sharpen this masonry tipe drills . I make some knives from HSS steel and drilling hole is nightmare . I've ruined a few very good drill bits with tungsten carbide tip , just because I could not sharpen them properly .The sharpening surface is very small and it is difficult / at least to me / to sharpen them . Now I got a diamond sharpening stone and .................. miracle I made some holder for masonry drill , fixed it in my tool for sharpening knife and I sharpen both side . I do not even know in what angle I did .And I try to drill in 68 Hrc HSS You will not believe it............... this cheap masonry drill bits drill in HSS like HSS Cobalt one in wood !!!!!!!! And FAST !! With one I managed to drill three perfectly hole ! Sorry for the image of tool , the background a little annoying to see better what I done

 

[Ken H>]

I sorta see what you've done, but don't fully understand. Are you sharpening back to factory new angles? BUT - the diamond stone puts a sharp edge? I've used that type of drill bit to drill hardened steel, but didn't put a really sharp edge on it.

 

[kuraki]

He made a drill holder to use his file guide with diamond stones, great idea. Sharpening masonry bits at 135 degrees included with 2-3 degree relief angle is about perfect.

 

[Natlek]

He made a drill holder to use his file guide with diamond stones, great idea. Sharpening masonry bits at 135 degrees included with 2-3 degree relief angle is about perfect.

Yes , and it works excellent guys . I was out of country for two weeks for New Year and I have chance to bye real one tungsten carbide drill . So far I try one in file and it drill hole like in my finger They are no cheap but now I have reference for sharpening ....cheap one

 

[Natlek]

Well guys , now I can recommend them ............... 3mm. HSS steel , 4mm hole drill on 600 RPM . Easy !

 

[Geoff Flato]

If you find the similarly priced "glass and tile" bits, they come pre sharpened. I use them for mammoth tooth, and other times I don't feel like taking the risk of ruining a $30 hiroc drill.