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Sharpening Large Drill Bits

Discussion in 'The Tool Shed' started by Buildflycrash, Feb 11, 2019 at 9:10 PM.

  1. Feb 11, 2019 at 9:10 PM
    Buildflycrash

    Buildflycrash Member Sponsor

    Gulf Breeze FL...
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    I have a Drill Dr that works great but need a 3/4” bit sharpened. I tried on my bench grinder. I’ve watched YouTube videos. I just can’t seem to make it work.

    What’s the secret? What video am I missing?
     
  2. Feb 11, 2019 at 9:25 PM
    73 cj5

    73 cj5 Destroyer of Jeeps Sponsor

    Clinton, Mississippi
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    If you need some entertainment ave has a video on doing it with an angle grinder and cutoff wheel.
     
  3. Feb 11, 2019 at 9:52 PM
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    Hold the cutting edge against the flat side of the wheel, at the proper angle.

    Then as you grind, you kind of drop-and-rotate-up-and-out the lower end of the drill.

    This creates the vital relief angle behind the cutting edge. Don't rotate too far, or you'll ruin the opposite edge.

    Repeat equally on both edges. Generally speaking, close-enough will work okay.

    Do not let the steel get blue hot, or you will have ruined the temper
     
    Last edited: Feb 11, 2019 at 10:15 PM
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  4. Feb 11, 2019 at 9:58 PM
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    Get a cup of water to dip your bit in to cool it.
     
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  5. Feb 11, 2019 at 10:16 PM
    Dave B

    Dave B Frankenjeep '67

    Northern Minnesota
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    Don't know what you're missing, but the fellow in the video below covers the bases/elements. Of course, he's practiced. A homemade jig may be a useful "crutch", but that's another video without the help of this fellow talking you through the fundamentals. He's taking for granted that you have a good wheel properly dressed.
     
  6. Feb 11, 2019 at 10:18 PM
    Buildflycrash

    Buildflycrash Member Sponsor

    Gulf Breeze FL...
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    I got it to cut!! Making a separate relief angle and measuring the cutting edge to be sure that they are even seemed to be the keys for me.
     
  7. Feb 11, 2019 at 10:20 PM
    Buildflycrash

    Buildflycrash Member Sponsor

    Gulf Breeze FL...
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    That was the video that helped most.
     
  8. Feb 12, 2019 at 8:11 AM
    Dave B

    Dave B Frankenjeep '67

    Northern Minnesota
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  9. Feb 14, 2019 at 2:35 PM
    nickmil

    nickmil In mothballs. Sponsor

    Happy Valley, OR
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