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Thread: Grinding a large drill bit - GIF

  1. #1
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    Altair's Avatar
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    Grinding a large drill bit - GIF

    Grinding a large drill bit.




    Previously:

    Drill bit sharpening jig - video
    Drill bit sharpener - video
    Circular saw blade sharpening machine - GIF

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  2. The Following 7 Users Say Thank You to Altair For This Useful Post:

    baja (Feb 17, 2021), desbromilow (Feb 15, 2021), Home-PC (Feb 15, 2021), jimfols (Feb 23, 2021), mwmkravchenko (Feb 16, 2021), NortonDommi (Feb 16, 2021), Toolmaker51 (Feb 15, 2021)

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    Supporting Member Floradawg's Avatar
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    I grind mine from the leading (cutting) edge. I guess you grind that one how ever you can hold it.
    Stupid is forever, ignorance can be fixed.

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    Toolmaker51 (Feb 15, 2021)

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    Supporting Member Skun Knuckles's Avatar
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    That doesn’t look right on so many levels.

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    Quote Originally Posted by Floradawg View Post
    I grind mine from the leading (cutting) edge. I guess you grind that one how ever you can hold it.
    Yeah. On a disk sander. Very straight cutting edge, control of included angle, and limited heat.
    So where is the grinding gauge, unless he is just removing bad material prior true grinding. I won't envision the load on machine or part from unbalanced cutter profile.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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    Supporting Member NortonDommi's Avatar
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    Like Skun Knuckles,(love your handle mate!), I thought that doesn't look right then I realised he is probably 'dubbing' the angles to put more pressure on the central part of the cutting edge.
    I hand sharpen using a variety of methods while I'm still capable and have found that the method demonstrated here:
    at Tom's Techniques is very quick and does a great job on the majority of sizes I use. It is also one of the easiest to teach someone else how to sharpen a bit and have success.

    I like to use Secondary Point Angles,(SPA),on anything above say 1/4"/6 mm as described on page 2 of this excellent article from Newman Tools. It certainly makes a difference in bit use before a resharpen.
    Drill_Point_Geometry_nt.pdf

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    Floradawg (Feb 16, 2021), jimfols (Feb 20, 2021), Toolmaker51 (Feb 16, 2021)

  9. #6
    Supporting Member Floradawg's Avatar
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    Great job of explaining the proper technique. I usually roll the drill to attempt to replicate a factory shape but it is probably easier and a better result obtained your way. I will use your method next time I need to hand sharpen a twist drill.
    Stupid is forever, ignorance can be fixed.

  10. #7

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    I don't think I could lift that drill let alone grind it. Defiantly prefer core drills.



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