![]() I may experiment but don't want my bits to shatter. HSS Cobalt Drill Bit Set 1 13mm in Sturdy Index Case. Abrasive material A standard grinding stone can sharpen steel and cobalt drill bits, but you will need a diamond wheel for carbide bits. I did find some instructions on heating the end to brown/purple followed by water quench & another heat to dull red followed by water quench the re heat to dull red and slow cool - don't know if this is for HSS though. High Speed Steel Drill Bits 1 - 13mm in 0.5mm increments Supplied in a sturdy plastic Drill Index. Versatility Drill bits require different angles for different purposes. This takes time, and I thought if I could harden the cutting edge I could get more depth. Abrasive material A standard grinding stone can sharpen steel and cobalt drill bits, but you will need a diamond wheel for carbide bits. Homeowners can sharpen their drill bits at home using a variety of tools, including a hand-held file, a bench grinder. Of course I then attempt pushing harder and spinning the drill as fast as it will go and probably work harden the started hole - I since have found out I should have stopped right away and re sharpened. I think I am now out near the thin section of the flat head bolt and it is harder. ![]() When I continue with either a 1/2 or 9/16 they will just start to cut then just ride on the steel. ![]() I started out with a bit the same size as the hex socket straight through the bolt followed by a 3/8 bit. My problem is drilling through the bolt head with a 9/16 bit to separate the head from the bolt shaft. Once you do this once it is very easy and quick to touch up the facets to resharpen the bit. I sharpen to a 135 degree point and can set it anywhere from 118 to 140. The method I use to sharpen twist drill bits every day in the workshop. Drill Bit Sharpeners Filters Sold In Stores No stores within 100 miles Find a Store Brand Drill Doctor (7) Price Min Min to Max Max Below 100.00 (5) 100.00 - 200.00 (2) 200.00 - 300.00 (0) 300.00 - 400.00 (0) 400.00 - 500.00 (0) Customer Ratings (2) (5) Min. EJ 4 Spiral Groove Pagoda Bits 12 Hexagonal Shank 20 Triangular Shank 32 Step. I'm using a Darex V390 it will split point. Wholesale cobalt drill bit sharpener from China cobalt drill bit sharpener. ![]()
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